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Old 05-03-2012, 11:09 AM   #1
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Stuck Brake light switch?

Golden Gopher
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Guys;

With ignition turned off, rear brake lights and ABS light, and what I believe to be an ABS motor or pump continues to run?

When I start engine motor/pump sound goes away (or is operational with engine and hence not noticeable).

Is it a stuck or defective brake light switch or something more serious?

I had to disconnect chassis battery to stop pump and turn off brake lights!
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Old 05-03-2012, 11:52 AM   #2
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Try reaching down and pulling the brake pedal up with your hand. If it stops. it is the pedal. if not, look just up from the pedal and you ill find a switch that is adjustable. It is out of alignment. If you adjust it you will find it will cut off.
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Old 05-03-2012, 11:59 AM   #3
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Originally Posted by Golden Gopher View Post
Golden Gopher
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Join Date: Apr 2003
Location: Brooklyn Park, MN USA
Posts: 39
Guys;

With ignition turned off, rear brake lights and ABS light, and what I believe to be an ABS motor or pump continues to run?

When I start engine motor/pump sound goes away (or is operational with engine and hence not noticeable).

Is it a stuck or defective brake light switch or something more serious?

I had to disconnect chassis battery to stop pump and turn off brake lights!
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2002 Newmar Mountain Aire 3566

W22, w/22.5 Michelin XRV
Sounds like a classic case of a shorted diode, allowing 12V to be fed back to those circuits. Without a schematic of the rig, and just guessing here, I'd check close to the alternator for an in-line diode, and under the dash for diodes.
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