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Battery light remains on with key off. 93 K2500HD

GM Guy

Manual Trans. 2WD Enthusiast
Messages
4,838
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Location
NW Kansas and SC Idaho
Hey all,

got the low mile injection pump in my 93 K2500HD, and it runs great (and primes up after I remember to put the pump wiring back on after cranking for a while... :nonod::skep::hello:

anyways, fired it up and let the air clear out for a minute of so.

the first attempt to crank was met with the battery I cooked by cranking too long last summer letting me know its is shot when it was asked to do all the cranking with the drivers side battery unhooked.

put a new battery on, hook up the ground on the DS batt, and go to cranking.

rolled over great, and finally fired up. I have the serp. belt unhooked and the alt flopped to the side, since its one bracket is removed for intake removal. battery light on, no tach of course.

now, here is where it gets weird. I shut it off after 1 minute or so(due to no WP turning) and the battery light STAYS ON.

I unhooked the batteries and called it a night.

what could it be? backfeeding off the alt, and the problem will solve itself when the alt is hooked back up,

or did I roach something hitting the key with a crappy battery? I hit the key, it rolled over once, and I went key off, tightened terminal, hit it again, rolled over again, still no good, so I quit and put the new one it.

any input appreciated, thanks!
 
Don't run it till you know the alternator is good. You don't full field high voltage coming out of a bad alternator.

Unplug the alternator plug. If the light goes out the regulator likely shorted out. Use a voltmeter and probe the alternator plug terminals to be sure it is bad as it will have 12v on the terminals of the alt. (Coming from the positive battery terminal to the turn on plug.)

Otherwise your ign switch went bad or you have a short to positive somewhere.
 
Unplug the OPS and see if it goes out. I've seen bad OPS cause the lights to stay on as they can short out internally and backfeed.
 
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