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Old 05-27-2017, 04:14 AM   #1
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Roof Marker Lights - Trying to locate Feed Wire

I have a 2012 Phaeton 40QBH on Freightlinr Chassis and I just failed my NYS inspection because the front and rear roof marker lights not working. I checked all fuses and I swapped the relay in the front lower left compartment but still nothing. All other lights are working. I purchased the Paheton Electrical schematics but they are worthless they are for wire harness assembly mostly. I'm pretty good with electrical troubleshooting so I'm not afraid to dig in on this issue, just wondering if anyone has seen similar.
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Old 05-27-2017, 04:37 AM   #2
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Have you tried checking for power at the switch yet? I've seen plugs fall off many times causing your described problem.

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Old 05-27-2017, 05:16 AM   #3
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It appears the system is electronic. The dash switch controls relays and I swapped similar relays. I actually disassembled the switch and it's just a circuit board with contacts inside. Very light gauge wiring to control the circuit. I'm wondering if the ICC switch could be part of the issue sine this switch controls the lights also?
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Old 05-27-2017, 06:14 AM   #4
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Check the grounds.
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Old 06-05-2017, 10:09 AM   #5
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update

Update: I found the front roof marker lights feed off the marker light next to the drivers side headlamp socket. They are protected by a 1amp in line fuse on the +12vdc wire and a 2amp in line fuse on the ground wire. One of the LED's on the front had taken water inside and the circuit board was dead shorted to ground. I ordered all new LED's for the front. The back led's feed from the passenger side rear marker in the tail light assembly. This also has a 1 amp in line fuse and that was blown. I have not had the time to diagnose the cause. I plan to disassemble and check every light and to seal them properly.
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Old 06-05-2017, 10:18 AM   #6
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Quote:
Originally Posted by Mnichols4 View Post
Update: I found the front roof marker lights feed off the marker light next to the drivers side headlamp socket. They are protected by a 1amp in line fuse on the +12vdc wire and a 2amp in line fuse on the ground wire. One of the LED's on the front had taken water inside and the circuit board was dead shorted to ground. I ordered all new LED's for the front. The back led's feed from the passenger side rear marker in the tail light assembly. This also has a 1 amp in line fuse and that was blown. I have not had the time to diagnose the cause. I plan to disassemble and check every light and to seal them properly.
Thanks for the update .... good info !
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