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Print in friendly format Send this term to a friend  Rat Motor
GM production big block engines were known as Rat motors.

'W' Series:

5.7L 348ci - 1958 thru 1964
6.7L 409ci - 1961 thru 1965
7.0L 427ci (Z11...
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Re: Help on CCM pull...

Subject: Re: Help on CCM pull...
by Matatk on 2016/1/4 17:26:33

I think you should have battery voltage regardless of whether or not the ignition is on. According to the wiring diagram, it has "hot at all times" to the a/c programmer fuse and then it goes directly to the C4 pin. You might have corrosion in the fuse box or a bad connection at the fuse itself. Try taking it out and replacing it and see if that helps. Otherwise, I'd be checking the resistance of that wire.
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