No +12V on 7 way plug.

[PoorSpecRanger]

I have 2022 XL that came with out the factory tow package. Recently I installed the factory hitch , cut the hole in my bumper, and installed the factory 7 pin with correct harness. I plugged in the tester to make sure every thing was functional but there doesn't seem to be voltage on the +12 aux / charge pin. Every thing else signals , backup, and plate light all seem to work perfectly. I searched for a few minutes and found some threads related to this issue but not much info on how people resolved it. I'm planning on using a curt echo so I will definitely need the +12 pin. I put the vehicle in drive and went down the road with the tester plugged in with no change. Hopefully some one else has figured this out and can share some info. Does some thing need to be done to the computer to tell it I have a 7 pin now?

Sponsored

 

[mtbikernate]

many testers don't simulate a trailer being connected. a limited number do. the truck won't send 12v power until it detects a trailer connected, so you need one with this functionality. or a trailer.

 

[PoorSpecRanger]

Hmm I guess I'll have to buy the Curt Echo inline and just give it a shot to see if it powers on with a trailer connected. Its not so easy to test to see if that pin activates when I plug in a trailer. Looks like even the cheapest Chinese tester with load simulator is > $50.00.

 

[EJH]

mtbikernate is correct. I tried the same with a simple tester before I have my real TT. Only the brake, left and right signals lit up IIRC. You will know the 12v is energized because the truck's dash will display a message "Trailer connected" and then "Trailer disconnected". You will have to shift out of Park for the message to appear and the truck to power up the trailer control module.

 

[ControlNode]

I thought I read somewhere that you can force the 12V on by manually engaging tow/haul mode.

 

[airline tech]

I have 2022 XL that came with out the factory tow package. Recently I installed the factory hitch , cut the hole in my bumper, and installed the factory 7 pin with correct harness. I plugged in the tester to make sure every thing was functional but there doesn't seem to be voltage on the +12 aux / charge pin. Every thing else signals , backup, and plate light all seem to work perfectly. I searched for a few minutes and found some threads related to this issue but not much info on how people resolved it. I'm planning on using a curt echo so I will definitely need the +12 pin. I put the vehicle in drive and went down the road with the tester plugged in with no change. Hopefully some one else has figured this out and can share some info. Does some thing need to be done to the computer to tell it I have a 7 pin now?

FYI, the pic you posted does not match truck harness,
Disregard Pin #2, being listed twice (Below)
�

​ Connector: C4099​ Description​ TRAILER TOW CONNECTOR​ Color​ ​ Harness​ 13A576/15K868​ Base Part #​ part# N/A​ Service Pigtail​ Not Available​
​
[TR] [TD]​ ​

​

Terminal Part Number​	Service Part Number​	Size​
DU5T-14474-GBB	Not Available
DU5T-14474-TBB	Not Available
TBD-TERMINAL_F	Not Available
DU5T-14474-FBB	Not Available

Pin​	Circuit​	Gauge​	Circuit Function​	Qualifier​	Terminal Part Number​
1​	CAT28 (YE)​	16​	CTRL MOD. - TRAILER TOW # STOP/TURN LAMP LEFT​	​	DU5T-14474-GBB​
2​	RAT08 (WH)​	10​	CTRL MOD. - TRAILER TOW # RETURN​	​	DU5T-14474-TBB​
2​	RAT08 (WH)​	10​	CTRL MOD. - TRAILER TOW # RETURN​	​	TBD-TERMINAL_F​
3​	CAT19 (BU)​	10​	CTRL MOD. - TRAILER TOW # BRAKES​	​	DU5T-14474-FBB​
4​	CAT29 (GN)​	16​	CTRL MOD. - TRAILER TOW # STOP/TURN LAMP RIGHT​	​	DU5T-14474-GBB​
5​	CAT14 (OG)​	10​	RELAY - TRAILER TOW BATTERY CHARGING​	​	DU5T-14474-FBB​
6​	CAT11 (BN)​	14​	CTRL MOD. - TRAILER TOW # PARK LAMPS​	​	DU5T-14474-GBB​
7​	CAT03 (GY-BN)​	16​	CTRL MOD. - TRAILER TOW # BACKUP LAMPS​	​	DU5T-14474-GBB​
​	​	​	​	​	​

[/TD]
[/TR]

 

[PoorSpecRanger]

FYI, the pic you posted does not match truck harness,
Disregard Pin #2, being listed twice (Below)
�

