turn signals stopped working, just the indicators Options

[malcolm2]

This happened to me before. I wish I could remember what I (or we) did to fix it. I did a search for my posts and it did not jump out at me. So if anyone remembers, or has recently repaired this, speak up....

OK here is the deal. I activate the turn signal lever and sometimes the dash indicator will blink twice. Most times not.

I don't hear a CLICK when they do work.

The Hazards do the same thing.

The fuse is fine.

The parking feature works fine on either side. Does everyone know that when the key is off and out, if you activate the signal lever, the lights come on on that side?

Let know...

[Spoke]

From what you mentioned, sounds like there are 2 issues. Please correct me if I'm mistaken.

1) Left turnsignal indicator flashes on right turnsignal and Right indicator on left turnsignal. This is to be expected with EP26. Has more to do with the way Porsche wired the R and L indicators. See the top diagram below.

Notice the LEFT indicator is connected to the RIGHT turnsignals and RIGHT indicator to the LEFT turnsignals. This is OEM. The OEM flasher connects pin K to 12V when flashing. For example, if the LEFT turnsignal is active, pin K is 12V and current flows through the LEFT indicator through the RIGHT turnsignal bulbs. Turnsignal bulbs are much less impedance and do not turn on, only the indicator turns on. This secondary relay connecting to pin K loses efficiency over time and doesn't work correctly as you have observed.

With EP26, see bottom diagram. Now pin C2 (similar to K) is connected to ground. So now the LEFT indicator flashes with the RIGHT turnsignals. To fix this, pop out the tach and take the entire indicator assembly out, bulb and all and swap L to R.

2) Brake warning flashes all the time. Notice 2 switches; one for the e-brake and one for the MC. One of these wires is grounding at all times. If both switches are open, the brake warning bulb cannot light. Try disconnecting the MC wires then test. If still flashing, try disconnecting the e-brake switch. One of these 2 are always providing a path to ground for the warning light and flasher.

[Minerva's 914]

2) Brake warning flashes all the time. Notice 2 switches; one for the e-brake and one for the MC. One of these wires is grounding at all times. If both switches are open, the brake warning bulb cannot light. Try disconnecting the MC wires then test. If still flashing, try disconnecting the e-brake switch. One of these 2 are always providing a path to ground for the warning light and flasher.




[/quote]

Okay, finally back on it this morning. Issue #2, brake light flashing all the time.

I disconnected both of the switches and the light flashes all the time. Actually, I disconnected the e-brake switch because the m/c switch is the wrong single pole switch (correct duel circuit on order but has not arrived yet) so that has been disconnected as far as I know since the car came back from restoration and the shop installed a new m/c.

I further tested the e-b switch and it makes and breaks continuity so it appears to function normally.

Testing the wires at the m-c switch, the brown wire has continuity to ground but the brown / white stripe wire does not, is that right?

Where would I look next, think there is a ground fault somewhere? I've cleaned and inspected the grounds behind the fuse panel and at both headlights,

Thanks again for all your help.

[Spoke]

2) Brake warning flashes all the time. Notice 2 switches; one for the e-brake and one for the MC. One of these wires is grounding at all times. If both switches are open, the brake warning bulb cannot light. Try disconnecting the MC wires then test. If still flashing, try disconnecting the e-brake switch. One of these 2 are always providing a path to ground for the warning light and flasher.

Okay, finally back on it this morning. Issue #2, brake light flashing all the time.

I disconnected both of the switches and the light flashes all the time. Actually, I disconnected the e-brake switch because the m/c switch is the wrong single pole switch (correct duel circuit on order but has not arrived yet) so that has been disconnected as far as I know since the car came back from restoration and the shop installed a new m/c.

I further tested the e-b switch and it makes and breaks continuity so it appears to function normally.

Testing the wires at the m-c switch, the brown wire has continuity to ground but the brown / white stripe wire does not, is that right?

Where would I look next, think there is a ground fault somewhere? I've cleaned and inspected the grounds behind the fuse panel and at both headlights,

Thanks again for all your help.

So both switches are disconnected and the brake warning light still flashes.

The diagram below is adjusted to reflect the switches removed. If the lamp is still flashing then there is a leakage path to ground as shown in the diagram. The electrons flowing through the lamp have to be going through something to ground.

Try this test:
1) Remove the brake warning bulb.
2) Determine which wire is going to the flasher and which is going to the switches. We want the wire going to the switches. To determine which wire is which, turn on the 4-ways and measure the voltage on each wire (to chassis). The one from the flasher will be pulsating 0 - 12V - 0 ...
3) Now measure the resistance of the other wire to chassis. This should be infinite. If you measure any appreciable resistance (< 1000 ohms) you have a shorted wire.

Maybe check the wire under the seat since it is more exposed than the MC brake wires.

Also, about the switch for the MC, the single pole and dual pole switch are identical in function and can be interchanged. The single pole shorts to ground through the MC and thus the 2nd wire (ground wire; brown color) is not used and can be left hanging.