Midland Oilfield Posted September 28, 2022 Share Posted September 28, 2022 Im working on a 2016 Mack GU713. Now all the headlights and running lights work off of their respective switches except for the low beam driving light on the passenger side that comes on when you release the spring brakes. I have put a new headlight wiring harness on it for other reasons and have checked all the fuses and relays I can find. Does anyone have an idea as to what it could be? Passenger side low beam driving light wont come on but the low beam light will turn on when you turn the running lights and head lights on at the switch. Also so far I have not found a broken wire anywhere. Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/ Share on other sites More sharing options...
Joey Mack Posted September 28, 2022 Share Posted September 28, 2022 Have you un plugged the right side and checked for power on the harness to see if it is getting power correctly? Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/#findComment-510496 Share on other sites More sharing options...
Midland Oilfield Posted September 28, 2022 Author Share Posted September 28, 2022 Yes its not getting power. I am trying to track down where it gets power for the driving light. It doesnt make sense to me that the light works on the switch, but will not light up when the brake button is pushed in. And its only on one side. Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/#findComment-510519 Share on other sites More sharing options...
Joey Mack Posted September 28, 2022 Share Posted September 28, 2022 Hmmm... That is strange, Is the light control module faulty? How about a loose or bad ground wire... They are 'gray' in color.. I assume that a pressure switch on the park brake system controls the lights as well.. I dont know.. It may be best that I set back and watch, and if I come up with something, I will jump back in.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/#findComment-510520 Share on other sites More sharing options...
Midland Oilfield Posted September 28, 2022 Author Share Posted September 28, 2022 Thanks. I'm sure there's a switch somewhere that controls it, I just haven't found it yet. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/#findComment-510525 Share on other sites More sharing options...
Joey Mack Posted September 28, 2022 Share Posted September 28, 2022 Good luck sir... keep in touch... Quote Link to comment https://www.bigmacktrucks.com/topic/70490-headlight-issues-on-a-gu713/#findComment-510526 Share on other sites More sharing options...
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