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So I have an electrical problem on my 69. No brake light on pass rear and no turn signal either. Only have the low bulb illuminated. I have checked the harness and bulb and all grounds of course. My meter tells me that contact has no juice. I am told this is common if your blinker mechanism is broken. So I have the wheel off and all the guts exposed. Before I replace the mechanism is there a way to tell for sure this is the problem?
I'd probably get a replacement TS switch, then unplug the original at the long harmonica plug. Plug the new one into the harmonica plug and work the switch by hand while it's off the column and free. You'll have to check your wiring diagram to see if some part on the switch has to be grounded to work while off the steering column. Good luck with this.
Duane
I do have very good "clicks" both ways, and it does cancel properly. One thing I see is a lot of grease on the mechanism. Doesn't look like dielectric just regular bearing grease
You could check the brake switch on the brake pedal first. It could be bad or out of adjustment, easy. I just had mine fail.
You could have 2 failures. Check to see if there are nonoriginal splices at your rear lights. I had a light that wouldn't go on. There was a splice and electrical tape. Even though the wires were twisted around each other, they weren't making contact.
Do not use dielectric grease on electrical contacts,,,, it doesn't conduct electricity.
Brake switch is good - I have brake light on driver side.
so can I probe the Dark green wire at base of column? That is the pass side brake light I think
1. Dark green wire at rear harness for right tail light shows no power at anytime or function. Left tail light is all working properly..
2. Dark green wire at the signal switch shows no power at key on or key off. 12 V at brake pedal depressed and 12 V at left turn signal but is constant (even though the lights are blinking properly)
3. Same wire has no power at right turn signal.
4. Blinker mechanism under the dash works fine on left turn signal but nothing on right signal.
So does this sound like a faulty signal mechanism?
Wait a minute I might be smoking crack. So if my dark green wire leaving the turn signal switch EVER has 12 V and my pass rear brake light isn't illuminated, I must have a break in the green wire somewhere along the way. So what is the harness routing from the brake pedal area to the light socket?
I'd look at the 12 pin connector at the top /side of your fusebox-
Runs to the rear of your car. Disconnect it- and it isolates the rear lights from the car- the best way to really test the rear lights - Also eliminating taking apart stuff randomly.
Make a 12volt 'test' wire- simply a wire with fuse from the battery to test a circuit. see pic- I used heat shrink- electrical tape will work- or you can get a wire with a fuse holder at the auto-parts store
You can put power on the wires and test each circuit-
Looks like I wasted everyone's time.
Was chasing my tail - after RECHECKING stuff with my meter all of a sudden I DO have correct readings at the bulb sockets. Even with clean shiny terminals and such, I was getting dead readings that are now the opposite. And though the harness had the proper ground wire coming from the backup housing, and the connection good solid and clean, it just wasn't giving a ground. When I jumper grounded the housing all works proper. Thanks for the help
04-19-2021, 07:43 PM
How to test turn signal mechanism
