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Trouble shooting batt.light on 2002 trailblazer,if I disconnect neg. batt. Term. & car dies, does this mean bad alternator?

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  • Cars & Trucks Master
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If battery dead will do the same either go to an auto store most offer the services for free or get a meter and test them

Posted on Dec 15, 2016

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1 Answer

2002 malibu battery light stays on replaced alternator and belt no help


Batt probly not chargn cause main wire in back of alt is wornout. Alternator tho sounds bad..it will drain a battery quik.Disconnect batt ovenite to confirm

Sep 26, 2016 | 2002 Chevrolet Malibu

1 Answer

Chevy venture draining battery


The alternator is out. The ONLY time your vehicle uses battery power (while the engine is turning) is during start up. After that the alternator runs the car.

With the car running put a volt meter on the alternator. Red lead on the big nut on back side if alt. Black lead on the neg batt cable or a good body ground. Voltage should be around 14.5v DC.
Then still with engine running, red lead to batt postive, black lead to batt neg. Voltage should read the same. 14.5v DC
If not, the alt. Is bad

Dec 31, 2012 | 2002 Chevrolet Venture Passanger

1 Answer

Gauge showing low output alt only 1yr old wondering if it could be regulator or batt or wiring


if you have access to a digital multimeter, connect the meter (set to volts) across positive and neg. terminal of the battery, should read roughly 12.6 volts, close to 10 volts, battery may be going out, also test the alt output, disconnect neg term and place negative lead to battery neg post and positive lead to neg battery cable (make sure meter is set to amps) should read near the rating, if both those, then you'd want to do a resistance test, (set meter to Ohms) disconnect battery and connect meter neg to either pos cable terminal or where the pos cable connects to the alt and connect positive lead to opposite of neg, should read next to 0, the check resistance of the ground by connecting meter between batt neg cable and body of alt.

- Spenser

Apr 04, 2011 | 1988 Ford F 250

1 Answer

Brand new battery. If I do not drive it for one day the car goes completely dead. No power what so ever. No lights, will not turn over... no anything. Is it the alternator as the voltage regulator is...


If it was an alternator related problem the car would die while it was running. it could still be a bad battery. i have gotten a few new batteries that were bad.

try this:
-drive the car for about 15 mins to make sure the battery has a good charge
-after you park it, then disconnect the (-) neg cable from the battery
-let the car sit over night with the battery disconnected
-the next day hook the (-) neg cable back up to the battery and try to start the car

if the battery is good, it will start normally
if its bad you'll get the -no start- problem

If the battery is good, you have a parasitic drain some where in you electrical system.

Jan 21, 2011 | 2002 Ford Mustang

2 Answers

Installed new baterry and new alternator...battery or alternator dies in one day


the alternator will not die in one day unless there is a direct short causing diode or coil winding failure which would give signs of smell, melted wires. Disconnect battery and give full charge. what year is this? while vehicle is running you should be able to briefly disconnect positive battery post connection and vehicle will still run if alternator is good. For a new battery to die in one day, one of two things i think has happened. Either the batt is faulty from supplier,( not likely but i have seen it ) or there is a direct draw or grounding taking place whether its direct in the starter selonoid or a direct draw through accessories. Are you sure all switches are off ? Push switches (on interior lights) nothing like dome lights,delayed lights are staying on! Does vehicle start hard like it almost needs a jump. If it has to be (and it takes time). to find out what is drawing the power ( i am old school) disconnect positive power source on batt. 2) disconnect ignition power source on starter. 3) connect pos batt wire to starter, 4) touch positive cable to positive batt post and look for spark or contact. if this reacts then selonoid or starter motor is shorted drawing the current. Or if you have volt meter and know how to use it, this is good to. If checks good then hook ignition connection back on starter.(disconnect pos terminal on batt prior to re-connect) I think the battery is having the life sucked out of it by a short in the system ( A DRAW ) this could be a quick find or fix or this could take days to track down. alot of variables here to try to explain. but i would seek into the starter first as usually this drains the battery quickly .

Jan 13, 2011 | GMC K1500 Cars & Trucks

1 Answer

When the car is left overnight the battery is flat the next day. Also the dash boad lights are on indicating a problem with the brakes and the airbag.


START THE CAR, CHECK VOLTAGE AT BATTERY WHILE RUNNING AT HIGH IDLE. VOLTAGE SHOULD BE SOMEWHERE BETWEEN 13.80 TO 14.80 OVER 14 IS BETTER. IF THAT IS OK THERE MAY BE A BATTERY DRAIN. TO CHECK FOR A DRAIN, TURN OFF ALL SWITCHES, CLOSE ALL DOORS , INCLUDING GLOVE COMP. DISCONNECT NEG. BATT. CABLE, PUT 12 VOLT CIRCUIT TESTER ONE END ON NEG. BATT TERM. THE OTHER END ON THE NEG CABLE. IF THE LIGHT COMES ON THERE IS A DRAIN. NO LIGHT - NO DRAIN. IF NO DRAIN HAVE THE BATTERY TESTED AT A CERTIFIED ELECTRICAL SHOP

Jan 02, 2011 | Peugeot Liberte Cars & Trucks

1 Answer

My battery light came on while I was driving. I noticed that the needle on the battery gauge kept going down as I drove home. How do I tell if I need a new battery or if it's the alternator?


usually if you remove neg cable while car is running and it dies the diode in alternator is bad.take to parts store and have a tester put on batt its free

Sep 06, 2010 | 1999 Chevrolet Blazer

3 Answers

Battery dies after sitting for a few hours. Any idea what is draining it?


disconnect battery put a test light between neg of battery and neg of cable if it lights u have a draw if so take out inter lamp fuse if still there put test light back on batt and cable and start removing fuses till lamp goes out then u know what cirit is drawing
common causes glove box lamp int lamp trunk lamp radio good luck

Nov 26, 2009 | 1995 Jeep Grand Cherokee

2 Answers

Flashing battery light on the dash


check batt volts if under 13volts batt needs replaced.
one other test u can do is to check alternator by undoing neg batt cable when car is running, if car dies alt is bad. cars dont need batt to run just to start :)

Sep 24, 2009 | 1985 Volvo 740

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