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Old 12-08-2012, 01:36 PM   #1
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Location: Everett,PA
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Pac brake coming on with hazards

I am running out of ideas fast. Symptoms are as follows; pac brake works like it should except that it will also come on when the brakes are applied and when the hazard lights are turned on. It actually cycles with the hazard lights. Here is the weird part. It won't come on with individual turn signals. Right after I purchased the coach I added a light to the switch so that I wouldn't forget and leave the pac switch on. When I touch the brakes now the red light for the switch will light only about half of what is normal which tells me it is backfeeding somewhere.

The only modifications I have made has been converting all the exterior running lights to led. I did add additional led brake/turn and running lights in addition to switching the stock bulbs. My first thought was that I somehow attached a hot to a ground on one of the new lights, but I would think that it would happen on individual turn signals as well....right? I haven't had time to switch the led bulbs back to incandesant on the factory brake lights.

I am up for any ideas. The coach is a 99 Tourmaster on a Spartan chassis.
The Collins Family
Travis, Kim, Richard, Rebecca
2 Yorkies(Sophie and Annie)
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Old 12-08-2012, 01:48 PM   #2
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Not sure this will help or not wiring for Pac Brake.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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Old 12-08-2012, 08:44 PM   #3
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Location: Moorpark, Ca.
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I would reinstall the tail/brake lights and see what happens. A lot of the systems use the brake lights as a trigger for the exhaust brake. A lot of issues arise when you change to LED and the resistance is lowered in the system.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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Old 12-20-2012, 05:50 PM   #4
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I reinstalled the original bulbs, but I still have the problem. I need to keep searching....
The Collins Family
Travis, Kim, Richard, Rebecca
2 Yorkies(Sophie and Annie)
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