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autozone for free alternator and battery checkup with their testor.
I just bought a 135amp handheld testor,, an old school type for 40$ minus 15% coupon avail online for harbor freight testor. I wanted something to put a load on the battery to get easy display on a meter how alternator and battery were doing besides just volt meter. Batteries being $100 or more these days I didn't want to just throw new batteries at a problem if my alternator was at fault. Although it's about 3 to 1 if there is a problem its the battery vs alternator or belt.
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