I am installing a 1974 302 Mercruiser engine. It is in the boat and I have hooked up the harness, wires to the starter...coil..etc. I have 2 tan wires hooked up on the "IN" side of the coil and 1 black wire hooked up on the "out" side of the coil. I am getting a reading of 8 volts going in and 8 volts coming out and I think it should be 12V in and out. What am I doing wrong? OTHER PROBLEM..When I turn the key to the "on" position, the engine tries to "start", which is not right. But when I immediately turn it "OFF" and then try it again...It does nothing! My after market book does not tell me anything about a safety switch. Is the circuit breaker stopping it from turning over again? And what have I got wired wrong for it to be doing all of this? I thought that I had wired it according to the manual, but apparently not. BIG THANK-YOU for any HELP that anyone can give. Needless to say we have changed the wires around, but apparently have not gotten the correct combination.