4-pin ignition module
I need to know what is the polarity for the 4-pin module end that connects to the two wires in the distributor, so that I can connect the MSD harness for the 6AL.
Are the green wire (-) negative and the white wire (+) positive?
The L81 has a 7-pin, and I could not find info from Accel Ignitions.
I've done a coupla 4-pin HEI-MSD 6 jobs ... without buying additional harness from MSD. On a 4-pin HEI ... the WHITE wire from PICKUP is POSITIVE magnetic and it connects to MSD's small VIOLET (+) "MAGNETIC Trigger" ... & the GREEN wire from PICKUP is NEGATIVE and it connects to MSD's small GREEN (-) "MAGNETIC Trigger" wire. On a 4-pin HEI you remove or bypass the module entirely ... and wire pickup directly to MSD.
Originally Posted by GerryLP
I've never done 7-pin HEI-MSD 6 job ... but I can see from the diagram that it is wired QUITE different from 4-pin HEI-MSD 6 job.
If you'll go to www.msdignition.com you can download a free pdf ( MSD 6 Series Installation Instructions http://www.msdignition.com/pdf/6series.pdf ) that shows wiring diagram for 7-pin HEI (& many others too). I can see from the diagram that (when used with 7-pin) the MSD does not use its magnetic pickup wires (as with 4-pin) ... instead, 7-pin setup uses MSD's small RED (+) and small WHITE (-) "POINTS/AMPLIFIER TRIGGER" wires ... AND the 7-pin module STAYS PUT, is utilized and is connected. Looks like this can easily be done without buying additional harness from MSD. Download the pdf and you'll see just what to do ... on about page 17 of about 24 page pdf. Get it right the first time or you'll quickly smoke the MSD box ... and maybe the pickup / module too.
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