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Old 04-19-2013, 10:05 PM
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4 pin HEI msd hook up

Bought the specified harness to hook up my 6520 msd box to my GM hei.

I removed the module from the dizzy and found the wire colors are different. MSD harness has violet and green. The hei has green and yellow. I assume it is green to green and violet to yellow????????? The wiring diagram from msd does not explain the colors here that well.


Any help would be apprieciated

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Old 05-14-2013, 02:48 PM
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Download the instructions from MSD. I have done this twice with my Nova. When I installed the first vacuum advance HEI, then when I replaced that one. Both times I couldn't find my manual.
"These wires are routed together in one harness as the magnetic pickup
connector. The connector plugs directly into an MSD distributor or
crank trigger. It will also connect to aftermarket pickups. The Violet
wire is positive (+) and the Green wire is negative (-). When these
wires are used, the White wire is not."

Before you remove the ign. module, check with a volt meter. I'm thinking that "W" being the bigger one is the "+" and "G" the smaller one is "-".

IICR, it is green to green. The MSD uses the same connector as RC cars used to. So I had some extra. I used black wires for both, and mounted the MSD to the firewall above the heater core housing. Tried to clean up the wiring harness with electrical tape, so unfortunately, I can't trace it for you.

I would rather not use an ignition module. Better to just use the pickup from the dist. Never be stuck out on the side of the road on a hot day!!

Oh, and you can hook up an ignition kill switch by grounding the white wire. That can also be used with a relay in your alarm, (if you have one) so even if they get past the starter kill, they can't get it running!
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