I have a 1994 Honda Prelude Si H23A1. The battery light comes on and off, tends to stay off when the car is held at a steady RPM above idle. The wipers are also slower, power windows are as well. This has been happening for maybe two weeks now, car still starts up fine no issues other than the light and slow wipers and such. Battery is about a year old. Alternator is the stock denso unit as far as I know, if it is it has 220,000 miles on it.

 

Sounds like you need a new alternator.

 

Yeah I figured. It's just so intermittent I thought I would get another opinion. Like this morning I started the car, no battery light until 20 minutes of driving then it came on again then went off again. Makes me see the usefulness of a gauge instead of just the light for battery. Am probably going to go to a junkyard and look for another denso alternator, they are very expensive new and I have heard the cheaper alternators like pure energy for example aren't the greatest.

 

had that issue and my voltage was reading less than 13v with the car on.

i replaced the brushes in the alternator to fix it.
it cost a few bucks only