​ Connector: C4099​ Description​ TRAILER TOW CONNECTOR​ Color​ ​ Harness​ 13A576/15K868​ Base Part #​ part# N/A​ Service Pigtail​ Not Available​
​
[TR] [TD]​ ​

​

Terminal Part Number​	Service Part Number​	Size​
DU5T-14474-GBB	Not Available
DU5T-14474-TBB	Not Available
TBD-TERMINAL_F	Not Available
DU5T-14474-FBB	Not Available

Pin​	Circuit​	Gauge​	Circuit Function​	Qualifier​	Terminal Part Number​
1​	CAT28 (YE)​	16​	CTRL MOD. - TRAILER TOW # STOP/TURN LAMP LEFT​	​	DU5T-14474-GBB​
2​	RAT08 (WH)​	10​	CTRL MOD. - TRAILER TOW # RETURN​	​	DU5T-14474-TBB​
2​	RAT08 (WH)​	10​	CTRL MOD. - TRAILER TOW # RETURN​	​	TBD-TERMINAL_F​
3​	CAT19 (BU)​	10​	CTRL MOD. - TRAILER TOW # BRAKES​	​	DU5T-14474-FBB​
4​	CAT29 (GN)​	16​	CTRL MOD. - TRAILER TOW # STOP/TURN LAMP RIGHT​	​	DU5T-14474-GBB​
5​	CAT14 (OG)​	10​	RELAY - TRAILER TOW BATTERY CHARGING​	​	DU5T-14474-FBB​
6​	CAT11 (BN)​	14​	CTRL MOD. - TRAILER TOW # PARK LAMPS​	​	DU5T-14474-GBB​
7​	CAT03 (GY-BN)​	16​	CTRL MOD. - TRAILER TOW # BACKUP LAMPS​	​	DU5T-14474-GBB​
​	​	​	​	​	​

[/TD]
[/TR]

I believe that's the plug that snaps onto the back of the oem 7 pin socket that you just posted there.

 

[BassRanger]

Non-tow package XL means you are going to have to run your own charge line. The non-tow Xls don't have the TBC harness or the trailer module.

Fortunately there is a free 12V harness under the bed. You will see a small pigtail on the driver side of the bed with nothing plugged into it. That is where I sourced power for my charge line.

 

[airline tech]

I believe that's the plug that snaps onto the back of the oem 7 pin socket that you just posted there.

I double checked, you are correct, my factory plug has a diagram on the cover, and it matches the pic you posted, the only difference is its actually installed 180 deg opposite of pic.
I attempted to locate what triggers the Charge + power.
There is no clear description on how the truck knows if the trailer is connected, however it appears it is looking at an extra load (resistance) on the exterior lighting circuit, mainly stop-lamps as a brake application for longer than 3 seconds (in the same ignition cycle) and trailer hooked up is required to activate the trailer charge circuit.
The check-out without trailer hooked up, uses a scan tool and commanding the internal relay inside of the (TRM) Trailer Module -(On) to activate power on that wire.

With my playing with Forscan, thus far have found it highly limited in bi-directional control for troubleshooting my Autel scan tool suffers from the same fate with the Ranger.
Ford limits non factory scan tools as to what functionality they have. So, I doubt this will be a function that Forscan will be able to do.

Now, to address the modules needed, as it is not clear either.
From my understanding all rangers come with the (TRM) - Trailer Module
A quick check would be pull your glovebox out and see if the (TRM) is installed.

now

The Trailer Brake Controller is an add on feature and is used for trailer brake control.


Trailer Lamps - Vehicles Not Equipped with a TRM

The BJB LH and RH trailer tow stop/turn relays supply voltage to the trailer tow stop/turn lamps when the vehicle stop or turn lamps are commanded on.

The BJB trailer tow park lamp relay supplies voltage to the trailer tow parking lamps when the vehicle parking are commanded on.

The BJB trailer tow reversing lamps relay supplies voltage to the trailer tow reversing lamps when the vehicle reversing are commanded on.

Trailer Lamps - Vehicles Equipped with a TRM

The TRM supplies voltage to the trailer tow stop/turn lamps when the vehicle stop or turn lamps are commanded on.

The BJB trailer tow park lamp relay supplies voltage to the trailer tow parking lamps when the vehicle parking are commanded on.

The BJB trailer tow reversing lamps relay supplies voltage to the trailer tow reversing lamps when the vehicle reversing are commanded on.

