RowdyRebel Posted September 19, 2017 Share Posted September 19, 2017 Trailer brake lights sometimes hang up and stay on. Brake lights on the truck are off, though...only the trailer lights are staying on. Hit the brakes with 5-10 psi application and release quickly and the lights go out like they should. It's a little frustrating, because unless I'm driving at night I have no clue if the trailer brake lights are on or not...unless I'm on the brakes. They always come on when I apply the brakes. They just don't always shut off on the trailer. If the tractor brake lights were also doing that, I'd say it would likely be the switch on the pedal...but it is ONLY the trailer brake lights acting up. Is there another switch or relay or something I need to find? 2001 CH613. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/ Share on other sites More sharing options...
Hobert62 Posted September 19, 2017 Share Posted September 19, 2017 When I was wiring and plumbing my B I either read or was told some trucks have seperate brake light switches for tractor & trailer. I don't rember where or who I heard it from. Quote Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-380055 Share on other sites More sharing options...
Timmyb Posted September 25, 2017 Share Posted September 25, 2017 Do you have led or bulb lights on the truck? I had a similar thing where the trailer brake lights stayed on, only when park lights were on. Quote Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-380584 Share on other sites More sharing options...
Swishy Posted September 25, 2017 Share Posted September 25, 2017 (edited) Disconnect the brake control @ the glad hand n feel/listen for any air in that line wen the trailer is charged up with the supply hose If n U get my drift cya §wishy Edited September 25, 2017 by Swishy Quote Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-380598 Share on other sites More sharing options...
david wild Posted September 25, 2017 Share Posted September 25, 2017 trailer brake light switch is sticking, you did not say brand of truck, Pete and KW both have seperate switch, have worked on both and that was problem. Quote Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-380602 Share on other sites More sharing options...
david wild Posted September 25, 2017 Share Posted September 25, 2017 so I see you said mack CH613, check with a Mack guru, they will know if it has a split system. Quote Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-380603 Share on other sites More sharing options...
RowdyRebel Posted October 10, 2017 Author Share Posted October 10, 2017 Turned out to just be the relay in the box on the firewall under the hood. I hate electrical problems. 1 1 1 Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/51023-odd-problem/#findComment-382084 Share on other sites More sharing options...
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