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> Electrical Diagnosis, Lights, Brake Light and Flashers
Highland
post Jan 14 2025, 09:21 PM
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2 issues:

1) When I brake the front turn signal goes on along with the brake lights.

2) The flashing parking brake indicator also causes both left and right turn signal indicators to flash.

From what I can tell from the electrical schematic both tie into the emergency light switch.

Just wondering if I could get some advice before I pull the emergency switch to inspect for defects.

Flashing relay is new.
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Spoke
post Jan 19 2025, 09:47 PM
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The brake/running light dual filament bulbs in the rear are the only place the brake and running light come together.

If the bulb is not grounded, hitting the brake will set a path from the brake filament through the running light filament and terminates in the front turnsignal dual filament bulb.

With brake on, check if both filaments in the brake bulb are lit.
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Highland
post Jan 20 2025, 08:55 AM
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QUOTE(Spoke @ Jan 19 2025, 07:47 PM) *

The brake/running light dual filament bulbs in the rear are the only place the brake and running light come together.

If the bulb is not grounded, hitting the brake will set a path from the brake filament through the running light filament and terminates in the front turnsignal dual filament bulb.

With brake on, check if both filaments in the brake bulb are lit.


Thanks for the clarification. Seems like the filaments are activating when they should. One on with parking lights, 2 on with brake and pedal depressed.

But discovered that with ignition off (key out) and right parking light on, when I press the brake pedal the ignition goes on (pump and gages activate).

This only happens with the right parking light, not when left only is activated.

Also when I turn on the left parking light only the left side turns on. When I turn on the right parking light, the right side and rear left turn on.

Maybe a short in the turn indicator switch? Where should I start looking?
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Spoke
post Jan 20 2025, 10:48 AM
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Jerry
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QUOTE(Highland @ Jan 20 2025, 09:55 AM) *
But discovered that with ignition off (key out) and right parking light on, when I press the brake pedal the ignition goes on (pump and gages activate).

This only happens with the right parking light, not when left only is activated.



It still seems like the right brake light ground is not there.

Here's my thoughts:

Ig off, RT turnsignal on (right running lights should light; they are), brake depressed: Ig ON.

OK if there is no ground on the right brake light, with ig off and RT turnsignal on, power is to the running light filament. w/o ground, the running light filament (connected to the brake filament in the bulb) powers the brake filament which is connected to the 914 electrical system through the depressed brake pedal and (sort of) powers the system.

Check this by pulling the right brake bulb and retesting.

It may be prudent to clean the socket. It can be done with a small screwdriver. Just scrape the socket walls and the buttons being careful not to put much pressure on the buttons.
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