Question about GMC Jimmy

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Running down battery. unhooked battery negative and installed a test light to check off draw. test light stays lit brightly and lights in cluster flash constantly.all doors closed,interior lights off and key out of ignition.its a 2005 model 2 door.any suggestions

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  • Anonymous Mar 31, 2014

    lights and radio stay on when door is opened with key out of ignition truck has a new battery even unhooked wiring harness for igniton but lights in instrument cluster stayed on headlights went out until ignition wires hooked back up

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  • 38 Answers

Bad voltage regulator or bad alternater

Posted on Aug 02, 2009

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On a 2004 Buick rendezvous there is a little red light that keeps blinking expect when the car is running. I'm pretty sure its draining my battery. Any suggestions?


That little red light is your anti-theft system and it does not drain enough power to drain your battery unless your car is sitting for a year. I would check for a draw. Unhook your negative battery cable and hook a test light between the cable and the negative terminal. If the light lights up brightly, then you have something draining the battery at a significant rate. I start by unhooking the main cable off of the alternator, this is a prime place to start for a battery drain. If unhooking the alternator does not dim the test light then move on to the power distribution center and pull fuses and relays one at a time until the light dims, this will at least narrow down the circuit that needs attention.

Feb 25, 2016 | Buick Cars & Trucks

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I need a picture of the fuse box,with cover off to identify a red wire on left hand side of box to see if it feeds to the area of #32 and #33 fuses some thing is draining my battery


The easiest way to check for a draw at the battery is to unhook the negative battery cable and hook a 12v test light in between the negative post and the negative cable. The light should light brightly if there is a significant draw. You simply unhook circuits till the light goes dim, or out. I always start at the alternator, even if it has tested good. An alternator can still charge with a burned out diode which will cause a direct short to ground and drain a battery like nobody's business.

Feb 16, 2016 | 2004 Chevrolet TrailBlazer

1 Answer

My battery is drained when left for a few days


You either have a weak battery that will not hold a charge or you have a draw on your battery that is using power when the vehicle is off. The best way to look for a draw is to unhook the negative battery cable and put a test light in line, clip the end of the test light onto the battery post and the probe end onto the cable, if there is a draw the light will light, if it lights very dim then this is known as a parasitic draw, which is common for things like the computer and the clock, but if it lights bright then you have a problem and need to trace down the circuit with the problem. You can usually accomplish this by pulling fuses one at a time and watch for the light to dim. Start with the distribution center under the hood and move to the interior fuse panel. Also, I usually start be unhooking the main supply wire for the alternator as this can be a common source for a power draw, If you do not find a draw on the battery a hydrometer can tell you about the health of your battery and if it is in need of replacement.

Nov 13, 2014 | Honda Civic Cars & Trucks

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Honda 2004 CRV seems like it has charging problem. Replaced battery and and Alternator. Fine for 2 months, now having problems starting. Something is draining that battery when it sits in garage. ...


I doubt the actuator, but not positive. I think it would be buzzing or clicking if it were drawing current.
So new battery and alternator. Assuming no problems in the charging system, you may be right about the drain. Here's how to check for the so-called parasitic draw, or unintended drain: Having just gotten home or having run the engine a good time to assure the battery is fully charged (about 30 minutes at least), shut off the car and open the hood. If there is an under hood light, take out the bulb. Now let the car sit for a good half hour, key out of ignition, everything off, to make sure the engine computer has gone to sleep, and all systems are shut down.

Take off the negative battery terminal and hook up a test light or voltmeter between the negative cable end and the negative battery post. If there is a drain, the test light should be bright, or voltmeter will register voltage. There is always a very small electrical draw on the battery from the keep alive memory for clock, radio pre-sets, computer memory, and the security system. But this should only be milliamps (less usually than 100 milliamps-not enough to drain a battery for a long time, less amperage than a glove box light bulb would draw). The test light should not be lit, or if affected by this milliamp draw, would have a very, very dim bulb glow.

If the tester lights up bright, there is an unintended drain. To find it, start pulling fuses one at a time, watching the test light. When a fuse is pulled and the test light goes out, you have found the problem circuit. Check a wiring diagram to see what all is on that circuit to find the problem.
Now if you did not find a drain, then have the charging system checked. Good luck, hope you find it.

Oct 30, 2013 | Honda Odyssey Cars & Trucks

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Car has to be jumped off every morning ,even after i have bought a new battery ,new alternator and new belts. something is killing my battery overnite.please help.


