'64 turn signal problems

[bwilliams35]

I am having a problem with the turn signals on my '64 C10. the switch is new and the lights did work but quit suddenly. Tail lights work but only the right brake and none of the turn signals, front or rear. All bulbs are good. Could this be a ground issue?

[panhandler62]

Anyone have a wiring diagram for a 64?

[VetteVet]

Oh Ye of little faith;

Here is the engine side of the firewall and the connector to the rear lights.



This is the inside cab wiring showing the fusebox and the turn signal switch connector. The purple ( light blue) wire from the fuse box feeds 12 volts to the TS switch.See the purple arrow and the black arrow.



Here is the tail light harness from the engine side of the firewall to the rear lights.

[bwilliams35]

Thanks for the replys. I traced it down to a bad connection. Was only getting 5 volts at the flasher. Re-wired the connection and all is good now.

[SuperDuperDoughnuts]

Semi related...

On the turn signal switch wiring (the switch itself) if I move the lever for a left turn, I should get continuity across green and light blue, correct? My left signal has stopped working and I suspect it's the switch. No clicking relay or nothing. Just dead, hence why I suspect the switch

[VetteVet]

If you take a look at my second diagram above, it shows the directional switch wiring in the second group from the top. GM used the same wiring colors in most of its vehicles in the 60s and 70s.
The power feed wire for the turns is purple.
The left turn is colored yellow.
The right turn is dark green.
The right front signal is dark blue.
The left front is light blue.
And the dash indicator is also blue.

The respective wires should show continuity at the switch between the front and rear signal lamps. When the selector is moved to left turn you should have continuity between yellow and light blue. And right tun gives continuity between dark green and dark blue. The hazard switch will give continuity between all four.
If you have an indicator in the dash cluster it will show continuity as well.
It appears that the wiring is crossed between the dark green and yellow wires at your switch connector or in the switch itself.
What does a fight turn give? if you get the dark green and dark blue wires then the front signal wiring is ok and you may have the rear wiring crossed.
Hope this helps. VV

[SuperDuperDoughnuts]

Thanks! I managed to figure it out. Ended up being a poorly installed bulb at front left. Ended up discovering I had power across purple and light blue, which led me to believe it something was loose. The bulb just wasn't fully seated in the socket; fixed it and works great.

Didn't realize that would cause the the blinker to stop clicking completely.

[VetteVet]

thanks for the feedback, it may be useful to others. One other thing that that may happen to cause a crossfeed is a bulb filament that burns out and the filament wire bends over and touches the parking light filament