The TRM provides voltage to the trailer tow connector for trailer battery charging when all the following are true:

• the TRM detects that a trailer is connected
• the ignition is on and engine is running
• a brake pedal application has been detected in the present ignition cycle
• the BCM load shed strategy is not active (a message will be displayed in the instrument cluster, such as "Low Battery Features Temporarily Turned Off" or "Turn Power Off To Save Battery", to indicate that BCM load shed strategy is active)

The TRM directly (no relay) supplies fuse protected voltage for trailer battery charging.


Pinpoint Test for 12v Power

I know the manual wiring pinout sucks and is incorrect here, but the main point is triggering power to (Pin #4) on the pic you posted, Ford Manauls are not always correct

Refer to Wiring Diagrams Cell 95 for schematic and connector information. Normal Operation and Fault Conditions REFER to: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation) . REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation) . Possible Sources Fuse Wiring, terminals or connectors Trailer tow connector TRM Trailer concern Visual Inspection and Pre-checks Verify the BJB fuse 73 (30A) is OK. Inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow connector as required.

F1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR

Disconnect: Trailer. Ignition ON. Using a diagnostic scan tool, view the TRM Parameter Identifications (PIDs). Select the TRM Point Output Relay (PWR_PT_RLY) active command. Command the Power Point Output Relay active command ON. Measure: Connectors: Positive Lead Measurement / Action Negative Lead 7-Pin Connector, Pin 5 Ground Is the voltage greater than 11 volts? Yes The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.​ No GO to F2​

F2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (VEHICLE HARNESS)

Ignition OFF. Disconnect: Trailer Tow C4099 . Ignition ON. Using a diagnostic scan tool, view the TRM Parameter Identifications (PIDs). Select the TRM Point Output Relay (PWR_PT_RLY) active command. Command the Power Point Output Relay active command ON. Measure: Connectors: TRAILER TOW CONNECTOR Positive Lead Measurement / Action Negative Lead C4099-5 Ground

TRM - Location (Behind Glovebox) If you have this installed, then you have the TRM, note the (TCU -Not Shown) Telecommunications Unit will be covering most of the module up as it is mounted over it (If I recall correctly)
So there should be (2) modules located in that spot, one on top of the other

 

[Dgc333]

FWIW, I have a motorized jack on the front of the trailer that has a 7 pin connector on it with just the +12v and ground wires connected.

When I plug it in with the engine off there is no power. As soon as I start the truck I get power to run the jack but do not get the trailer connected message in the dash. I only get the message when the trailer is plugged in.

 

[PoorSpecRanger]

I double checked, you are correct, my factory plug has a diagram on the cover, and it matches the pic you posted, the only difference is its actually installed 180 deg opposite of pic.
I attempted to locate what triggers the Charge + power.
There is no clear description on how the truck knows if the trailer is connected, however it appears it is looking at an extra load (resistance) on the exterior lighting circuit, mainly stop-lamps as a brake application for longer than 3 seconds (in the same ignition cycle) and trailer hooked up is required to activate the trailer charge circuit.
The check-out without trailer hooked up, uses a scan tool and commanding the internal relay inside of the (TRM) Trailer Module -(On) to activate power on that wire.

With my playing with Forscan, thus far have found it highly limited in bi-directional control for troubleshooting my Autel scan tool suffers from the same fate with the Ranger.
Ford limits non factory scan tools as to what functionality they have. So, I doubt this will be a function that Forscan will be able to do.

Now, to address the modules needed, as it is not clear either.
From my understanding all rangers come with the (TRM) - Trailer Module
A quick check would be pull your glovebox out and see if the (TRM) is installed.

now

The Trailer Brake Controller is an add on feature and is used for trailer brake control.


Trailer Lamps - Vehicles Not Equipped with a TRM

The BJB LH and RH trailer tow stop/turn relays supply voltage to the trailer tow stop/turn lamps when the vehicle stop or turn lamps are commanded on.

The BJB trailer tow park lamp relay supplies voltage to the trailer tow parking lamps when the vehicle parking are commanded on.

The BJB trailer tow reversing lamps relay supplies voltage to the trailer tow reversing lamps when the vehicle reversing are commanded on.

Trailer Lamps - Vehicles Equipped with a TRM

The TRM supplies voltage to the trailer tow stop/turn lamps when the vehicle stop or turn lamps are commanded on.

The BJB trailer tow park lamp relay supplies voltage to the trailer tow parking lamps when the vehicle parking are commanded on.

The BJB trailer tow reversing lamps relay supplies voltage to the trailer tow reversing lamps when the vehicle reversing are commanded on.

