No brake lights or rear turn signals

retroron said

I'm not an expert on MOPAR wiring, but if the front front blinkers and tail lights are good I'd be looking for a broken wire.

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I didn't catch that part. Your right if the front is good, it has to be in the rear harness. It runs down the left side inside. Should be a plug there at the left front kick panel, unplug it there and test the harness at the plug with a test light.