Signal Lights

Doc69 · Veteran Member

Signal Lights

65 SD L79 · Canadian Poncho Superstar!

try pulling out the bulb from the front socket and see what it does

65 SD L79 · Canadian Poncho Superstar!

also try turning on parking lights and see what it does

ABC123 · Uber Guru

Let go with the KISS idea

Unplug the rear harness by the top of the left 1/4 panel and see what happens with the front signals.

Those rear harnesses take a beating and the left/right hots could be together.

Also, a live wire could be feeding that silly ground wire that feeds across the lights.

Also, the convertible harnesses get wrecked under the back seat.

I can lend you a few parts to try but be careful.

The next 69 Guru to show up at my house, will have to help me change my turn signal cancel plate biggrin

My mending arm just doesn't have the strength and my hand doesn't have the dexterity for that yet.

Doc69 · Veteran Member

Bulb out had no effect
Parking lights on signals stop flashing.
I have no idea whats going on now. Thats a new variable

Doc69 · Veteran Member

Unplugged the rear harness. Killed everything up front and obviously in the rear as well

ABC123 · Uber Guru

Strange,

I just unplugged my rear harness and it only killed the rear.

unruhjonny · Guru

there should be a seperate ground for the rear and the front lamp harness - maybe this is a ground issue?

Doc69 · Veteran Member

I cleaned all of my grounds front and back now I have no issues with any lights going out when headlights or parking lights are turned in but now absolutely no signal lights. I am suspecting that the signal mechanism is the culprit I will try replacing that and then see where I stand

North · Guru

remember that there are two different flashers, one for the turn signals and another for the hazards. One is on the fuse block and the other is usually on the bottom of the dash outboard of the steering column.

seventy2plus2 · Canadian Poncho Superstar!

North wrote:
remember that there are two different flashers, one for the turn signals and another for the hazards. One is on the fuse block and the other is usually on the bottom of the dash outboard of the steering column.

Good point John. The flasher on the fuse block is for the 4-ways, whereas the flasher for the signal lights should be in a little clip tucked up under the dash, kind of below the wiper switch.

Doc69 · Veteran Member

I swapped out the whole signal mechanism and still an issue. If I short out the terminals on the canceling linkage to ground they, the signals all work correctly . The only grounds I havent taken off and cleaned are the ones on the front rad support. Any other suggestions?

65 SD L79 · Canadian Poncho Superstar!

what about the rag joint ground?

Doc69 · Veteran Member

I never knew about that one. How do I test that, where do I test that?
That makes sense since like I said when I ground out the terminals on the signal mechanism they work I just dont understand how you can ground the rag joint

65 SD L79 · Canadian Poncho Superstar!

try googling rag joint ground

seventy2plus2 · Canadian Poncho Superstar!

Doc69 wrote:
I never knew about that one. How do I test that, where do I test that?
That makes sense since like I said when I ground out the terminals on the signal mechanism they work I just dont understand how you can ground the rag joint

I presume you have the steering wheel off.

To test I'd run a jumper from a ground source to the center shaft of the steering column. That should be a decent test unless someone else has a suggestion.

seventy2plus2 · Canadian Poncho Superstar!

seventy2plus2 wrote:
Doc69 wrote:
I never knew about that one. How do I test that, where do I test that?
That makes sense since like I said when I ground out the terminals on the signal mechanism they work I just dont understand how you can ground the rag joint
I presume you have the steering wheel off.

To test I'd run a jumper from a ground source to the center shaft of the steering column. That should be a decent test unless someone else has a suggestion.

I got thinking about this, and I don't think the signal light switch needs a ground. However, the rag joint ground is required for the horn to work.

I presume when you say the "signal mechanism", you mean the signal light switch.

-- Edited by seventy2plus2 on Sunday 10th of September 2023 12:21:23 PM

Doc69 · Veteran Member

Yes the signal light switch. I still cant figure this out. I am at a complete loss

seventy2plus2 · Canadian Poncho Superstar!

A couple things to try:
-What happens when you push in the hazards switch, both with the ignition on & off? The signal lights should flash with ignition on & off, except I think when the brake pedal is pushed.

-Have you changed the signal light flasher? It's not the one on the fuse block, it should be in a clip under the dash kind of below the wiper switch. Or it might be hanging loose.
The flasher on the fuse block is for the hazard lights.

Doc69 · Veteran Member

Hazards on they work somewhat correctly. Front parking lights front and rear side marker lights all three tail lamp bulbs and fr license lamp flash at the same time and at an increased speed like when emergency flashers are activated,Ignition on and off no difference brake pedal pushed they stay on solid. Pretty sure not all of these lights should be flashing. When Headlights and or just parking lights are turned on they go all go out
Swapped the flashers now I have rh signal lights that work correctly I think, ie rh front parking light and rh rr outside two of three bulbs in the taillight flash as I think is normal for the signals flash is normal speed and no side marker lamps flashing.
Turn on lh signal light and it behaves the same as with the emergency flashers activated including faster then normal flash speed
I have ordered two new flashers to replace old existing flashers. They will arrive by Sunday
Maybe that will correct the issue, as the flashers in it are definitely from the 70s.
Any other ideas I am open to any and all ideas
Thanks again

seventy2plus2 · Canadian Poncho Superstar!

Hopefully someone with a 69 can comment as to what is supposed to flash when on hazards or just signalling as I'm really not sure what the front & rear side marker lights are supposed to do.
On my 70, I don't have front side marker lights (just a reflector built into the side of the front signal light lenses), but the rear side marker lights are only running lights.
Also you mention the 'fr license lamp', do you mean the rear license lamp?

Doc69 · Veteran Member

Sorry yes the rear license lamp. Fat fingers hit the f instead of the r

gtodrive · Guru

Yes, front parking, front side marker, rear side marker, taillights, and rear license plate light all flash.

seventy2plus2 · Canadian Poncho Superstar!

gtodrive wrote:
Yes, front parking, front side marker, rear side marker, taillights, and rear license plate light all flash.

Thanks Rob, I presume you mean they all flash with the hazard light button pushed.

What about when signalling? Do the marker lights (either front or rear) flash? My 72 GMC, the front marker lights flash when signalling, but rear marker lights are only marker lights.

ABC123 · Uber Guru

The side marker lights are one way only.

They do not flash unless rewired to do this.

They are just marker lights.

I would start all over with this.

Unplug the front wire harness from the firewall.

Then,

Test to see if each connection works with a testing light.

When the left turn signal is on, only one circuit port will light up.

If this happens, you have ruled out anything under the dash.

-- Edited by ABC123 on Wednesday 13th of September 2023 08:22:11 PM