Question about 1985 Honda Prelude

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85 Honda Prelude Battery keeps dying

We have replaced alternator, voltage regulator and new battery. What else could possibly be the problem?

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  • Roberta Smith
    Roberta Smith May 11, 2010

    when exactly does the battery die... overnight ?




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Check for electric short.
if you have factory or after market alarm, that may be the cause.

Posted on Jan 09, 2009


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Posted on Jan 02, 2017


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1994 honda accord new altanator ,engine dies when battery is disconected

If the alternator is wired correctly and working,the vehicle will keep running if nothing else is switched on at idle speed.
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are you saying that you got this battery from autozone? I went thru three batteries in a week from autozone because the lot# was bad. It,'s quite possible that you have either a short that is draining the battery or that the alternator isnt charging properly. To do a fast check, start the car then remove the positive battery cable with the car running. If it stays running, theres a chance its ok. If it dies, It's most likely the alternator or the voltage regulator Diods. On most cars, the voltage regulator is built into the alternator. I would take it to autozone and have the charging system checked

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Do u have the carbureted or fuel injected model? (both were available that year) The carb. model has a separate voltage regulator which is mounted on the right front shock tower. The fuel injected model is inside the alternator, under the end cover.
Have the alt. tested before u purchase a new one to make sure that's the problem. Most parts stores will check it for free. Be sure to disconnect the neg. battery cable before u start to remove it. Let me know how u make out. Curt

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Battery? Alternator? or what?

Hi and welcome to FixYa,

Initially, it could be the alternator or more specifically the voltage regulator inside the alternator. The function of the alternator is to produce the necessary charging voltage to replenish the charge of the battery. This voltage is then funneled and controlled by the regulator. Of course even if the alternator/regulator is good, there could be other possible reason(s) why the battery looses or is not charging such as loose wire/connector/terminals or a partial electrical short/fault draining the battery when parked.

To crank (turnover) the car's engine, a starter is used.

Good luck and Thank you for using FixYa.

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