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Some flashed, some did not.
I've had 2 '70 chevys now, and the 3/4 ton flashed...but the one ton does not. Both harnesses were untampered.
To make it flash, run the ground wire from the side marker to the turn signal wire on the front marker. When the tun signal is not powered, it acts as a ground...and when it is powered, the ground is intureupted.
The rear ones never blinked.
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