Quote Originally Posted by Ron View Post
What kind of alternator is it?
If it is a GM style and the light comes on when the key is on then goes off once running, a very common reason for low voltage is the pulley is to big. GM basically has 2 sizes, most of which are the larger one. They have a larger drive pulley than Ds...
(It should never get down to 12V, running.)
It’s from DMC-CA. The computer printed invoice says 105a, the handwritten one doesn’t specify. Same part number (110101) on their website currently describes it as 120a. Mine is from 2011 though, so it’s quite possible the actual item changed since then. The pulley is correct. I have fine voltage when driving, just at idle (especially when super hot) does it get low.

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Having low idle voltage should be a separate issue than the blower motor tripping a 40a c/b though, no?