Rear clearance lights

[twohendrens@gmail.com]

Hello all, looking for a little help. I have a 2017 Thor PD31. The rear clearance lights stopped working a few weeks ago. I know the light fixtures and bulbs are good. I’m assuming it’s a bad ground connection. I have a schematic but it really doesn’t give a harness routing location. I’ve searched down the back of camper on both sides and can’t find where the harness comes in for the lights. Anyone have an idea how the harness is routed!
Thanks, Dan

 

[16ACE27]

Generally, everything is this area is wired down the rear wall on one side or the other of the rear window. You should have a removable panel in the upper rear curve that will give you access to the back of these lights and the wiring harness. The ground will be underneath on the chassis.

 

[Jimbo57]

My guess is center light is incoming power from roof or end lights from side , also check side markers connection maybe loose

 

[twohendrens@gmail.com]

I can see the panel you’re referring to. What’s the best way to remove? Never removed an interior panel before. Don’t want to damage it. Thanks!

 

[16ACE27]

I can see the panel you’re referring to. What’s the best way to remove? Never removed an interior panel before. Don’t want to damage it. Thanks!

Most (qualifying term) are held in by tension/friction. There should be a plastic channel at both the top and bottom. Pushing the center of the panel in (making it more curved) pushes the edge out of the panel allowing it to become uncaptured and removable.

 

[twohendrens@gmail.com]

Ok, here’s a good one for you. I’m an electrician by trade so I’ve seen a bunch. Actually found the supply wires to the back icc lights. Checked voltage at the lights and had 12.8…. All good but no lights. Disconnected the lights and checked supply voltage at each one…all good at 12.8. Still no lights. Replaced each light with new led (previous were led) and checked during the process and each light lit! All good! Here’s the strange part, all the replaced lights were bench tested with a 12v battery and all tested (lit up) good! What the ****! Hope someone can explain!

 

[16ACE27]

Ok, here’s a good one for you. I’m an electrician by trade so I’ve seen a bunch. Actually found the supply wires to the back icc lights. Checked voltage at the lights and had 12.8…. All good but no lights. Disconnected the lights and checked supply voltage at each one…all good at 12.8. Still no lights. Replaced each light with new led (previous were led) and checked during the process and each light lit! All good! Here’s the strange part, all the replaced lights were bench tested with a 12v battery and all tested (lit up) good! What the ****! Hope someone can explain!

How did you test? Did you have both a + and a - lead to each light or did they rely on a common ground? Did you test + to a known good ground?

 

[twohendrens@gmail.com]

I used a fluke multimeter to test. Like I said, had 12.8 volts at the supply line. All lights had a + and - lead. As stated, I disconnected the old light and attached it directly to the supply line wires. It did not light. But I connected the new light to those same wires and it did. I checked each individual old light this way. None of them lit but all the new ones did. I replaced all the lights with the new ones and all function. So I took all the old lights to the work bench and checked them individually directly connected to a 12 volt battery. They all worked! Don’t understand it but at least the rig is fixed now.