battery gauge goes up and down?

**1990celicagts** · 10-29-2008, 11:15 PM

My battery gauge goes up when I am driving (higher RPM) and goes down when idling (LOW RPM). Is this normal?

I have tightened the alternator belt as much as I can.

**gerby77** · 10-30-2008, 01:30 PM

Well, to be true, i have seen this only when i.e. i'm in front of a trafficlight and i want to go left or right and my directionlight go on and off.

It can ofcourse be, because during higher RPM the motor of your car makes the alternator belt run quicker, which means, more power produced.

What do the other guys think about my explanation? ;-)

**RaidenDB** · 10-30-2008, 04:00 PM

I think your battery is about to go. Try a different battery if you can.

**jlspec** · 10-30-2008, 07:32 PM

Battery and alternator are going. Replace both.

**awhite83** · 01-27-2009, 02:06 PM

I know what it is it happened to me. it's called a voltage regulator it's inside the alternator but you can't just replace that you have to replace the whole thing and if you do that and it is still doing then there is a bigger electrical problem and you will have to go through the entire system. i had to do that i ended up replacing the alternator, battery, cables and part of the harness

10-29-2008, 11:15 PM	#1 (permalink)
1990celicagts Location: Richmond Hill, Ontario Posts: 854 Join Date: Oct 2003 Last On: 05-10-2013 12:54 PM	battery gauge goes up and down? My battery gauge goes up when I am driving (higher RPM) and goes down when idling (LOW RPM). Is this normal? I have tightened the alternator belt as much as I can. __________________ 1990 Celica GT AND 1996 Tercel Last edited by 1990celicagts : 10-30-2008 at 04:48 AM.

10-30-2008, 01:30 PM	#2 (permalink)
gerby77 Location: Vaals, The Netherlands Posts: 153 Join Date: Oct 2008 Last On: 10-30-2009 07:07 AM	Re: battery gauge goes up and down? Well, to be true, i have seen this only when i.e. i'm in front of a trafficlight and i want to go left or right and my directionlight go on and off. It can ofcourse be, because during higher RPM the motor of your car makes the alternator belt run quicker, which means, more power produced. What do the other guys think about my explanation? ;-)

10-30-2008, 04:00 PM	#3 (permalink)
RaidenDB Location: ontario Posts: 165 Join Date: Aug 2008 Last On: 01-16-2011 01:19 PM	Re: battery gauge goes up and down? I think your battery is about to go. Try a different battery if you can.

10-30-2008, 07:32 PM	#4 (permalink)
jlspec Location: San Diego, CA Posts: 101 Join Date: Nov 2007 Last On: 10-08-2011 11:43 PM Vehicle: 1990 All-Trac 2nd Vehicle: 95 Prelude Vtec	Re: battery gauge goes up and down? Battery and alternator are going. Replace both. __________________

01-27-2009, 02:06 PM	#5 (permalink)
awhite83 Location: boston Posts: 2 Join Date: Jan 2009 Last On: 03-15-2009 08:59 AM Vehicle: 90 all-trac	Re: battery gauge goes up and down? I know what it is it happened to me. it's called a voltage regulator it's inside the alternator but you can't just replace that you have to replace the whole thing and if you do that and it is still doing then there is a bigger electrical problem and you will have to go through the entire system. i had to do that i ended up replacing the alternator, battery, cables and part of the harness

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