LILSMOKERMACK Posted January 2, 2012 Share Posted January 2, 2012 re: 1979 Mack -U ModelTrying to find Electrical Diagram or someone who can offer help with The Wiring of Dimmer sw to terminal block then on the 3-prong connector on headlamps for hi/lo Beam . We have only high beams and when press dimmer sw lights go out . Quote Link to comment Share on other sites More sharing options...
Rob Posted January 2, 2012 Share Posted January 2, 2012 re: 1979 Mack -U ModelTrying to find Electrical Diagram or someone who can offer help with The Wiring of Dimmer sw to terminal block then on the 3-prong connector on headlamps for hi/lo Beam . We have only high beams and when press dimmer sw lights go out .Sounds like your dimmer switch has gone bad. They do this at a terrible rate in R model cabs. I put two in my trucks last year for the same reason.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
umodelnut Posted January 2, 2012 Share Posted January 2, 2012 re: 1979 Mack -U ModelTrying to find Electrical Diagram or someone who can offer help with The Wiring of Dimmer sw to terminal block then on the 3-prong connector on headlamps for hi/lo Beam . We have only high beams and when press dimmer sw lights go out .hay man do you have a picture of your u model? ive got a '75 u685st, and i dont think lights or my dimmer switch work! LOL Vinny Quote Link to comment Share on other sites More sharing options...
David Posted January 3, 2012 Share Posted January 3, 2012 I have copies of the full color wireing diagram. $5 and a sase. Quote Link to comment Share on other sites More sharing options...
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