Wiring an MSD 6AL

pwrjunkie80 · Feb 2, 2009

Hey all. This may have been covered before, but I have a question about the wiring of the 6al box. Situation is, I just installed a new engine wiring harness for my 69 chevelle. Realizing I got the non HEI, I made the necessary switch of the resistance wire to 14 gage wire. I now have the 6al in place and the wiring harness in place. I now just need to make the necessary connections. My questions are, what wire from the harness connects with the 6AL and where. And are the wires (purple and yellow) from the harness that go to the starter even needed anymore? The 6al manual states that it needs a 12v switch that is plugged to the thin red wire. Im assuming this would be the ignition switch wire? Which is the wire that originally would have plugged to the distributor? This is where im confused.

Thank you all in advance.

Tim

Cameano · Feb 2, 2009

http://www.msdignition.com/instructions/Products/Ignitions/6420.pdf?terms=6420

Elree Colby · Feb 2, 2009

There was no need to change the resistor wire. The 6AL IGN input is a switching input, no current flow so no voltage drop. Either way IGN the wire connects to the 6AL RED wire.

pwrjunkie80 · Feb 2, 2009

Ok, I have one more question. I know that the purple wire goes to the starter, but does it go on the same post as the battery + wire? Also I have the yellow wire that is connected to the original coil positive wire that looks to go down there too. What terminal does that go on? I have looked at the color coded diagram on one of these posts. The starter on there looks like it has 3 posts. Mine is a Summit high torque mini starter and has 2 posts. The upper post is for the battery and the other one I suppose is for the bendix?

Tim

Elree Colby · Feb 3, 2009

The ppl wire connects to the smaller of the two posts on the starter. The yellow wire is not needed with the MSD, either clip it off or secure it back out of the way.

pwrjunkie80 · Feb 3, 2009

Ok, yea the manual says to hook it to the spade terminal. The posts on the solenoid are the same size, but it has what I believe to be a spade terminal off to the side that is attached to the lower terminal. I guess just in case I had a different connector. Thanks for the info.

Tim

Dean · Feb 3, 2009

Did you look at the MSD instruction sheets posted?
(Just curious because you said that you replaced the resister wire.)

Elree Colby · Feb 3, 2009

That's it Dean.

pwrjunkie80 · Feb 4, 2009

Yea but I didnt put 2 n 2 together til it was too late. Guess it wont hurt anything. I just plugged up the starter and installed. Tried to check the gear lash but when I pull the pinion to line them up they are positioned wrong and hitting each other. No oil in the motor so I can turm the flywheel. Guess I should just wait?

Tim

1Fast7D · Feb 4, 2009

Elree Colby said:
There was no need to change the resistor wire. The 6AL IGN input is a switching input, no current flow so no voltage drop. Either way IGN the wire connects to the 6AL RED wire.

Just a clarification, IGN wire connects the the 6al small red.

pwrjunkie80 · Feb 4, 2009

Yep, the resistance wire. The old coil positive wire.

Tim

Half66Chevelle · Sep 4, 2010

Hoping some of you guys can drop some knowledge on my post (similiar questions):

http://www.chevelles.com/forums/showthread.php?t=329972

Wiring an MSD 6AL

pwrjunkie80

Cameano

Elree Colby

pwrjunkie80

Elree Colby

pwrjunkie80

Dean

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