2nd Gen Non-Engine/Transmission electrical

[PBrehm]

I have an electrical problem. I have a 99 1 ton that is a rebuilder it had a cab fire. I replaced all engine and fender looms, I got a different cab with a different dash. I put it all together and everthing works except the head lights. I turn the lights on and both headlights come on, but when I click on high beams the headlights go real dim almost out so do running lights my mechanic checked the grounds and says there good. He cant seem to find the problem, so i am looking for some ideas. Thanks pat

 

[B.G. Smith]

Headlights

The 99 is wired with the headlight circuit hot and the headlight switch and dimmer switches the ground to turn them on. If the head light switch and the wiring harness are not both 99 that may be the problem. bg PS ( The wire that would normally be the ground is hot and the other two are switched to ground for high and low beam ) bg

 

[PBrehm]

I will have to check that out thanks. pat