Check trunk light, glove box light, underhood light-make sure they're all off.
Here's a test you could try. Take the bulb out of the under hood light, and leave hood open. Turn off the car and lock it as you usually do. Wait about 20-30 minutes, so the computer goes to sleep. Now take off the negative battery terminal, and put a test light between the negative cable end and the negative battery post. If you have an unintended draw on the battery, the test light should be brightly lit. If it is, start pulling fuses one at a time until the light goes off. The circuit for the fuse that turned off the light when pulled is the problem. Figure out what all is on that circuit to check out what is staying on.
I should add that if the test light is very dim, that may not be the problem, because the keep-alive memory for the computers, the radio pre-sets, and the clock would all draw a tiny amount of electricity-not enough to drain a battery if working right, and only measured in milliamps.

Aug 12, 2013 | Mercedes-Benz CLK Cars & Trucks

1 Answer

Battery runs flat


Power drain is never fun to find. The easiest way to track down your draw is to remove the negative battery cable and hook a 12volt test light between the cable and the negative battery post. The test light will light up showing that you have a power draw. I will usually start by unhooking the alternator as it is quite common for the alternator to loose a diode internally making for a dead short, but still able to charge with engine running. Anyway, unhook the alternator and observe the light. Does it get dim or change at all? if so, replace the alternator. If not, hook the alternator back up and move to the under hood power distribution center. Remove one fuse at a time and look at the test light, if you pull a fuse and the light goes out then you have at least narrowed your search down to one circuit. from there look to the owners manual as to what is associated with that fuse circuit and look for your short.

Apr 24, 2013 | 1996 Nissan Sentra

1 Answer

I have a battery that goes dead overnight and am told that the starter is shorted causing the problem. I pulled the starter out and had it tested and was told there is no problem. I load tested the...


If the battery failed a load test and the load tester was set for the correct battery CCA (cold cranking amps) then the battery is not any good, and if you can dis-connect the battery and using a volt meter you can watch the battery voltage drop off until it is below 12 volts, then the battery is once again not any good and that battery most likely has an internal short or a bad cell and that alone would cause similar symptoms.

The alternator could cause a draw on the battery, but the starter will not unless it is engaged all of the time, and if the mechanic at the service station that you went to does not know that, then you might want to consider another repair facility.

There might be another draw on the battery and the best way to find it would be to dis-connect the negative side battery cable and connect a test light between the negative battery cable terminal and the negative battery post. (see image)

With everything turned off and the doors closed, connect the test light between the negative battery cable terminal and the negative battery post, and the test light should light up bright for a few seconds and then dim down very low to almost nothing indicating that only the KAM (keep alive memory) for any control modules and the stereo system is active and drawing power from the battery and this is a normal condition.

If the test light does not dim down to almost nothing, and the test light stays bright or only partially dims down, then there is a draw on the battery from the vehicle electrical system, and the best way to locate it would be to start removing the fuses/relays one at a time (replace the fuse/relay if there is no change in the test light) and observe the test light, and if you do remove a fuse/relay and the test light does dim down to almost nothing, then the draw will be in the circuit that fuse/relay controlled, and if there is still a draw on the battery after removing all of the fuses and relays then start dis-connecting power accessories like the alternator one at a time until the test light does dim down until the test light is just barely making the filament in the test light bulb glow.


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Sep 07, 2010 | 1997 Cadillac DeVille

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My 95 blazer 4x4 4.3 engine has a battery drainage problem when it sits all night,i had the charging system checked and it was ok.I tested all the fuse's with a tester with the key off,and more then half...


you would want to make sure everything is turned off in the truck and doors are shut. Take the positive battery cable off, connect a test light to the positive cable and the other to the battery, if there is a drain, the test light will light. Try pulling 1 fuse at a time til the test light goes out. Also have the battery tested to make sure it holds a charge.

Mar 07, 2010 | 1995 Chevrolet Blazer

3 Answers

What could be dragging my battery down after 2 days of not starting it?


Lots of stuff. An after market alarm,malfuntioning radio,bad battery,bad door pin switch for the interior lights. Best thing to do is charge the battery if it's in fact good, thenunhook the negative battery cable & connect a test light from the disconnected cable to the negative battery post. If it's a nice bright light it's got a draw. If it's really dim,that's the memory for the computer,anti-theft,radio memory. I mean dim,like barely lit! That's ok. If you don't have a test light disconnect the negative cable & touch it to the negative battery post a few times & if there's a big spark,there's a draw. If there's a draw & there's nothing on in the car,like an interior light,etc, than start with the inside the car fuse box & while holding the open door pin switch test each fuse for power. If anything has power that shouldn't with the key off that's where to start. Do the same for the under the hood box as well but disconnect the hood light. If you are using the Viper alarm system,junk the system. That alarm causes your problem & in alot of cases a fire.

Jul 22, 2009 | 1995 Chevrolet Camaro

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