Electrical Help

You turn on the 4 way flashers, hold down the brake, and turn on the radio. These circuits all interact in such a way to backfeed the radio
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That was me.
Just for old time sake I tried that trick out again on the Dart just now. It didn’t work. However, I have made several modifications to this car’s wiring harness adding relays, performing a Mad amp gage bypass and others. The back feed path has been plugged I guess.