turn signals acting weird when lights are on

[ChargerST]

I recently upgraded my headlights to relays and also added parallel wiring. Another mod was that I had to add extra rear turn signals (mandatory here). Just ran an extra wire from the brake switch to the brake lights and cut the white wire going to the turn signal switch. Turn signals now use the old brown and green wire. Everything worked as it should but since I had the car at a repair shop for setting the ignition timing the turn signals won't properly function when the lights are on. Also the brake lights don't work anymore but the fuse looks good.
When the lights are off the turn signals and hazards work properly. Sounds somehow like a grounding issue?

Can a bad fusebox connection cause the brakelight problem while not melting the fuse?

[2Gunz]

Ya...........

If Im following what you said you did, there is zero chance this ever worked correctly.


For starters the "bright" half of the bulb in back is Stop AND turn signal. The "running" lights are a completly different circuit.
So if you just wire the brake light switch to it you will lose your turn signals.
If you wire the brake light to it AND leave the old wires in place its going to do some wacky stuff.


Im assuming your trying to do rear side marker lights that act as turn signals and running lights?

The best way I can think of to do this (without looking at the wiring diagram) is to wire it back to normal.  Get it working like that.

Then run 3 wires (left turn, right turn, running lights and put the ground to the chassis)  from the front lights.

The front lights are a much closer match wiring and function wise to what you are trying to do.



It is possible to do what you are trying to do off the tail lights. Anything is possible.  But at the very least its going to take some crafty wiring and possibly a few relays.



**** side note here ****

If you are tying to do a running light , turn AND brake light thing..... thats easy just tap into the existing dual filament bulb in the brake light.



Good luck

[ChargerST]

Thanks for your reply.
I actually checked my wiring today and it seems that my brake light switch doesn't work.
The setup I described worked fine till I had the car at the repair shop.
Maybe I wasn't clear enough on my setup:

cut the white wire at the brake light switch and hooked the switch to a new wire going to the back. This new wire is only connected to the brake light filament (the bright lights not the running lights). This gives me the brake lights
The original brake/turn signal wires are brown and green. Because I cut the white wire there is no brake signal on the wires anymore just the turn signal. I disconnected the brown and green wires from the bulbs and ran them to new turn signals that are mounted under the bumper.

I'm gonna change out the brake light switch and see how it goes.