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cowboyro
Premium
join:2000-10-11
Shelton, CT
reply to fartness

Re: Do I need a new battery?

The battery is likely failing. At 5 years it's not at all unexpected. The alternator may be feeding enough current to make up for the consumption at higher-than-idle speed, but once it dips a bit the battery can't hold.
I bet that if you test the acid you'll see it having lower than normal density in at least 1 cell.



fartness
computersoc dot com
Premium
join:2003-03-25
Look Outside

Can this ruin my alternator if the battery is failing?

Will there be any warning to failure, or is this it, and one day it just won't start?



cowboyro
Premium
join:2000-10-11
Shelton, CT

said by fartness:

Can this ruin my alternator if the battery is failing?
Will there be any warning to failure, or is this it, and one day it just won't start?

Ruin - no.
Warning - maybe yes, maybe no. You may find the car harder and harder to start or one day it may not crank at all. YMMV.