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Brake light switch and the disappearing voltage?
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   Forward Look Technical Discussions -> Brakes, Wheels and TiresMessage format
 
ABloch
Posted 2019-04-01 1:14 AM (#580222)
Subject: Brake light switch and the disappearing voltage?



Elite Veteran

Posts: 1115
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Location: Pacific Northwest
Newly acquired 1956 Fury that has the brake light switch relocated to the brake pedal. Wire number one goes to the brake lights. Grounds are good and if I run power direct from the battery they both light up.

Here is the mystery... The second wire shows 12v. to the switch. Once the pedal is depressed and the switch activates the voltage disappears. If I disconnect the wire and touch it to ground one would expect a spark. Nothing. When testing for continuity I am unable to trace where the phantom 12v is coming from.

I am fairly adept at wiring. I am using a Fluke multimeter (set on DC) Battery shows 12.7v at the terminals and 12.2 at the switch. Being a '56 most of the wires I see under the dash are ALL beige cloth so trying to find the red from the circuit breaker atop the headlight switch is not working out for me.

I have come to the collective to seek guidance.....Anyone have any suggestions?




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58coupe
Posted 2019-04-01 11:32 AM (#580246 - in reply to #580222)
Subject: Re: Brake light switch and the disappearing voltage?



Expert

Posts: 1375
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Location: Alaska
The #2 wire should be hot all the time but it has too much resistance to light the lights most likely from a poor connection. It will read 12 volts when no current is flowing but will not allow it to flow enough to light the lights.
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