I hope someone can help me.
I a have 65 El Camino witha 327
I had installed a new MSD ready to run distributor and a new coil about a year ago.
But I never hooked it up to a 12 volt power source
I just used the 9 volt power source....didnt know any better.
How do I hook it up to a 12 volt source and what kind of diff in performance will it make?

Your new ignition system needs the full battery voltage to realize its full potential. Otherwise, it will most likely breakdown (misfire) under any kind of excessive loads. Sounds like you're not running a ballast resister, but GM's favorite - the resister wire. Trace the ignition wire to the ignition switch. Discard the wire and replace it with a heavy gage wire. Or wire the existing wire into a remote relay to supply unrestricted battery voltage to the ignition system.

I folllowed the resistor wire (white cloth coverd wire) it went into a small black box behind and under the power brake booster ...lost it after that...now what do I do?...not good at all with electrical.
a diagram would help...

Error , sorry see next post!

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[color=yellow][size=2]Doc Here

I found a better Schematic, for your car..Just backtrack that wire to where the cloth wire attaches to a BLK / Purple wire, Cut it there, add the length of proper gauge wire from the blk/purple wire needed to reach the HEI BATT term, and there should have been a Black / Purple Wire already on the coil, Extend that wire there too.. join them together with the BATT terminal on the HEI and you should have it, Both Primary and secondary Ignition. (See Photo)

P.S. If that wire is cotton clad all the way to the firewall plug, just abandon it (Be sure to insulate it) and run a wire from the BATT terminal on the Voltage regulator, join it together with the other purple/ Black (or black /purple) and run those to the BATT terminal on the HEI for an equivalent Circuit.

Hope I didn't confuse you!

just Doc [/color][/size]

Attached Thumbnails

 

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Thanks guys...Great schematic.
However I do not have a regulator its built into the alternator....and the cloth wire goes all the way to the fire wall. Now what do I do..I dont want to cut the wrong wire......

http://www.oldengine.org/unfaq/hei.htm

i did this on my chevelle and it has yet to start on fire

[color=yellow][size=2]Doc Here

68Vell's procedure is a good one. I'd follow that.

If you have trouble or for some reason can't follow that, get a 12 Ga. wire, and crimp on a proper slide clip to fit on the fuse box, carefully cut a 1/4 inch hole in the firewall, pass the wire through it and a grommet and hook the end with the slide terminal to any open male slide terminal on the fuse box that say's "IGN" Hook that together with the other black / Purple wire, into an in-line fuse, and into the BATT terminal on the HEI.

But Try 68Vell's Procedure first, It's by far the best.

Doc [/color][/size]

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