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01-16-2020, 10:45 AM | #1 |
Junior Member
Join Date: Jan 2020
Posts: 9
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Brake light problem
I recently bought my first model A, (1930 Phaeton)
I'm having a problem with my brake light all lights seem to work properly with the steering wheel lever switch, but when i step on the brakes the tail lights go out and no brake light. ? ? ? I suspected the brake light switch, but when tested it seems to be working properly, although i question which wire should be connected to it ? Positive or Negative ? |
01-16-2020, 10:50 AM | #2 |
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Join Date: May 2010
Location: Tacoma, WA
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Re: Brake light problem
Are you 6 volts or 12 volts. Are you positive or negative ground?
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01-16-2020, 10:57 AM | #3 |
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Join Date: Jan 2020
Posts: 9
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Re: Brake light problem
6 volt positive ground
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01-16-2020, 10:58 AM | #4 |
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Join Date: Mar 2014
Location: Midland Park,N.J.
Posts: 1,108
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Re: Brake light problem
If it is the original 6 volt system it is positive ground,to test the stoplight switch put a jumper between the 2 connections at the stoplight switch,the brake light should go on,some repro switches are defective,short out inside when activated.
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01-16-2020, 12:24 PM | #5 | |
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Location: Red Deer, Alberta
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Re: Brake light problem
Quote:
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01-16-2020, 12:30 PM | #6 |
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Re: Brake light problem
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01-16-2020, 12:30 PM | #7 |
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Join Date: Jul 2011
Location: Redondo Beach, CA
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Re: Brake light problem
First thing I would do is check your grounds. Sounds like when you step on the brake light the voltage is trying to backflow thru the running light instead of going to ground. Hence the running light goes out and the brake light does not light.
Try connecting a jumper wire from a known good ground (bumper, frame, etc,) to the light housing to check. Bad grounds cause weird things to happen. Last edited by Y-Blockhead; 01-16-2020 at 12:48 PM. |
01-16-2020, 04:00 PM | #8 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Brake light problem
So if the brake switch has been checked and seems to be working properly, there is power at the switch and then thru the switch when pedal is depressed ?
Is there power to the brake bulb with pedal depressed ? If so, I'd recommend checking grounds. |
01-17-2020, 11:49 AM | #9 | |
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Join Date: Jun 2015
Location: Red Deer, Alberta
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Re: Brake light problem
Quote:
__________________
If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
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01-17-2020, 12:00 PM | #10 |
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Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
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Re: Brake light problem
I was watching a youtube vid the other day and when the guy stepped on the brakes the stop light came on and tail light turned off. Foot off the brakes and the tail light would come back on. Not sure what was going on there but it might be a similar problem.
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01-17-2020, 12:15 PM | #11 |
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Join Date: Jul 2010
Location: Pennsylvania
Posts: 1,100
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Re: Brake light problem
Do you have a turn signal installed that works on the original brake light bulbs? If so, the brake lights are wired through the turn signal wiring harness, and you may have some wires crossed up.
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01-17-2020, 12:24 PM | #12 | |
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Join Date: May 2010
Location: So Cal
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Re: Brake light problem
Quote:
Most likely a bad ground. |
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01-17-2020, 03:18 PM | #13 |
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Join Date: Aug 2012
Posts: 886
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Re: Brake light problem
I say bad ground.
That's 4 votes for bad grounds now...
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