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

[RangerBill]

The way a Set/Reset (aka Latching Relay) relay works is there are 2 coils in the relay. The set coil when pulsed, turns the relay on and it latches on. A reset pulse on the reset coil unlatches the relay and it turns off. The shop manual is showing this type of latching relay.

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[O-Ranger]

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?

none. it wasn't even dusty inside the box. I live in Southern California, so its pretty dry.

It might have been bad luck, or a poor part? I'm guessing that a whole new BJB is going to cost more than I want to spend. I've still got the one power point at least.

Thanks for helping me diagnose, I really appreciate it.

-robert

 

[RangerBill]

none. it wasn't even dusty inside the box. I live in Southern California, so its pretty dry.

It might have been bad luck, or a poor part? I'm guessing that a whole new BJB is going to cost more than I want to spend. I've still got the one power point at least.

Thanks for helping me diagnose, I really appreciate it.

-robert

It may be possible to remove the BJB and take it apart to look at the bottom side of the circuitry and look for broken connections to the fuse holders that are not receiving power and repair them.

 

[O-Ranger]

$262 is actually better than I was expecting. Not sure what that says about expectations these days.

 

[RangerBill]

$262 is actually better than I was expecting. Not sure what that says about expectations these days.

Double check that part number KB3Z-14A068-B with @Benny (Levittown Ford) before ordering.

I went and checked on my 2019 Ranger BJB fuse 10 and 16 when powered down and fuses pulled. I had zero ohms resistance between the two fuse holders on the sockets closest to the left fender. This is as shown on the wiring diagram. If yours shows an open connection between these fuse holders, then your BJB is bad.

 

[O-Ranger]

Double check that part number KB3Z-14A068-B with @Benny (Levittown Ford) before ordering.

I went and checked on my 2019 Ranger BJB fuse 10 and 16 when powered down and fuses pulled. I had zero ohms resistance between the two fuse holders on the sockets closest to the left fender. This is as shown on the wiring diagram. If yours shows an open connection between these fuse holders, then you BJB is bad.

There is continuity/0.0 ohms between the pins closest to the drivers side. No continuity between any other pins.

 

[RangerBill]

There is continuity/0.0 ohms between the pins closest to the drivers side. No continuity between any other pins.

That is what it should be. If you start the truck with those fuses removed, do you have 12+ volts at each of those pins to ground?

 

[O-Ranger]

F10 has good voltage either across the pins, AND from the driver's side pin to ground.

F16 has NO voltage across the pins, but does have 12V from the driver's side to ground.

 

[RangerBill]

F10 has good voltage either across the pins, AND from the driver's side pin to ground.

F16 has NO voltage across the pins, but does have 12V from the driver's side to ground.

Then the BJB is probably good. Try switching the two fuses and see if the problem goes to the other power point on the dash. If it does change, then that fuse is bad.

 

[RangerBill]

Another test is to check the fuses when removed, with an ohmmeter. There should be close to zero ohms across the fuse blades.

 

[O-Ranger]

Then the BJB is probably good. Try switching the two fuses and see if the problem goes to the other power point on the dash. If it does change, then that fuse is bad.

Another test is to check the fuses when removed, with an ohmmeter. There should be close to zero ohms across the fuse blades.

. Both fuses are new, they both check out to 0 ohms and the old beeping continuity test.

 

[RangerBill]

. Both fuses are new, they both check out to 0 ohms and the old beeping continuity test.

Can you explain how you are testing for voltage across the F10 fuse ?
If you have a good F16 fuse and are seeing 12 volts to ground on F16 driver's side fuse socket, then you should see 12 volts on the other side of the fuse, if it is good. There may be an open connection from the load side of the F16 fuse to the BJB plug or anywhere in the circuit to the power point socket. Check for voltage on pin 49 of the BJB connector C1035A (violet-red wire) with the truck powered up.

 

[O-Ranger]

Can you explain how you are testing for voltage across the F10 fuse ?
If you have a good F16 fuse and are seeing 12 volts to ground on F16 driver's side fuse socket, then you should see 12 volts on the other side of the fuse, if it is good. There may be an open connection from the load side of the F16 fuse to the BJB plug or anywhere in the circuit to the power point socket. Check for voltage on pin 49 of the BJB connector C1035A (violet-red wire) with the truck powered up.

I was pulling the fuse (both slots) and placing both test leads onto the pins in the slots. F10 is showing 12+ Volts, F16 does not. I've rechecked a few times.

I think you're right in that there might be a fault between the F16 pass side pin and the power point.

Starting to get dark, I'll have to try and check the other connector soon.

 

[RangerBill]

I was pulling the fuse (both slots) and placing both test leads onto the pins in the slots. F10 is showing 12+ Volts, F16 does not. I've rechecked a few times.

I think you're right in that there might be a fault between the F16 pass side pin and the power point.

Starting to get dark, I'll have to try and check the other connector soon.

If you are measuring voltage across the fuse socket with the fuse removed, this is not a good test of the circuit.

If you have an extra fuse, pop the top off of it. This will allow you to measure voltage to ground on both sides of the fuse while installed. You should have 12 volts on either side of the fuse to ground with the truck powered up.

I wouldn't order a BJB at this point, until more trouble shooting is done.

 

[RangerBill]

I was pulling the fuse (both slots) and placing both test leads onto the pins in the slots. F10 is showing 12+ Volts, F16 does not. I've rechecked a few times.

If you have something plugged into one dash power point, that fuse when removed, would show voltage across the fuse socket. The one with nothing plugged in would show 0 volts across its fuse socket.

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