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My RB25 »
https://forums.nicoclub.com/my-rb25-u61932.html
Sat Feb 16, 2008 10:47 am
How old is your battery? The normal battery life is anywhere from 4-7 years, usually around 5.
Also easy to do alternator test. Start up your car, get a DVOM (Multimeter), set it to voltage (sorry can't remember AC/DC, I think it's AC. I just know the picture on mine.).
Put the + lead to the + terminal on the battery, - to -, obviously. See what voltage you have. 14.0-15 volts is good. Now turn on the accessories in your car (Radio, rear defroster, high beams, blower (fan)). Now see what the voltage is. Anything below 13v's = New alternator. 13.5 is pushing it. Also normal battery voltage with the car off should be around 12.6 volts.
Hope that helps