So I've been chasing a headlight problem on my 05 379.
Since I bought it the drivers side light was dim on low beam and the indicator stayed on. I finally got it sorted out, the ground and low beam wire were swapped.
A few days later, the same issue is happening, then the low beam on the driver's side was out completely, high beam works. Stopped down the road to check and all is fine.
Tonight I'm running, and both low beams go out, high beams seem week.
I'm guessing ground. Can anyone point me to where the ground is connected to the chasis for the headlights?? Or any other suggestions on what it could be?
2005 379 headlight issues
Discussion in 'Peterbilt Forum' started by Cajuncowboy654, Jan 12, 2021.
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I dont think your gonna find a ground to chasis. IT all goes into a harness to main harness. THe problem i see in my 379 with this issue is the plug that goes into the headlights. They are all corroded. Take a good look in the connections. Sometimes it cause my braker switch to pop. I was thinking about replacing the whole plug behind the headlight. you should probably do the same. Pull the headlight out and keep plugging in and unplugging the light while the light switch is on and see what happens and notice if the lights come back on
Farmtractor9900 and 650cat425 Thank this. -
The plugs are clean. Checked them when I had it apart last week. Thats when I found the drivers side wires switched.
Both low beams won't work now and the high beams are weak. Dont think its the plugs. -
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I'd wire each headlight direct to battery to verify they are functioning properly before chasing any possible wiring issues.
Cajuncowboy654 Thanks this. -
My plan is to is a test light to verify its getting power to the plug then if it is ill use a jumper wire from a good ground to the ground pole of the light and see if it works -
Check around the hood hinges. They are notorious for crushing the wires and causing problems
Both headlight harnesses meet behind the bumper and plug into another harness that runs back to the pass through on the cab -
Check Hi/lo switch on column.
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