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Old 09-27-2010, 03:57 PM
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coil help

I have a 1969 camaro. It has two wires coming from the firewall to the coil + side. When I hooked up msd to the two wires that come off the + side of the coil one wire started to smoke when I turn the key to one position. Do I need both wires since I now have a hei? we cut the one that was smoking and everything else seems to be working fine. Is that wire for the old point system? If I do need bothe wires where do I hook up the one wire??????

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Old 09-27-2010, 04:13 PM
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Of the two original "12v+" wires on the coil, one comes from the ignition switch, coming out through the main firewall plug. The other comes from the starter "S" post, small post farthest from the block, and was a full 12 volt bypass wire to provide strong power to the coil while the starter is cranking, for easier starts. With an HEI or MSD ignition, this wire from the starter is no longer needed.

If this is a standard one wire HEI style distributor, you will also need to replace the 12v+ wire from the main firewall plug/fusebox to the HEI with a 12ga or larger wire. Reason is because the original points coil 12v+ wire is a resister wire, to lower the voltage to around 9 volts to avoid burning up the coil and the points. The HEI needs a full 12v+ to work correctly, not lowered voltage. It will run with the resister wire, but be low on spark energy, plugs foul easily.
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