Question about 1997 Isuzu Rodeo

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Draining battery alternator had checked, bought new battery.When i start the truck voltage is down and the battery, gas,and brake light stay on. I go to speed up and lights go off and when i sloww or stop they come back on it ruined my one battery. Thatswhy i bought a new one today but its doing the same thing.

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I had a 1997 Isuzu Rodeo. We thought, it was the alternator, instead it was a faulty coil within the alternator. Although they try to say this problem was not covered under warranty, lucky for me, it was. I continued to have other problems, until I just finally gave up, and gave it back to them. Too many headaches.

Posted on Jan 03, 2009

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I think the problem is not with the battery,you better send your car to the workshop to fix it...i think the problem is on the wiring..

Posted on Nov 10, 2008

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96 cadillac eldorado etc battery not staying charged when the car is started the battery goes up to 14 when driving and press brake voltage drops 11-12(car may even die) and to 13+ if u give it gas

Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

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My 92 GMC won't keep a charge after i bought new battery and alternator. Checked all wiring and fuses still stays around 10 volts with new battery and alternator

Did you check for B+ voltage at the alternator with DVOM - digital volt ohm meter ? The heavier gage wire on the back of the alternator should have battery voltage on it. How wires are there in the connector at the alternator ? Does the battery symbol light lit up on the instrument cluster with the key on engine off ? Does the light go off when vehicle is started ?
1992 GMC what ? Look for blown fusible link at battery junction block located on the fire wall near or behind brake booster !

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71 c10 not staying charged... new battery alternator fuses good and new voltage regulator

Maybe it wasn't running long enough to charge up the battery?
Stop trying to jump it, when you are having problems with it dying, take the battery off and have it charged. And/or buy a $20 voltmeter to see what the battery shows. If it says less than 12 volts, it is discharged, and needs charging. A good battery that is not run down should have at least 12.5 volts. A new battery that is charged should have very close to 13 volts, maybe 12.8 volts.
When you have the truck running, check the alternator for charging. You put the voltmeter right on the battery and check it again. This time, with truck running, battery should show at least 13.5 volts. That shows the alternator is working. A good alternator will put out about 13 or 14 volts-the regulator will keep it from going any higher to prevent problems, like a melting battery or electrical parts burning out.
I would say get the charging system working right, then address the problem of dying at stop lights. That could be a carburetor problem, if the alternator is working.

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Battery dains when not running

The battery current draw may be caused by a few things, here are some to check: the most common is that a light stays on like the dome light, the brake l;ights may be staying on,aftermarket accessories can cause it as well, audio amplifiers or stereo equipment or aftermarket alarm systems, very common.

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I have a 2002 mitsubushi montero sport. The brake/battery light won't go off. I replaced the battery yesterday and car starts and stays running but lights seem a little dim and the dang brake/battery...


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I have a 2002 Mercedes Benz C240. My car won't start every now and then and have to charge up the battery. Thought the battery might be bad so bought a brand new battery and still happens and gets a...

Hi there.
You must have a drain some where.
Make sure the brake light are NOT staying on. if they are, it will drain the battery. this is due to faulty brake light switch.
I think the ESP light is related to the brake light switch.

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I have a brand new battery in my 2000 Honda Civic & the car will not start now. The battery was installed 2 days ago & the car started just fine & ran fine, but then I didn't drive it for 2...

Check the function of the alternator. Charge the battery with a battery charger or jump start the engine. While the engine is running use a voltmeter to check the voltage at the battery posts. Red to + and black to -. You should have between 13.5 − 16 volts. If you do not the alternator is bad or the drive belt is loose. If the alternator checks ok then something is on that is drawing power from the battery and running it down. Check under hood, trunk, glove box, and interior lights. Can also be a brake light switch causing the brake lights to stay on. In rare cases it can also be a stuck relay such as a power window relay. From you description I think you will find the alternator is ok and your problem is something is on and running the battery down.

Jan 06, 2010 | 2000 Honda Civic

2 Answers

Battery keeps draining and car won't stay running

Check the alternator out put.Also the alternator could have a bad voltage regulator,or diode gone out,would cause this problem.Out put should read 13.75 to14.25 .

Aug 07, 2009 | 1999 Audi A6

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Battery light

Check to see if the belt has broke that drives the alternator, if it has not broke, Then check all electrical connections to the alternator. Last take the alt to the shop to have it tested.

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1 Answer

1995 Suburban Electrical: Battery is being drained.

The alternator is usually the culprit when nothing else has been modified. However yo mentioned changing it. (actually the regulator inside the alternator usually fails and drains the bat when the engine is off) However there is a very common issue with mid 90's gm trucks, the brake switched go bad and cause the brake lights to stay on. Try lightly touching the brake pedal and see the lights go off after slowly releasing it. the fix is a new switch that fairly easy to replace . These are mounted on the brake pedal arm just above your foot.

Aside from these two issues, you will need to trace the problem to its source by taking items out of service one at a time by removing fuses. not that the engine computer and the radio will always draw power at start up and a tiny clock current thereafter. But there should not be anything else. The voltage guage is not very accurate in the dash. Use a volt meter to watch voltages unplug fuses until the voltage goes up. without the vehicle running, voltage should be between 11 and 12 volts on a charged battery.

And finally, check the grounding. There should be a ground strap between the engine and vehical body in addition to the battery cable. If this is broken or missing it will cause errant readings of voltage in the dash.

I hope at least one of these tips works out for you.


Dec 21, 2008 | 1995 GMC Suburban

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