1975 914 brake light/turn signal question....with video!, Update: Video added...see latest post Options

[billh1963]

Started working on getting Mark's "BB" ready for Okteenerfest and have started sorting a wiring issue. The turn signals weren't working and after replacing the turn signal relay and turn signal switch to no avail I figured it had to be the flasher switch itself. After replacing the switch (thank you Dominic), I know have hazard lights and turn signals. However, I now have the following questions:

1. I have a burned out right turn signal bulb. Will that cause the yellow turn signal indicator light on the tachometer to stay illuminated? (see picture) I don't have a spare at the moment to see if changing it solves the issue. Current;y, it stays on

2. I don't have an owner's manual. What is the other light on the right side of the tachometer (not illuminated)? It does not illuminate

3. I replaced the turn signal relay with the Wehr brand relay. However, I am still getting the buzzing and fast blinking on the brake light that has been attributed to the relay. I have read that the emergency brake handle and/or needing to reset the MC pressure switch will cause the light to illuminate. In my case, the e-brake handle is down so I will try resetting the MC switch tomorrow. Anything else I should take into account that may cause this condition?

Thank you

[billh1963]

Great drawing! I think you are right, however, help me think this through...

First answer....pushing in or releasing the ebrake switch has no effect

I replaced the four way (hazard) switch because it had literally fallen apart. Once I did that, the hazard lights work correctly.

Since the turn signals work as well (appropriate lights work with the switch), I'll assume the following:

1. Fuses 9 and 11 are good and the red wire from the 4 way switch to the flasher relay is good and not shorted

2. The wires from the 4 way flasher to the turn signal switch are good (BK/GR/WH, BK/GR, and BK/WH) and connected correctly

3. Connections to the turn signal bulbs are correct (LR, LF, RR and RF)

4. The master cylinder warning indicator and emergency brake indicator are two separate lights or is there only one? I'm assuming only one and that is activated by the master cylinder warning switch and/or the emergency brake handle switch closing

So, looking at the drawing I see that I must have constant voltage being applied to the L-R turn signal indicator and the emergency brake/master cylinder warning indicator for both to be on simultaneously.

I just replaced the flasher relay...could it be bad?

If not, then, as you said, either the ebrake switch or master cylinder switch is closed (or their wire is shorted).

Thank you for the drawing. I'll check those possibilities next!

[Spoke]

Great drawing! I think you are right, however, help me think this through...

First answer....pushing in or releasing the ebrake switch has no effect

I replaced the four way (hazard) switch because it had literally fallen apart. Once I did that, the hazard lights work correctly.

Since the turn signals work as well (appropriate lights work with the switch), I'll assume the following:

1. Fuses 9 and 11 are good and the red wire from the 4 way switch to the flasher relay is good and not shorted

2. The wires from the 4 way flasher to the turn signal switch are good (BK/GR/WH, BK/GR, and BK/WH) and connected correctly

3. Connections to the turn signal bulbs are correct (LR, LF, RR and RF)

4. The master cylinder warning indicator and emergency brake indicator are two separate lights or is there only one? I'm assuming only one and that is activated by the master cylinder warning switch and/or the emergency brake handle switch closing

So, looking at the drawing I see that I must have constant voltage being applied to the L-R turn signal indicator and the emergency brake/master cylinder warning indicator for both to be on simultaneously.

I just replaced the flasher relay...could it be bad?

If not, then, as you said, either the ebrake switch or master cylinder switch is closed (or their wire is shorted).

Thank you for the drawing. I'll check those possibilities next!

There may be only one brake warning light. The issue is with the light circuit, likely not the flasher. To test, remove the brake warning bulb and see if the buzzing stops.

If the buzzing stops when the bulb is removed, either the MC brake warning switch is on or the ebrake switch is stuck.

[billh1963]

There may be only one brake warning light. The issue is with the light circuit, likely not the flasher. To test, remove the brake warning bulb and see if the buzzing stops.

If the buzzing stops when the bulb is removed, either the MC brake warning switch is on or the ebrake switch is stuck.

Pulled the bulb and the buzzing stopped. I pushed in the brake master switch but it had no effect. Next check is ebrake switch!