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Unread 01-24-2013, 12:18 PM   #1
jademarzo
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1999 TJ Wrangler 
 
Join Date: Oct 2011
Location: Escondido, CA
Posts: 23
1999 TJ - Pulsing Interior & Exterior Lights

Hello Fellow Jeepsters,

I have searched the forums for an answer to an issue I've been having in my Jeep for the last 2 weeks or so. I've found some good information, but most problems others have been facing are not exactly the same as mine.

Jeep: 1999 Jeep Wrangler - Sport, I6, manual trans

When I sit at idle, the lights flicker, and the voltage meter goes from a 14 down to a 12, then goes red. Sometimes it jumps back on its own, sometimes not. As soon as I put it in first and start driving, the voltage meter runs back up to 14 and the light in the exterior and interior get brighter.

While I'm driving on the freeway, the light will also flicker even though I'm not changing speeds or gears. Sometimes they will get brighter as I push the gas, and get dimmer as I ease off the gas.

Does anyone have any ideas what this problem can be?

I know that it could be: Alternator / Voltage Regulator / Bad Ground...
But not really sure which of those it is most likely. Anyone have this problem before? Any clues on things to check to get a better diagnosis?

I really appreciate the time and everyone's responses.

Have a great day.

John

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Unread 01-24-2013, 03:34 PM   #2
WahooCreek
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2003 TJ Wrangler 
 
Join Date: Feb 2009
Location: Georgia
Posts: 450
Could also be battery issue.
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Unread 01-24-2013, 08:18 PM   #3
MarkR_98Sport
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2014 JK Wrangler 
 
Join Date: Nov 2012
Location: , Iowa
Posts: 57
Do you have any aftermarket electronics? Have there been any mods to the electrical system other than plug and play component? How old is the battery? Alternator? How long has the issue been going on?
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Unread 01-25-2013, 06:08 PM   #4
bigrob713
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1997 TJ Wrangler 
 
Join Date: Mar 2008
Location: Rome, GA
Posts: 7
Start with the obvious first. Check your belt and belt tension.
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Unread 02-06-2013, 04:13 PM   #5
jademarzo
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1999 TJ Wrangler 
 
Join Date: Oct 2011
Location: Escondido, CA
Posts: 23
Quote:
Do you have any aftermarket electronics? Have there been any mods to the electrical system other than plug and play component? How old is the battery? Alternator? How long has the issue been going on?
Only the radio. Battery is 1 year old, not sure about alternator though.


Quote:
Start with the obvious first. Check your belt and belt tension.
I will check out the forums and see if there is any info on it. Thank you for the response. I'll update when I figure more out.
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Unread 09-18-2014, 03:12 PM   #6
JWebber
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1999 TJ Wrangler 
 
Join Date: Aug 2011
Location: Lewisville, Texas
Posts: 1,005
Bad ground somewhere, check all ground wires and check the end connections. clean all your battery connections as well.
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lights , pulsing , tj , wrangler

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