The TRM provides voltage to the trailer tow connector for trailer battery charging when all the following are true:

• the TRM detects that a trailer is connected
• the ignition is on and engine is running
• a brake pedal application has been detected in the present ignition cycle
• the BCM load shed strategy is not active (a message will be displayed in the instrument cluster, such as "Low Battery Features Temporarily Turned Off" or "Turn Power Off To Save Battery", to indicate that BCM load shed strategy is active)

The TRM directly (no relay) supplies fuse protected voltage for trailer battery charging.


Pinpoint Test for 12v Power

I know the manual wiring pinout sucks and is incorrect here, but the main point is triggering power to (Pin #4) on the pic you posted, Ford Manauls are not always correct

Refer to Wiring Diagrams Cell 95 for schematic and connector information. Normal Operation and Fault Conditions REFER to: Exterior Lighting - Overview (417-01 Exterior Lighting, Description and Operation) . REFER to: Exterior Lighting - System Operation and Component Description (417-01 Exterior Lighting, Description and Operation) . Possible Sources Fuse Wiring, terminals or connectors Trailer tow connector TRM Trailer concern Visual Inspection and Pre-checks Verify the BJB fuse 73 (30A) is OK. Inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow connector as required.

F1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR

Disconnect: Trailer. Ignition ON. Using a diagnostic scan tool, view the TRM Parameter Identifications (PIDs). Select the TRM Point Output Relay (PWR_PT_RLY) active command. Command the Power Point Output Relay active command ON. Measure: Connectors: Positive Lead Measurement / Action Negative Lead 7-Pin Connector, Pin 5 Ground Is the voltage greater than 11 volts? Yes The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.​ No GO to F2​

F2 CHECK FOR VOLTAGE TO THE TRAILER TOW CONNECTOR (VEHICLE HARNESS)

Ignition OFF. Disconnect: Trailer Tow C4099 . Ignition ON. Using a diagnostic scan tool, view the TRM Parameter Identifications (PIDs). Select the TRM Point Output Relay (PWR_PT_RLY) active command. Command the Power Point Output Relay active command ON. Measure: Connectors: TRAILER TOW CONNECTOR Positive Lead Measurement / Action Negative Lead C4099-5 Ground

TRM - Location (Behind Glovebox) If you have this installed, then you have the TRM, note the (TCU -Not Shown) Telecommunications Unit will be covering most of the module up as it is mounted over it (If I recall correctly)
So there should be (2) modules located in that spot, one on top of the other

I found the TCU but it looks like there is no TRM here. Nothing happens when I plug in a trailer put it in gear then hit the brake. Looks like I'm doing some extra wiring.

 

[PoorSpecRanger]

Non-tow package XL means you are going to have to run your own charge line. The non-tow Xls don't have the TBC harness or the trailer module.

Fortunately there is a free 12V harness under the bed. You will see a small pigtail on the driver side of the bed with nothing plugged into it. That is where I sourced power for my charge line.

I think that may have been the pigtail for the 12V bed socket. I have the 12V socket in my bed but maybe its not a horrible idea to use this circuit any way.

 

[Big Blue]

I think that may have been the pigtail for the 12V bed socket. I have the 12V socket in my bed but maybe its not a horrible idea to use this circuit any way.

I would be careful using this curcuit for your trailer brakes if you ever plan to use the bed socket for any thing while towing. Would be bad to pop the fuse and loose your trailer brakes, and not know it.

I use my bed socket to run a 12V cooler when we go camping. Also that curuit is only, I believe 20 amp, so sharing it may not be a good idea.

 

[PoorSpecRanger]

Looks like I'm probably going to end up using a relay like the one on amazon below to turn the 12 circuit on and off to avoid killing my battery. A 40 amp automatic reset circuit breaker and some 10 Awg wire should do the trick.

https://www.amazon.com/dp/B01CXA42XK?ref_=cm_sw_r_cp_ud_dp_QWNRPTQB1VHZ6P7KJFSR

 

[Geoff]

I have a 2019 Lariat and wanted to figure out a way to have the 12V Charge circuit [Pin 4] light up without a trailer connected (my camper has a battery I want to keep charged).
It turns out a 1A 12V lamp on the LT and Stop Lite connection [pin 5] will 'trick' the TRM into turning on the 12V charge line.
The truck needs to be running and in gear for the charge circuit to stay energized. Putting the truck in Park deactivates it but it turns back on in Drive. Perfect.
It may work with a lighter load, I have not tried.

Sponsored