left 12v power outlet on dash not working, can't find fuse

[O-Ranger]

Hey everyone,

The left side 12v cigarette lighter/power point on my 2019 Lariat has stopped putting out power. The right side one works just fine.

I've checked the fuses under the steering wheel and in the engine compartment with a voltmeter and can't find any that are blown.

I went through the owner's manual, but can't find anything. Starting to get stumped, any ideas?

Thanks!

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[RangerBill]

Hey everyone,

The left side 12v cigarette lighter/power point on my 2019 Lariat has stopped putting out power. The right side one works just fine.

I've checked the fuses under the steering wheel and in the engine compartment with a voltmeter and can't find any that are blown.

I went through the owner's manual, but can't find anything. Starting to get stumped, any ideas?

Thanks!

The fuse F10 or F16 located in the battery junction box BJB under the hood feed dash power point 1 and 2. See owner's manual in Fuses section for under hood fuse box and its fuse layout.

 

[O-Ranger]

Thanks for the diagram!

I've pulled and checked the F10 and F16 fuses, they both had continuity.

I replaced them anyway with new fuses, but still no power on the left side.

I'm wondering if it's an issue with the relay (which is marked as non-serviceable)?

 

[O-Ranger]

more info:

pulled fuses in slots F10 and F16. WIth engine running, the pins in F10 produce current, but F16 does not.

So, no voltage/power is going TO F16.

 

[airline tech]

Fuse 16 - Feeds the RH Power Point (Power Point 2)
Check for codes to see if (FET) Tripped the output off

 

[RangerBill]

more info:

pulled fuses in slots F10 and F16. WIth engine running, the pins in F10 produce current, but F16 does not.

So, no voltage/power is going TO F16.

Is there voltage at F10? I think F10 feeds the left dash power point. Check with truck running.

 

[O-Ranger]

There is power at F10, which feeds the passenger side (right) port. (called Aux port 1)

There is NO power at F16, which I assume feeds port 2 (on left/driver side)

checked with truck running.

I'll have to dig up a ODBII scanner and see if I can read any codes.

 

[RangerBill]

There is power at F10, which feeds the passenger side (right) port. (called Aux port 1)

There is NO power at F16, which I assume feeds port 2 (on left/driver side)

checked with truck running.

Then there would seem to be an open circuit inside the BJB, since F10 and F16 are connected together and fed from the same connection to the relay as shown in the diagram that I posted above.

 

[RangerBill]

I assume that you checked both F16 fuse sockets for power and found none, but you had power on F10.

 

[O-Ranger]

Then there would seem to be an open circuit inside the BJB, since F10 and F16 are connected together and fed from the same connection to the relay as shown in the diagram that I posted above.

I'm seeing that F10 and F16 are connected after the relay output, which doesn't make complete sense to me, as they should both be getting power?? Perhaps the relay has two parallel outputs.

But, unfortunately, you might be right a fault in the BJB.

 

[RangerBill]

I'm seeing that F10 and F16 are connected after the relay output, which doesn't make complete sense to me, as they should both be getting power?? Perhaps the relay has two parallel outputs.

But, unfortunately, you might be right a fault in the BJB.

Yes, that is correct, they are both connected together and both should receive power at the same time. It looks like an open connection in the BJB to F16 fuse holder.

 

[airline tech]

The FET has most likely triggered, look at how the Coil Ground (FET) is wired.
Each leg of the relay has a separate (FET) and is shared by the 2 relays, so more than likely Fuse 17 & 29 are also dead

 

[RangerBill]

The FET has most likely triggered, look at how the Coil Ground (FET) is wired.
Each leg of the relay has a separate (FET) and is shared by the 2 relays, so more than likely Fuse 17 & 29 are also dead

If one dash power point is working, then the other should as well if both fuses are good and no open connections. The relay is a set/reset relay and has a set and a reset coil (power on/power off) that the FETs are controlling. It doesn't appear to be two separate circuits (relays) for the 2 power points.

 

[O-Ranger]

I was hoping there was some reset button for the FET/relay to reset...


Both Fuse for 17 and fuse for 29 have continuity. Both visually look good.

F17 (cargo bed) does NOT have power at the fuse. My aftermarket 12v socket in the bed does power up.

F29 (USB ports) does have power at the fuse, and USB powers up.

 

[RangerBill]

I was hoping there was some reset button for the FET/relay to reset...

F29 (USB ports) does have power at the fuse, and USB powers up.

If F29 has power, this proves that the FETs are working and there appears to be open connections in the BJB to some of the fuses. Was there any evidence of water entry into the BJB?

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