Voltage meter going haywire

Tiny
MARIO BUCIO
  • MEMBER
  • 1995 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
A while ago I had the alternator on my Laredo refurbished.
Now the lights go high randomly, and the voltage meter goes up to 19 when it happens also when it goes to 0 the lights turn off, the radio shuts down and sometimes my jeep dies. Any help is greatly appreciated.
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Tuesday, November 1st, 2016 AT 10:00 AM

5 Replies

Tiny
CJ MEDEVAC
  • EXPERT
Sounds like the alternator is the issue, verify this by having an auto parts store test it. Most likely it can be checked while on the vehicle.

This might also help you out prior to buying a new or reman alternator. See my link.

http://www.2carpros.com/questions/2001-dodge-neon-milage-just-want-put-fliuds-their-locations

Let us know how it goes!

The Medic
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Tuesday, November 1st, 2016 AT 2:13 PM
Tiny
MARIO BUCIO
  • MEMBER
I did a quick check on the alternator by removing the negative cable from the battery while the vehicle was on to see if it shot off, but it stayed on. Also, when the battery dies I jump start it and it works okay. I will be taking it to get it check at the auto parts store.
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Tuesday, November 1st, 2016 AT 2:25 PM
Tiny
CJ MEDEVAC
  • EXPERT
I reckon this being a 1995 it has a computer, a sensitive piece of equipment

Removing the battery cable while it runs is the very worst thing you could have done!

Way back, you could do that. When you tried that on a 1960's- through 1970's and early 1980's vehicle you "might" muff up the voltage regulator, but what the heck, a whole alternator for an average vehicle might cost $35.00 back then. A whole bunch cheaper than a computer!

Maybe you have not done damage or compounded your issue.

Up there at the top of our pages is "repair guides"

I went ahead and grabbed the one you need.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

The alternator may still keep it running (doing it the wrong way) but it may be over charging and giving Mr. Computer too much voltage. Over charging may also damage the battery or even make it explode!

Keep us posted

The Medic

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Tuesday, November 1st, 2016 AT 5:42 PM
Tiny
MARIO BUCIO
  • MEMBER
I went to get the charging system checked. The alternator and voltage regulator are good, they said. The battery, however, was bad. I got a new battery, no problems so far. I will know more tomorrow when I drive to work and see what happens. I still get code 12 and 41 in my diagnostic codes.
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Tuesday, November 1st, 2016 AT 6:37 PM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Best, Ken
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Monday, November 7th, 2016 AT 8:33 AM

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