excavator28 Posted June 13, 2023 Share Posted June 13, 2023 Hey guys, I have an odd problem I can't seem to figure out. I have a 1991 mack ch613 and the headlights work fine with the key in the off position. As soon as you turn the key to the on position or the truck is running it trios the circuit breaker and causes the lights to go out. I checked all the basic stuff lole bare wires oh shitty connections. I cleaned all that stuff and I'm still having a problem. Anyone ever had a similar problem and find a solution 9ther than wiring the lights by themselves to a separate switch? Quote Link to comment https://www.bigmacktrucks.com/topic/72947-1991-ch613-lights-turn-off-with-key-on/ Share on other sites More sharing options...
Joey Mack Posted June 13, 2023 Share Posted June 13, 2023 Do the headlight wires run behind the oil filters? If so, check there, especially at the wire clamps bolted to the engine. Quote Link to comment https://www.bigmacktrucks.com/topic/72947-1991-ch613-lights-turn-off-with-key-on/#findComment-532930 Share on other sites More sharing options...
excavator28 Posted July 13, 2023 Author Share Posted July 13, 2023 Had an old mack mechanic tell me to pull the relay for the running lights amd it fixed the problem and all the running lights work as they should... no idea why but if someone needs a quick fix there ya go Quote Link to comment https://www.bigmacktrucks.com/topic/72947-1991-ch613-lights-turn-off-with-key-on/#findComment-534724 Share on other sites More sharing options...
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