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Check the ground on the flasher itself also.

Disconnect them all. Start with making sure they are all grounded well. Put the lights switch to headlight and the hazards on. Go to the back lights with your test light find the flashing one that is brake/turn and there will be one that is constant on that goes to the tail light running light...

Something has to be miswired I would check the rears first even though they appeared to work. The led lights were not designed for deuce or 5tons the numbers may match on the wires but they are not always the correct match. The test light will tell all.

You may have switched a connection on one of the lights. The led lights require a separate ground also. I know on the 5ton the numbers on the harness for the tail lights match the numbers on the lights wiring but they are not accurate. Disconnect your back lights use a test light to figure out...