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+--- Thread: reverse/ back up light troubleshooting (/showthread.php?tid=3142)
reverse/ back up light troubleshooting - alborz - 05-28-2018
stopped at the scale by DOT and complete level one inspection.
back uplight was not working.
I tested the wiring and at the reverse switch at the top of transmission checked the wires. one light up the tester but I think doesn't have enough voltage to light up a bulb .
didn't find a fuse
any help will be appreciated
2010 peterbilt 387
13 Spd eaton trans
RE: reverse/ back up light troubleshooting - snailexpress - 05-28-2018
(05-28-2018 )alborz Wrote: stopped at the scale by DOT and complete level one inspection.Back up switch is NO normally open switch. When you put in R it will close relay circuit to the ground and relay will send +12 v to backup light. LCM could be used too.
back uplight was not working.
I tested the wiring and at the reverse switch at the top of transmission checked the wires. one light up the tester but I think doesn't have enough voltage to light up a bulb .
didn't find a fuse
any help will be appreciated
2010 peterbilt 387
13 Spd eaton trans
To check switch - in neutral it should be some voltage present on switch terminal if wire connected or infinity resistance with wire disconnected
In R position 0 volts or 0 ohms accordingly.
RE: reverse/ back up light troubleshooting - Moose - 05-28-2018
I'm having the same problem on a 2014 paccar. Someone told me there is a circuit breaker somewhere but I have yet to find it. I've run a ground separate to the trans switch and I'm still having intermittent issues.
RE: reverse/ back up light troubleshooting - Moose - 06-03-2018
Does anybody on here have access to the Paccar wiring PDFs? I know the CECU plays a big role in this but all the diagrams I have are for my old KW...
I'm still chasing my problem and I'm well into the body and it keeps getting better. Now I have 8vdc at both stop/turn when they're supposed to be 0vdc and I'm still losing the reverse voltage.