What exactly does the crank fuse do? I keep blowing it, but car runs fine?!

Wish I could help you. I've had my 87 GT for 13 years and the factory manual for almost as long but I've never heard of a crank fuse. Is that something like a roll of flight line?

Seriously, what year/model do you have? Maybe someone here can narrow it down for you.

If you blow that fuse or remove it, the car shouldn't start. That fuse is what activates the windings in the starter I believe.

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1986 Pontiac Fiero 2.8
pocket ported, gasket matched complete intake. Still has no nut.
3.4l turbocharged project in process!

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No Such Thing ----------------

Yep I remember the crank fuse. TBI only I think.......anyway....whatever, the car shouldn't run without it.

Phil

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GTDude
OVER 25 years GM experience

And while your at it you should always adjust or replace the inner and outer muffler bearings.

I had a 2.5 crank fuse once.......the crank fused to the #3 rod bearing

84-86 4 bangers have a crank fuse, not sure on the others. It's a 3 amp fuse located below the circuit breakers in the fuse box.

It is a constant power feed to the ECM. What it does I'm not sure, my guess is that it is the power feed for ECM memory.

If it keeps blowing, you probably have either a faulty ECM, or a short in the wire between the fuse box and the ECM.

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1988GT T-Tops, 5spd, Loaded

OOOOOOOOOH Always wondered that one, because there is no way that a 3 amp fuse could take the load of the starter solenoid. The wire alone is one of the thickest on the car.

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hmmm... to ecm u say? hmmm... could be. Car switched motors from 84 to 86 6. still there is power going through it... but when i hooked up a ground with a light and checked each side, there was power out both... know why?