I hope someone can shed some light on my problem that has me stumped. I have a 1974 charger and the other day the turn signals stopped working, i found a blown fuse and replaced it. i turned the key to the on position and the signals worked. Once the car is running the fuse blows. I replace the fuse again and put the signals on again with the engine off and they ran fine. as soon as the car is running the fuse blows. Anyone have an idea what to look for? I'm stumped.

Thanks

I would start by following the signal wires from the bulbs look for a bare spot that's touching metal and shorting. My guess would be up front where there are some turns in the wire through metal around rad support area.

seperate the TS pull apart harness & ohm the different harness wires to ground as you shake/move the column/st wheel & see if any of this gives you a dead short. Do it with the TS stalk up and down. Always a good idea to pull a batt cable off before you switch the meter to ohms.

You can buy circuit breakers that fit perfectly into glass fuse location in your fuse box.

Will give you time to sort this out without having to replace a whole lot of fuses.

Also there is a hand tool that I own just for this type of troubleshooting. I believe it is called ‘fusebuddy’. Amazon has them. The circuit breaker fuses are almost as good and much cheaper.

It turns out that the back up bulbs went bad and that was the cause of the fuse blowing. Very strange.

the single filament backup bulb (one of em I am assuming) was grounded internally? Not sure how that affected the TS fuse but if it is all good then it is all good.

I guess the backup lights share the same fuse. It stumped me for a while. I'm glad it was an easy fix.

Thanks for posting the cause

That is really strange that THAT would blow the fuse.