Turn signal indicator lights come on with key Options

[GeorgeKopf]

I'm wring my 1973 wiring harness and have a bunch of things installed which seem to be working correctly (i.e. headlights (high & low beam), headlight motors, turn signals, running lights, tail lights)

But (IMG:style_emoticons/default/bootyshake.gif) the turn signal indicators are always on!

I've traced the flow of current from the fuse panel (red with white stripe) to the hazard switch, from there (red) to the relay and from there to the turn signal indicators (blue with white stripe).

47 is the relay
31 is the hazard switch
22 is the turn signal lights
26 is the steering column switch


I have two relays and both seem to work fine. When I pull out the hazard switch the indicators and lights all blink. When I set the turn signal that side blinks.

I have two hazard switches and both behave the same way. As soon as I connect the red and red/white wires the turn signal indicators come on.
With the knob pushed in, I have continuity between the red/white (power in) and the red (power out to the relay).
With the knob pulled out, I have continuity between the black/red (power in) and the red (power out to the relay). (IMG:style_emoticons/default/confused24.gif)

More information:
I have cleaned all grounding studs.
I disassembled one of the relays and cleaned it.
If I disconnect all of the wires from the hazard switch except for the red/white and the red, the signal indicators come on and stay on. Doesn't this mean that my relay is bad? It should be getting power so that it can feed the turn signal indicators when the turn signals are set.

It seems that the relay is allowing the input power to the blue/white wires when it shouldn't.

If so, is there a good way to test or repair them?

Thanks in advance for any advice.

George

[GeorgeKopf]

@Spoke

If I remove the flasher relay, the indicators do not come on with the key.

With the flasher relay installed, I get power on the blue/white wire to both indicators.

Also, disconnecting the turn signal switch didn't make any difference.


Thanks.

George

[Spoke]

@Spoke

If I remove the flasher relay, the indicators do not come on with the key.

With the flasher relay installed, I get power on the blue/white wire to both indicators.

Also, disconnecting the turn signal switch didn't make any difference.


Thanks.

George

I would expect the indicators to be off with the relay removed. Quite honestly, I'd bypass the K/C/C2 pin on the relay and just ground the common connection of the indicators to the tach ground. I did this on my '71. I'm still using the OEM flasher with all LEDs with no issues.

If you do change to external LEDs the function of K/C/C2 is lost. K/C/C2 is active in the relays as a safety feature to alert the driver of a burned exterior turnsignal bulb. If a bulb is burned out, the relay will not power K/C/C2 during flashing and both indicators will flash together indicating a burned bulb.

An easy workaround which I did on my 914 is to remove the common wire at the indicators and tape them off. Then make a pigtail like shown below. The piggyback connector goes under the tach ground (brown wire) and the 2 female spades go to each indicator. The indicators will flash opposite (L on for right turnsignal; R on for lefts). This is easily fixed by pulling the entire light assembly out and put it in the opposite hole.


Here's spades for the mod. This is the ground piggyback connector. You need 1 of these.
Piggyback Spade

This is for the bulb spades. You'll need 2.
Female Spade