Question about 1993 GMC Sierra C3500
Brand new batteries. Advance said alternator is fine. both batteries read about 11.5 on voltmeter. used voltmeter at alternator plug and got a reading of 1.65 topped out. Alt. bad or batteries bad?
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Posted on Jan 02, 2017
i have a 2003 chevy silverado the riverse has not worked for 10.000 miles any sugesstionswhat this might be and or how much.
Posted on Jul 15, 2009
sounds either like your alternator is bad, if it still goes dead then i would go with the alternator, other wise a cell or two could be bad or shorted in the battery.
Posted on Jun 25, 2010
Testimonial: "I'll try a battery first although it's only 2 years old."
SOURCE: Hi! I have a gmc
That is correct! Your alternator isnt putting out the necessary voltage/amperage to keep the battery light off.
Have the vehicles charging system checked at a local parts store. They can also do a free load test on the battery. Just to be sure.
Posted on Nov 01, 2010
I have been sitting here for about ten minutes rereading your problem and the one thing that I am not clear on is does the voltage actually drop or are you taking the gauges reading and assuming that it is accurate? Does the battery drain if you continue to drive the truck to a point that the battery goes flat? If you have a meter that will read volts DC take the truck out and run it till you get the problem happening.Pull over and read the voltage at the battery terminals.It should be between 13.2 and 14.4 volts DC .If it is the gauge has a feed problem,like a bad wire.This bad wire will heat up,after the truck is running for a few minutes,because of the resistance in the wire, and the voltage reading will drop at the gauge ,which in turn will trip the battery
light.I'm trying to think outside the box here with the information posted,hope my speculative ramblings might give you another direction to look at.Good luck and if you get a chance let me know how you make out.
Posted on Nov 17, 2010
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