The Stovebolt Site Forums The Parking Lot '60-'66 Trucks '60 C10 turn signal problems - Please Help!

Hi all,
As a new owner of a '60 Chevy C10 1/2 ton, I have a problem that I don't know how to solve or even where to look. I need "Stovebolt Chevy Guru" help please.

The problem appears to be a turn- signal issue but could be a wiring problem inherited from the previous owner. The conditions are as follows...

> Turn signal indicator in dash flashes at normal rate when signal arm is in center position as well as when moved to L or R position.
> the front signal lights do not flash at all but do work when used as running lights
> The left rear flashes always (like a hazard light) but the right doesn't * see note
> the rear right break light works but not the left. * see note

* note: the harness from the console harness to the rear bulkhead connector has 3 contacts. The black (1 of 3) has 12 v only when lights are on so I assume this to be tail lights which connect to the smaller tail light lamp filament. I assume the other two (wires are violet and pink) contacts at the bulk head connector are (2) L break /signal, and (3) R break / signal lines (larger tail light filament.)

> With the flasher unit unplugged and foot on the breaks, the meter sees voltage only at one contact (2 of 3).
> With the flasher unit is plugged in, meter sees "flasher" voltage on other contact (3 of 3).

so... the turn signal arm the same in all three positions... and the left rear light always flashes like a hazard light and only the right rear break light works but without signal light, and the front signals don't work at all.


To try and fix the problem:
> Since there was no wiring under the bed, I installed three new 18 ga wires from the rear bulkhead connector beneath the cab (floor of the cab / driver side) to the tail light area.
> All 3 wires check out with a continuity meter from inside the bulkhead floor connector.
> I split the black line (1) to the small filament as the tail. These work fine.
> I hooked line 2 to the L larger filament and line 3 to the R larger filament.
> To eliminate socket grounding issues I installed separate ground wires from each tail light to the body with a taping screw and did the same for the front running lights to the hood.
> all bulbs and each filament checked out good with meter.
> I installed a new flasher unit

Where do I look next????


As a temporary fix I keep the flasher unit out and split the "break light" voltage on one line to both tail light larger filament so I at least have break lights but want the turn signals to work and for it to be working correctly.


All insight and help will be very appreciated.
Best
QnL