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I'm hauling my camper from MD to AZ .Currently on 81 heading to 40
Lighting issue .Seems fine when cold, but after a couple hours of driving.,,j um...
No lights to the trailer
No Tail lights on the truck
When truck and lights are off, something is back feeding the parking light circuit, when, I unug the trailer it goes off
Brake controller going crazy
Radio tries to show the back up camera,totally unplugged at this point so that was not the it seems fine till I turn on headlights
Luckly my hotel is attached to the truck, but having to stop when it gets dark sucks, and honestly o an not sure if I have brakes and turns when it is acting up during the day.
Never had issues with this exact setup in the past?
Has any work been done to the trailer?
Have you gotten under it and checked all the wire runs?
Do you have a volt meter? Check and see if you are getting voltage
from the trailer ground point to the truck ground point. The loss of a
good ground can cause some really odd things to happen.
Use a jumper wire with some alligator type clips on it and go from one
clean spot on the trailer to a clean spot on the truck. The other thing
to
look at is the truck side connector. Look for green fuzz.
how long have you had the trailer & wiring harness on the truck?? is it a new setup or something that just started recently after years or having it??
reason i ask that is because ive run across a few people with similar descriptions after they paid someone to install the trailer harnesses on the trucks only to have it miswired because they spliced the wirings instead of doing PnP connectors.. these trucks were setup to use those kind of harnesses so no reason to splice or tap into wires with wiretaps..
Test the trailer side first. Take the plug and using a jumper wire or paper clip jump the two top terminals #3 & #4 (tail & 12v). At this point all of the trailer's marker lights should be on. If not then there's an issue.
Next jump #4 to 5 & then #4 to 6. This is to test the brake lights. Look for lights inoperable or lights coming on that shouldn't.
Lastly if you have a meter or test light, check #4 to #1-ground. The meter should show battery voltage or if using a test light it should illuminate. If it does then it confirms you have a ground and positive.
If all checks out then you can concentrate on the truck side. Look inside the reciever plug and look for bent or corroded terminals. Next I'd lay under the truck and unplug the harness plugs and inspect them for corrosion. Especially the plug on the backside of the 7-way reciever plug.
Let us know what you find.
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