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  #1  
Old September 9th, 2014, 10:57 AM
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High voltage

Ok, looks like I have a second project in as many days....symptom is when I am driving at high rpms, the battery gauge reads high. If I drive around base at slow speeds and lower rpms, it reads normal. The PO said the battery was dead before I bought it because he hadn't driven it in 5 months. He had it charged by a mechanic and they said it was fine. The two pictures show the gauge after high rpm driving and what it looks like after turning the truck off and back on. No major issues though other than the gauge reads high. Thoughts??? Alternator or bad battery?
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  #2  
Old September 9th, 2014, 11:00 AM
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high voltage is your alternator regulator. no buts about it. only way to confirm it's not the gauge is with a multimeter with your engine running.

not sure what engine you have, but my alternator has a replaceable regulator. cost $20
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  #3  
Old September 9th, 2014, 11:04 AM
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Quote:
Originally Posted by Overlander View Post
high voltage is your alternator regulator. no buts about it. only way to confirm it's not the gauge is with a multimeter with your engine running. not sure what engine you have, but my alternator has a replaceable regulator. cost $20
Ok cool that's what I was think it might be. It's a 200 TDI

------ Follow up post added September 9th, 2014 09:04 AM ------

Quote:
Originally Posted by Overlander View Post
high voltage is your alternator regulator. no buts about it. only way to confirm it's not the gauge is with a multimeter with your engine running. not sure what engine you have, but my alternator has a replaceable regulator. cost $20
Is it something that I need to be extremely worried about or can I slow roll it a few days?
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  #4  
Old September 9th, 2014, 11:06 AM
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See if you can grab a pic of the alternator. The normal 65A model has a regulator that is easily replaceable. the 45 A model does not.

As stated, first measure voltage with a real gauge.
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  #5  
Old September 9th, 2014, 11:19 AM
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Please be careful with this "over charging" situation...your battery will start to boil and or explode depending on type...I speak from personal experience on this.
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  #6  
Old September 9th, 2014, 11:38 AM
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Quote:
Originally Posted by Bill Larson View Post
Please be careful with this "over charging" situation...your battery will start to boil and or explode depending on type...I speak from personal experience on this.
This.
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  #7  
Old September 9th, 2014, 11:39 AM
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Honestly that gauge is pretty useless. You really have no idea what the charge voltage is just by looking at it.
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  #8  
Old September 9th, 2014, 11:50 AM
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Quote:
Originally Posted by o2batsea View Post
Honestly that gauge is pretty useless. You really have no idea what the charge voltage is just by looking at it.
True...just another tool in the tool box, very simple gauge. But it's an indicator...
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  #9  
Old September 9th, 2014, 11:56 AM
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As Bill hints, you need a voltmeter to see exactly what is happening, you just can't tell by looking at the stock gauge.
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  #10  
Old September 9th, 2014, 12:36 PM
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Quote:
Originally Posted by rdavisinva View Post
As Bill hints, you need a voltmeter to see exactly what is happening, you just can't tell by looking at the stock gauge.
Ok, sounds good, our household goods haven't arrived yet so I'll bum one off a friend or stop by Mansfield 4 x 4 and have them take a look
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  #11  
Old September 9th, 2014, 12:49 PM
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Quote:
Originally Posted by Red90 View Post
See if you can grab a pic of the alternator. The normal 65A model has a regulator that is easily replaceable. the 45 A model does not. As stated, first measure voltage with a real gauge.
Here are the best pics I could get with my wonderful iPhone
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  #12  
Old September 9th, 2014, 12:56 PM
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I think it is a 65A.



See the bolt on black/silver thing on the back of this picture. That is the regulator/brush assembly. If you have one of those, they cost around $20 and you can change it in 10 minutes.
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  #13  
Old September 9th, 2014, 01:00 PM
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Quote:
Originally Posted by Red90 View Post
I think it is a 65A. See the bolt on black/silver thing on the back of this picture. That is the regulator/brush assembly. If you have one of those, they cost around $20 and you can change it in 10 minutes.
Awesome, thanks so much!
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  #14  
Old March 5th, 2015, 08:17 AM
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Figured I would recycle this topic since I was looking for reasons why my volt gauge is pegged off the charts to the right. 1984 90 with it's original 2.3petrol (slightly glorified 2.25) I of course wanted to be sure there was not an overcharging issue back to the battery first. Brand new battery yesterday and reads perfect when not running, and when running I never exceeded 13.99 volts which proves I am not over charging. This is the first time I have started it since buying it over a year ago.

So I don't think it's my voltage regulator that's bad? Am I correct in thinking if it was a grounding issue it would read all the way left on the gauge, as in no reading? Testing with volt meter on the gauge posts reads around 12.6 when key switched on but not running which makes me think it's the gauge itself that is bad. Any thoughts?
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  #15  
Old March 5th, 2015, 09:06 AM
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Quote:
I was looking for reasons why my volt gauge is pegged off the charts to the right.
Bad ground on gauge.
13.9 is a tad low. 14.4 is the ideal number.
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  #16  
Old March 5th, 2015, 09:18 AM
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Quote:
Originally Posted by o2batsea View Post
Bad ground on gauge.
That was my initial thought but I have run a jumper from the ground post at the back of the gauge direct to the neg. on the battery, still pegged to the right.
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  #17  
Old March 5th, 2015, 09:28 AM
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Bad INTERNAL ground on gauge
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  #18  
Old March 5th, 2015, 09:37 AM
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Quote:
Originally Posted by o2batsea View Post
Bad INTERNAL ground on gauge
Gotcha, so basicly replace. I have no time, patience or attention span for electrical issues or as you have put it electrickery! Thanks, will order a new one.
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