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Need picture of turn signal relay wiring 79 DOHC

If your using the original type of flasher it shouldn't matter, they are "electro-mechanical" and work off the current draw of the lights. If it doesn't work one way reverse the wires and try again.

This is assuming your using the original style bulbs as newer style bulbs may not pull enough current and the light will most likely come on and not flash. (this will also happen if one turn signal burns out, it needs both bulbs on to pull enough current to flash)

Polarity only matters on the newer electronic flashers used with LED lights as they will burn out if plugged in the wrong way.
 
X2...........................they may appear to use a 3rd green ground wire for a 3 prong flasher but you don't need anything there either. The green wire was for international flashers that wire differently. Let it hang attached to nothing.
 
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