Question about 1999 Chevrolet K1500

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Battery is not staying charged. It is an old battery. jump starts quick. when vent blower is on battery does drop in voltage to 12 instead of 14 when at an idle speed. Is this a dead battery or a faulty alternator ?

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Drive to autozone or like parts supplier...they will test battery and alternator output for free...do not disconnect alternator while enging running....this is an old trick for early cars with generators...it can actually damage your alternator.....

Posted on Feb 09, 2009

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2009 451 Passion. Why a frequent dead battery?


That is definitely wrong, not normal. Voltage should stay at 14 volts or near that until the battery is close to fully charged, then will slide down to about 13.5 volts, and stay there while engine is running. Also, a fully charged battery should show about 12.6 volts at a minimum, especially a new battery.
I don't know what is going on with your system. Take it back to Merc- were they aware of how it is acting, voltage-wise? Doesn't sound like it. One small possibility: is your alternator belt not tight enough?

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If you have a voltage tester check the voltage of the battery after you charge it. it should be 12 volts with the car off. then start the car it should read about 14 to 14.5 volts if the alternator is working. If the voltage stays at 12 its not charging and if it only jumps up a little its not charging enough to charge the battery

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How do I check if it is alternater or battery


if wont jump battery has internal short and is bad replace with good battery get cheap ohm meter to test alternator out put. install battery ck voltage start engine ck voltage should rear 13-14 volts if not charging will read battery voltage with steady voltage drop. running with neg. cable unhooked can cause damage from voltage spike.

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I am taking it you have a new battery. You put on a alternator. Now you need to charge the battery until it is fully charged. That way the car will run for a while before it stalls from undervoltage. With the battery charged check the voltage at the battery. It should be 12 to 13 volts. Now start the car and check the voltage it should be up to almost 14 volts. If that is good check with lights and heater blower on should be at least 13.5 volts. If the voltage does not increase you either have a bad alternator or it is not getting excited by the ignition switch on the vehicle. So you should find the wire that energizes the alternator and turn the key on it should have 12 volts on it. Hope all this helps. please rate my answer so I get points.

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Because of the load. It will drop in voltage, this is normal. As long as it stays above 12 you will be fine. But just to be sure start the car and turn everything on, then check the voltage. If it stays at 12.7 it's good.

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Driving and shut off while driving could turn on with key but here clicking sounds wouldnt turn over would this be the pcm


Sound like the alternator went bad and is no longer charging. Are the headlights dim? Have you tried jump starting? Have you measured battery voltage while you try to crank it over? If it drops below 12 volts the battery is dead. If it starts with a jump you should see around 14 volts at the battery with the vehicle running. If you see less the alternator is no longer charging.

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Replaced battery. still would not start. Cleaned treminal of all corrision. cranked fine. however 1 day later would not start. jump started . drove a couple of miles but when I turned on lights, engine...


Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.

I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike

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1 Answer

Car will start when it is being charged, after charger is removed car still runs, when car is shut off it will not restart


could be battery or alternator. Check voltage at battery with engine running. Should be at least 14 volts. If yes, alternator is working.
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Sounds like you have a bare wire somewhere that is touching metal and grounding out. Probably a starter cable. Try unhooking the battery, check the voltage of the battery, then hook the cable back up, watching for sparks from the cable. After you get it hooked back up, check the voltage again. If you see a small spark, it is normal. If you see a big spark, you have a wire that is touching something it is not supposed to.

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