Try jumping across the 2 large terminals om the back relay you just replaced, while someone else turns the keyswitch on the dash to the crank position. Perhaps that rear relay is not getting a good ground connection. My front relay had 4 total wires just like the old Ford fender mounted relay, 2 large terminals for the current to pass through, and 2 top mounted terminals, 1 was ground, the other was the trigger current from the crank position on the dash start switch.
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