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    Battery/alternator help please

    So i know for a fact that my car battery is almost dead, since i drained it once a few months ago by leaving the lights on, and i also had the car sitting for 3 months last year when i blew the engine. Here is the diagnosis, the car starts up fine, but when i drive the lights dim when the revs drop below 1000. The battery after sitting over night sits at 12.6 volts i believe. When coasting and i let off the gas, whenever the revs go below 1000 the lights dim, everytime. anything over 1k and hte lights do not dim at all. Sometimes if the revs drop low enough, the car will feel like it will stall out and sometimes it does. What do you all think is the problem?

    please, any input will help







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    Re: Battery/alternator help please

    bad alt/bad battery/both



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    Re: Battery/alternator help please

    what kind of car? stock or aftermarket alt?



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    Re: Battery/alternator help please

    Do new battery first, if still doing it, then most likely you have a bad alternator.



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    Re: Battery/alternator help please

    honda civic, stock alternator




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    Re: Battery/alternator help please

    Sounds like the alt is going bad. Have it load tested at Vatozone.




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    Re: Battery/alternator help please

    ok so today i went to start the car, voltage was at 11.8 volts, then when i started it up, 13.6 and driving 13.6. when i let the revs fall, it goes to low 12 volts




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    Re: Battery/alternator help please

    Charge batt fully with a charger. alt cant do that you know. Then test voltage if still 11.8 after a full charge replace battery.



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    Re: Battery/alternator help please

    Quote Originally Posted by joker4096 View Post
    ok so today i went to start the car, voltage was at 11.8 volts, then when i started it up, 13.6 and driving 13.6. when i let the revs fall, it goes to low 12 volts
    11.8V is to low. Either the battery is shot, or the alt is no good. Have both load tested at Vatozone.




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    Re: Battery/alternator help please

    Ok so i did the big 3 (was actually 4 wire upgrades) today and gained a few points. with the engine running at idle it was at 14.1. so that helped a bit and later I'm going to get the load test done




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