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Weird Battery Light

 
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Old 09-10-2019, 07:14 PM
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Weird Battery Light

Hey all,

I have a '93 SiVTEC, 5spd with 248K. Three weeks ago, my battery light started to come on when I'd take it out of gear at a light. The revs would drop below 1k at the same time. As soon as I increased the revs, the light would go off. Over a week though, it got worse and I ended up replacing my 9 month old alternator (from Autozone) after it failed the screwdriver test.

Put in a new alternator from Rock Auto and the problem mostly went away. Now, the light comes on occasionally under the same conditions, but when the revs increase without me touching the gas, the light goes off.

I'm not sure what's going on. The battery is almost 4 months old. I think something may be loose in the battery to alternator loop, but want to see if anything sounds familiar to anyone here. Any help is appreciated.

Last edited by 74Stylez; 09-14-2019 at 01:45 PM.
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Old 09-11-2019, 10:54 PM
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Re: Weird Battery Light

how old is your battery? may want to have it load tested to insure its actually holding a charge.

also have you checked your charging volts while the car is running.
should be anywhere from 12.5v-14v
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Old 09-14-2019, 01:44 PM
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Re: Weird Battery Light

Thanks for the response abelsgotspeed.

I just bought the battery in June. I had it tested on the car the day of my original post. I took it off and had it tested on Thursday. Both times it tested good.

I talked to the tech who tested it the second time about this problem and after verifying that the alternator connections were tight, he suggested that the distributor cap and rotor might need to be replaced. I haven't replaced those since 2012, so I decided to give it a try.

Just switched out the rotor and cap this morning and took it for a thirty minute drive. No battery light at all, even when the revs dropped below 1k. I'll keep an eye on it during the next week, but it looks good so far.
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Old 09-17-2019, 06:02 PM
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Re: Weird Battery Light

Well, I drove the Prelude every day since I put the new rotor and cap on this past Saturday with no battery light. It flashed 3 separate times today after I had taken it out of gear and was coming to a stop. It went off as usual when the revs increased.

I don't want to keep throwing money at the vehicle, but what else could this be?
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