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Old 03-20-2017, 03:06 PM   #1
Mini-Skoolie
 
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Brake light switch 97 Thomas MVP

I'm guessing this is the right group to put this in. My MVP doesn't have brake lights anymore and I have been trying to trace wires to a switch but have had no luck. Found the wire that goes to the brake lights and can make them work from all the way to the harness by the distribution center but have had no luck finding a switch. Help please and thank you in advance
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Old 03-20-2017, 05:15 PM   #2
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Welcome bmartin194

I'm no electrician but that sounds like a bad fuse or breaker. On the other hand that's the first thing you'd likely check.

Other more electrical minded individuals will pitch in when they find this thread.
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Old 03-20-2017, 05:36 PM   #3
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Thank you. I have checked all the fuses and breakers I know to check that's why I'm thinking it's a switch but am having trouble tracking it down. Been an auto mechanic and offshore mechanic all my life. I have seen a switch on the brake valve but there is no power going to it and the wires do not match the closet wire in the harness that go back to the brake lights. I don't think it goes through the turn signal switch like most vehicles since the brake lights are separate.
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Old 03-20-2017, 06:58 PM   #4
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I'm no help electrically. If it goes beyond a '65 Ford PU wiring, I'm lost. I fuss with electrical problems for weeks and finally have to spend to get it fixed, but even then I learn something.

I'm still hoping some of the others will lend their electrical expertise. While you're waiting I'd suggest reading other current electrical issue threads and get to know who the electrical minded people are.

Electrical, Charging and Solar - School Bus Conversion Resources

This link looks like mainly solar information but you might find something in there. Have you tried Youtube yet?
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Old 03-20-2017, 07:08 PM   #5
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No not yet but thank you I will. If I could dig up a wiring diagram I would probably be home free. Appreciate the input
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Old 03-20-2017, 07:30 PM   #6
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There is talk about the wiring being partially designed by the chassie manufacturer and the body manufacturer wiring the body electrical system. You can sometimes get either the body wiring diagram or the chassie diagram. We use diagrams from other buses that are similar with some luck. There are experts here with years of experience. I'm not one of them.
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Old 03-20-2017, 09:46 PM   #7
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The brake light switch probably isn't what you are used to seeing. If you have air brakes it's probably air operated.
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Old 03-20-2017, 10:14 PM   #8
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Right and there is actually a pressure switch on the foot valve but wiring doesn't match up so I'm a little apprehensive on just putting power to it and seeing what happens
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Old 03-21-2017, 07:19 AM   #9
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Just how did you test them as you said tom make them work from one point to another. How did you activate them? Is it air brake or hydraulic? You have to be more specific with your request. If not, all we can do is guess what you have done or tested.
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Old 03-21-2017, 07:25 AM   #10
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Quote:
Originally Posted by BlackJohn View Post
Just how did you test them as you said tom make them work from one point to another. How did you activate them? Is it air brake or hydraulic? You have to be more specific with your request. If not, all we can do is guess what you have done or tested.
Give John whatever info he needs- he's a super smart and HELPFUL feller.
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