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Old 02-05-2006, 02:56 PM
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MSD coil testing

Well, I went out to crank my trucl today and discovered that I have no spark.

So I did a little testing...

Tested battery voltage at battery: 12.6 volts.

Tested power lead to HEI: 12 volts

Pulled off dist. cap and thoroughly cleaned it (lightly sanded contacts throughout). Reinstalled it.
Still no spark

Pulled coil out of cap and did some more testing...

With a DVOM, I tested for resistance between the red and black leads for the coil . Got a reading of OL.

Tested between the yellow lead and black lead. Reading of OL

tested between the yellow and red leads. Low resistance (less than 1 ohm).

I have tried to find an exact testing sequence for the MAD coil and have yet to find one.

I fear the coil has died.

Shouldn't there be a reading between the red and black other than OL?
What about the yellow and black?
shouldn't the reading between the yellow and red leads be OL instead of less than 1 ohm?

also, if anyone happens to know NAPA's part # for the MSD in cap coil for a GM hei it would be greatly appreciated. There is a NAPA warehouse 5 minutes away and I bet they probably have it, though te guy answering the phones seems to have no clue.
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