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2001 Alternator


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Driving home tonight the volt gauge pegs at 18V. Assuming my alternator effd up I was pulling over to give ...


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Old 09-09-2016, 11:17 PM   #1 (permalink)
 
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Default 2001 Alternator
Driving home tonight the volt gauge pegs at 18V. Assuming my alternator effd up I was pulling over to give it a good smack. Got stopped and it smartened up.
So Im thinking the brushes are bad and thought I had two spare alternators at home. Nope. A 94 and a 99 are different than my 01. Like to make them work if I can.

Anybody know how to rewire my truck.
Where would I find a rebuild kit for my alternator.
(my question marks dont work) (neither do my apostrophes)


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Old 09-10-2016, 05:22 PM   #2 (permalink)
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First, try to recreate the problem while a multimeter is attached. Also, check your battery for loose or corroded connections, that can cause high charging voltages as well.

18.6V is very high, i'm surprised nothing was damaged and bulbs aren't burnt out after that, especially given the time it must have been acting up for you to have started to pull over.

Did the lights change intensity? PCM trouble codes (i'm pretty sure too high a charging voltage will throw a code)? What were you reading the voltage off of, factory gauge, aftermarket?
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Old 09-10-2016, 08:44 PM   #3 (permalink)
 
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Didnt act up all day today. Drove maybe 4 hours. Battery is good, etc. Luckily the CHECK GAUGES light came on with a soft bing bing bing of the alarm bell.
Was daytime so I saw no light increase, no codes, factory gauge.
Reman here is $185-$225 plus tax. Used at wrecker is $35 wholesale, $50 retail with 90 day warranty.
Cheap enough to buy a used one


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Trudeau & the NDP.
daylight savings. Leave the clocks alone.
NO TO BILL 6.
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Old 10-12-2016, 03:11 PM   #4 (permalink)
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It's a ground.
Had that exact issue.
Cleaned the terminals, cleaned the ground and ran extra ground wires.
One to the alt case itself.
I rebuilt my stock alt and turned the comutator prior to that.
I got the rebuild kit online and I think I searched Denso to find it.
The Commutator was wayout out of wack.
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Old 10-12-2016, 10:01 PM   #5 (permalink)
 
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Originally Posted by meistermash View Post
It's a ground.
Had that exact issue.
Cleaned the terminals, cleaned the ground and ran extra ground wires.
One to the alt case itself.
I rebuilt my stock alt and turned the comutator prior to that.
I got the rebuild kit online and I think I searched Denso to find it.
The Commutator was wayout out of wack.
Thanks. I know my ground to the battery is loose. Loose enough to wiggle off anyway. Has been for a year or better. Helps when working on the truck, makes a lazy way of taking it off.

Have yet to have the issue repeat itself. Still same alternator.


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Trudeau & the NDP.
daylight savings. Leave the clocks alone.
NO TO BILL 6.
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Old 10-13-2016, 12:38 AM   #6 (permalink)
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Yep.
Would only do it every now and then to me.
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Old 10-13-2016, 08:08 AM   #7 (permalink)
 
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It's one of those things that's going to resurface in a blizzard. Lol.


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Trudeau & the NDP.
daylight savings. Leave the clocks alone.
NO TO BILL 6.
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Old 11-06-2016, 09:56 PM   #8 (permalink)
 
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Did it again today. Several times. All I did was shut the engine off and turn the key back on. Engine would fire up and charge fine for another mile. I wasn't even stopping, just going 70mph, shut it off in gear and turn it back on. Tomorrow I'm buying an alt.


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Trudeau & the NDP.
daylight savings. Leave the clocks alone.
NO TO BILL 6.
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Old 11-07-2016, 09:36 PM   #9 (permalink)
 
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Got a new to me one for $25 with 120 day warranty.


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I've done more stupid sh#t as an adult than I ever did as a kid.
Trudeau & the NDP.
daylight savings. Leave the clocks alone.
NO TO BILL 6.
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Old 11-07-2016, 10:10 PM   #10 (permalink)
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You did check for corrosion on the battery and alternator terminals right?

If not, there are a couple things that could cause high charging voltages. Make sure you check the voltage sense and excitement wire on the alternator (its a 2 pin connector) If that is loose or corroded, it will cause this problem.

If that is all good, the next cheapest is to replace the alternator. If that doesn't fix it, its possible that the VRM in the PCM is fried.
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