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Re: 68 C10 Yellow wire from firewall to starter/coil.
You have to check the voltage while it is actually hooked up to the coil or HEI distributor, and check the voltage at the coil or distributor, because if a resistor wire has no load it will read 12V. When you put a load on it, it drops in voltage. Or just follow the wire and verify where it goes. For HEI you don't need it to go to the starter. That starter connection and yellow wire from starter to coil was only to provide a full 12V during start, to give the coil extra high spark voltage to make sure the engine would start. Once started, the coil just received a reduced voltage from the resistor wire or ballast resistor, and that makes the points last longer.
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