clpetty Posted December 29, 2022 Share Posted December 29, 2022 (edited) headlights at times come on when vehicle is not running, but as soon as you start truck they go off im thinking the drl module. can i swap it with a standard 5 blade relay?I do have running lights the whole time and i tried new t/s switch Edited December 29, 2022 by clpetty Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted December 29, 2022 Share Posted December 29, 2022 If you don't require DRL's... Pull the module and leave it out, and see if it acts up after a while.. just a thought... Jojo 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted December 30, 2022 Share Posted December 30, 2022 The DRL module is a not a regular relay, it’s a specific relay/module and they’re a few different part numbers fir different years/models of Macks. The GR’s that replaced the GU’s have a totally different electrical system for lighting and use a LCM ( light control module) to control all lighting. Hopefully yours is a GU and not a GR when it comes to lighting problems. 1 Quote Link to comment Share on other sites More sharing options...
clpetty Posted January 16, 2023 Author Share Posted January 16, 2023 i found my issue diver had hit the snow plow switch on the dash...sorry it took so long to respond with my fix Quote Link to comment Share on other sites More sharing options...
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