I have a '76 40 hp Mercury mod. 402 2 cyl. whose wiring harness has fallen apart. I have most wires connected, however the old harness has a wire coming from the plug going to the terminal block. The new harness instructions say nothing of a wire going to the term. block. The only wire long enough to reach the block is 18awg red but the instructions say that it goes to POS of rectifier and (may not be needed). Can you help?

