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Old 11-18-2018, 10:24 PM   #15
swissarmychainsaw
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Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
Re: Alternator won't charge and reference wires are grounded

Quote:
Originally Posted by snowball View Post
Hi all,

My 90 burb R1500 350 won't charge. battery always shows 12 V. I brought my alternator to be tested and it passed. I checked the reference wires by putting a multi meter and testing continuity and they're grounded.

Just wondering if there is a common place to look for the short or any advice.

Thanks!
Assuming you don't have this fixed yet, can you describe what "won't charge" means here? I'm assuming your battery is flat and wont start the truck?
How old is the battery? Did you fully charge it before doing any of these tests?
It should be charged at 12.4-8 volts.

I find that they key to diagnosing problems is: 1. be clear on what you assume 2. do the easy stuff first

So you're assuming the battery is ok. Have you had that tested?

My 1991 burb "wouldn't start" but instead of saying that, I said "it has a bad battery". Which I replaced (probably not a bad idea), only to find out the problem persisted! It was a bad starter.

Make sure you cover the basics, then we can go back to wiggling wires!
:-)
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