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Bonez69 · 06-27-2022, 09:42 PM

2013 Passport Elite 32FB
Tail/Marker lights immediately blow the fuse on my truck.
Turn/Brake lights work.
E-brakes and "+12V" also works.
Truck is verified GOOD with a new fuse and towing another trialer. Also checks GOOD with a 7-way plug tester.

So far, I have verified that the umbilicle cable is not shorting out by a continuity test when disconnected at the trailer junction box.

I did find that the green (tail/marker lights) wire (@ junction box) is shorted to ground with a continutiy test.

So........ Following the green wire from the junction box, it enters the belly area of the trailer. I started to remove the screws that hold up the "corrogated cardboard" type plastic belly cover to further trace the wire. It goes to the driver's side marker light just behind the rear axle. The wires for this light is easily accessible as 2 x green and 2 x white are within the wire loom that come out of the belly. I have identified that one of these green wires is the other end at the junction box. Verified this with a quick continuty test using another long wire to isolate the circuit.

To further verify, I connected only this green wire and the white wires connected; the light works when +12 is applied at the trailer plug (pin3). I am using a resetable fused (20A) jumper to apply the +12V. Fuse rating matches my trucks fuse that get blown.

So where does the 2nd green wire go from here?
I decided to check out the same maker light but on the passenger side since it too is easily accessible via exposed wire loom. Bingo! One of the 2 x green wires on this side appears to be the other end from the driver side light. I now have TWO side marker lights working and now have to trace where this 2nd wire goes.

Here is the "hurdle" happening in following the green wire. EVERYONE of those metal screws (#14x1"+washer) that hold the belly cover on are so bloody rusted that the heads snap off. Not looking forward to drilling these out to reinstall new screws. AND on the passenger side, there is an external propane line (pipe) sandwiching the belly cover. Freaking more dissasembly!?!?

An alternate option (I think) is to stop looking under the belly but to start peeling silicone and removing the light assemblies (one by one) to access the green wire. I am thinking this as there is no other way to trace the green wire to the clearance/marker lights that at the roof line (front and back).

So here I ask.... Has any one "followed the green" wire and can possible reveal ANY quick suggestions from experience? Order of lights to remove?

06-27-2022, 09:42 PM	#1
Bonez69 Junior Member Join Date: Jun 2022 Location: Sherwood Park Posts: 4	Tracing The Wire 2013 Passport Elite 32FB Tail/Marker lights immediately blow the fuse on my truck. Turn/Brake lights work. E-brakes and "+12V" also works. Truck is verified GOOD with a new fuse and towing another trialer. Also checks GOOD with a 7-way plug tester. So far, I have verified that the umbilicle cable is not shorting out by a continuity test when disconnected at the trailer junction box. I did find that the green (tail/marker lights) wire (@ junction box) is shorted to ground with a continutiy test. So........ Following the green wire from the junction box, it enters the belly area of the trailer. I started to remove the screws that hold up the "corrogated cardboard" type plastic belly cover to further trace the wire. It goes to the driver's side marker light just behind the rear axle. The wires for this light is easily accessible as 2 x green and 2 x white are within the wire loom that come out of the belly. I have identified that one of these green wires is the other end at the junction box. Verified this with a quick continuty test using another long wire to isolate the circuit. To further verify, I connected only this green wire and the white wires connected; the light works when +12 is applied at the trailer plug (pin3). I am using a resetable fused (20A) jumper to apply the +12V. Fuse rating matches my trucks fuse that get blown. So where does the 2nd green wire go from here? I decided to check out the same maker light but on the passenger side since it too is easily accessible via exposed wire loom. Bingo! One of the 2 x green wires on this side appears to be the other end from the driver side light. I now have TWO side marker lights working and now have to trace where this 2nd wire goes. Here is the "hurdle" happening in following the green wire. EVERYONE of those metal screws (#14x1"+washer) that hold the belly cover on are so bloody rusted that the heads snap off. Not looking forward to drilling these out to reinstall new screws. AND on the passenger side, there is an external propane line (pipe) sandwiching the belly cover. Freaking more dissasembly!?!? An alternate option (I think) is to stop looking under the belly but to start peeling silicone and removing the light assemblies (one by one) to access the green wire. I am thinking this as there is no other way to trace the green wire to the clearance/marker lights that at the roof line (front and back). So here I ask.... Has any one "followed the green" wire and can possible reveal ANY quick suggestions from experience? Order of lights to remove?