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Voltmeter surges

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Old Aug 20, 2006 | 09:46 AM
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Voltmeter surges

Here is a new one. I have an aftermarket voltmeter in my truck, and this is the only reason I have noticed it. The truck runs fine no issues but the volmeter is moving. I plugged in my predator, no trouble codes, but in the data streaming it also shows a volt fluctuation. I plugged in a digital voltmeter into the cigarette lighter and same thing.

This has only been going on the last week or so. I have 3 month old batteries in the truck, good quality interstates. Any guesses?
 
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Old Aug 20, 2006 | 09:54 AM
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I'm thinking Voltage regulator.
 
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Old Aug 20, 2006 | 09:55 AM
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Early sign of the voltage regulator going out.. seen it often on our rescue trucks
 
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Old Aug 20, 2006 | 10:27 AM
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That is what I was thinking too. Guess it is time for a new alt. as well
 
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Old Aug 20, 2006 | 10:52 AM
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Fire Rooster - that's exactly what happened when my alternator started to go - that was the only clue I has was my autometer "volt" gauge. I just slapped a new one on and it's been fine since - but... what is this "voltage regulator"... a part of the alternator?? Or is it something seperate that could be bad?
 
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Old Aug 20, 2006 | 10:57 AM
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Originally Posted by CAT_man_963
Fire Rooster - that's exactly what happened when my alternator started to go - that was the only clue I has was my autometer "volt" gauge. I just slapped a new one on and it's been fine since - but... what is this "voltage regulator"... a part of the alternator?? Or is it something seperate that could be bad?
It's part of the alternator.
Nut
 
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Old Aug 20, 2006 | 11:08 AM
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Most modern alternators the voltage regulator was internal.
 
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Old Aug 20, 2006 | 09:27 PM
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Our voltage regulators are attached to the back of the alternator. They are removable and could be field replaceable, but I do not believe the parts are available seperately from the alternator.
 
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Old Aug 20, 2006 | 09:35 PM
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Originally Posted by cookie88
They are removable and could be field replaceable, but I do not believe the parts are available seperately from the alternator.
That
bites!
Nut
 
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Old Aug 21, 2006 | 10:46 AM
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How much is it moving? If it's just tenths of a volt you're fine. You should see a nice spike when the glow plugs stop glowing as well.
 
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Old Aug 21, 2006 | 01:05 PM
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13.3-15.6, changed the alt today seems to be fine now
 
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Old Aug 21, 2006 | 05:55 PM
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How many miles when the alternator puked? At 180,000 I am on my second one. Sure am glad they are a 10 minute r and r.
 

Last edited by Markadeck; Aug 21, 2006 at 05:58 PM.
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Old Aug 21, 2006 | 07:50 PM
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Originally Posted by Markadeck
How many miles when the alternator puked? At 180,000 I am on my second one. Sure am glad they are a 10 minute r and r.
FWIW mine died at about that mileage.
 
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Old Aug 21, 2006 | 09:46 PM
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68,000 miles
 
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Old Aug 23, 2006 | 09:07 AM
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Depending on where you are at, some places will rebuilt your existing alternater for pretty decent price.
 
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