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Unread 07-31-2008, 02:06 PM   #1
BlackBellamy
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1999 TJ Wrangler 
 
Join Date: Oct 2007
Location: The Empire State
Posts: 2,208
Voltage gauge drops to zero intermittently

I have recently started having this intermittent problem. I'll be tooling along, everything great, and I notice my 'check guages' comes on because the charging system voltage gauge shows zero.

I shut off the Jeep and turn it on again and one of two things happens:

1) The voltage gauge shows a good charging system voltage. No more problems (at least for a while), I'm good to go.

or

2) The voltage gauge will show a low charging system voltage - somewhere around 12-13 volts. The gauge will then fall to zero after a minute or two, especially if I accellerate past 40 mph. If I repeat the turn off/turn on process eventually it 'fixes' itself.

This started happening to me about two months ago, once here and once there, then it didn't happen for weeks, and now I've had this problem like three days in a row.

I've checked all the connections at the battery and the generator, and everything is nice and tight. The generator belt is good too.

I'm not too electrically inclined. Is there something I should check specifically? I have a multimeter so if anyone has a suggestion on what I should check and where I would appreciate it.

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The top and doors on this vehicle are designed only for protection against the elements. Do not rely on the top and doors to contain occupants within the vehicle or to protect against injury during an accident. Wear seatbelts at all times.
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Unread 07-31-2008, 03:10 PM   #2
mylt1
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Join Date: Oct 2005
Location: Virginia
Posts: 5,881
check the connection to the gauges themselves. could be loose there.
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Unread 08-01-2008, 12:01 PM   #3
BlackBellamy
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1999 TJ Wrangler 
 
Join Date: Oct 2007
Location: The Empire State
Posts: 2,208
yeah will do - a mechanic friend yesterday told me it sounds like the gauge so if it's not a loose connection i'll see if another gauge (i got a spare, not oem but it will do) exhibits the same problem
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The top and doors on this vehicle are designed only for protection against the elements. Do not rely on the top and doors to contain occupants within the vehicle or to protect against injury during an accident. Wear seatbelts at all times.
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Unread 08-17-2008, 09:15 AM   #4
BlackBellamy
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1999 TJ Wrangler 
 
Join Date: Oct 2007
Location: The Empire State
Posts: 2,208
Nope, it was the alternator. Buck-twenty five out of pocket and replaced the alternator yesterday after it died and stayed dead.

What happened was I went wheeling in the mud and didn't clean out the alternator sufficiently. It would work ok, except when under heavy load/rpms/hot it would start to crap out a little, giving 12-13v instead of 14+. Eventually it would crap out totally - except when I shut of the engine and started again it would go back to work and behave normally because it would cool off a bit.

After I took off the old one I gave it a couple of whacks with a hammer and this big cloud of dust came out
__________________
The top and doors on this vehicle are designed only for protection against the elements. Do not rely on the top and doors to contain occupants within the vehicle or to protect against injury during an accident. Wear seatbelts at all times.
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