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1991 jeep Cherokee what does the 30amp engine control fuse cover under the hood and what would cause it to blow not allowing the vehicle to start or run?
Wiki User
∙ 16y ago
Context (for anyone reading this thread, who doesn't know where that fuse is) is the fuse block underhood, behind the battery. If you haven't checked for a short, that is the 1st thing to look for. Make sure ignition key is off, and disconnect the battery positive lead. Pull the fuse, then check resistance of both contacts (that fuse plugs into), against battery ground. If both have no (or little) resistance, you have a short.
If there does NOT appear to be a short, and you have a stout analog (needle gauge) multimeter, you can pull the fuse, and measure at those contacts, to see how much current is being drawn.
My situation is a little different. The fuse isn't blowing, but with the ignition key off that circuit is drawing more than 50 milliAmps. Overnight, or sometimes over several days, it drains the battery. I'm still looking for the culprit...
After a few days when the battery did not drain overnight, today battery was down to 3V. After a good long 2A trickle-charge, and contrary to what the analog multiMeter showed, a digital multiMeter shows only 0.7 mA being drawn by Engine Control, and 2.1 mA Fuse Block (for the interior, likely clock), with ignition key off.
Wiki User
∙ 16y ago
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