Troubles with Turn Signals 67 Barracuda

inertia said

There is a phenomenon in Mopar wiring, iirc, if the wipers?, heater?, brake-lite (pedal depressed)?, 4-way?, are all activated with the key off, the 4-way will intermittently power all the for-mentioned+ stuff, -

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Simpler than that.

Key out of ignition, Flashers on, turn signal left or right and press the brake, listen to the radio!

There is back feeding going on here and a high current device might make a low current device a fuse. So go easy and don't over do it.