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Brake and Directional s not working intermittently
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JimBrennan
Posted 2019-03-31 9:28 AM (#580169)
Subject: Brake and Directional s not working intermittently


Member

Posts: 18

I have a problem that I haven’t experienced before. We have a 1956 Plymouth Belvedere convertible with a 277 V8. When I took it for a ride I realized I had no brake lights and no directional lights, or at least that’s what I thought. What I discovered was that if I rev the engine the right directional will flash until the RPMs drop. That does not appear to happen with either the brakes or left directional which would appear to rule out a fuse problem.

Any suggestions on what I should be looking for?

Thanks for the resource

Jim B
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56D500boy
Posted 2019-03-31 10:53 AM (#580173 - in reply to #580169)
Subject: RE: Brake and Directional s not working intermittently



Expert

Posts: 4518
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Location: Lower Mainland BC
The function of the rear running, signal and brake lights (three things, only two filaments in the rear bulbs) is controlled by the turn signal switch. If the signal switch is in neutral (no left, no right turn), the running light filament can be on (controlled by the headlight switch) and the brake lights will function when the brake pedal is pressed (assuming that the brake switch on the master cylinder is working). HOWEVER, when you pull down (left turn) or push up (right turn) on the signal stalk, the priority for the second filament in the rear bulb is mechanically set by the signal switch to be that signal (as modified by the blinker). That side brake light no longer functions until the turn is completed and the signal is cancelled.

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Powerflite
Posted 2019-03-31 11:08 AM (#580175 - in reply to #580169)
Subject: Re: Brake and Directional s not working intermittently



Expert 5K+

Posts: 5266
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Location: So. California
You have more resistance in the right side than the left which is likely caused by corroded connections. Check them, clean them, and use dielectric grease on them. The corrosion causes your flasher to require more voltage to operate properly. It could be that your system voltage is starting to die. Check the voltage of the battery when the car is running. If it is at least 13.5 volts, then the generator is fine. I recommend that you replace the flasher with an electronic one you can purchase from any parts store. They are better able to operate with less than ideal conditions.
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JimBrennan
Posted 2019-04-06 9:30 PM (#580469 - in reply to #580169)
Subject: Re: Brake and Directional s not working intermittently


Member

Posts: 18

Thanks for the suggestions Replaced the flasher unit with no success. The voltage exceeds 13.5 and I've removed and cleaned the battery cables. As for the brake light switch I replaced that with a mechanical one years ago because I have silicone brake fluid and that's seemed to short out the switch on the master cylinder. There is no longer any directionals or brake lights. Guess I'll have to start tracing out the wiring
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