HELP!!! Electrical Issues...
 

Car: 2003 Mustang GT - Manual Transmission

Issue: Would any of you happen to know what would cause the following systems to fail: Turn signals, brake lights (only center brake light works) emergency flasher, rear running lights, and dash lights to all fail? It seems to be degenerative, i.e. each failed one after another within a (2) day period of time. I've checked all the wires, bulbs, fuses and even replaced the flasher relay and the issue persists. What other relay or part would be related to this type of failure? Any help in the right direction would be much appreciated, thanks!

Still need help, anyone out there have experience with this stuff or a clue as to what could tying all these systems together to cause a common failure such as this? Thanks!

What was the last thing you installed? Anything happen prior to that?

I am guessing here, but I wonder if you maybe installed a Sequential Turn Signal setup, not the PnP ones, but the ones were the circuit board is spliced into the rear lights...

I had that setup on a car one time, and had to revert it back to stock wiring diagram...cause similar problems

Haven't installed anything lately except for the reverse glo gauges, but that was simply connected to the chassis ground and then power to my stereo's remote line so it would go on with the car. And that's been working for the past 2 weeks without an issue and has since been removed during the troubleshooting. I don't see how it could be related though, it doesn't even touch those systems and my stereo works just fine.

just a thought...