Strange electrical problem

[usmc81301]

I just replaced all the harnesses about mid last year and all has been working well. A couple days ago while driving the marking lights and taillights went out but everything else works just fine. I have head lights, turns signals, panel lights and brake lights. The problem is that I can't drive at night when the tail lights won't glow. I have went down each line with an ohm meter and all seems to be well. I am out of ideas and looking for some expertise from all of you.


P.S. I did look at the wiring chart and pin schematics

 

[dilvoy]

When weird stuff happens, check the grounds. Maybe make a ground harness from every ground wire to the battery, because the aluminum body might not have good conductivity through the body and rivets joining the body panels together.

 

[WillWagner]

Just for an experiment, clip jumper cables to the - side of the batteries and then to a clean spot on the frame and body then see if things work.

 

[Augi]

Try replacing your light switch too...

 

[usmc81301]

Thanks for all the advice. I will give these things a try. Still wired that everything works and has worked fine and it is just this couple lights not working. At least it works good in the day.

 

[Augi]

All the lights you mentioned are on the 'parking lights' circuit. It would make sense if the light switch went south and is not supplying power to that circuit.

Augi

 

[BLK HMMWV]

You using the old 3 lever type switch or the new touch pad style?
BH

 

[usmc81301]

Ha the push button and i worked great then died and I just (within the last month) replaced with a 3 lever.

 

[papaydsailor]

have that problem all the time on mine and mostly its a grounding problem. aluminum with the harness wire is not a good conductor combination plus combined with dirt and vibration all the time. i run a direct wiring all the time on mine on groundings.