The same shop that tested your battery, or a FLAPS like autozone, does free alternator tests either on or off the truck. Just take the truck, or the alternator, to them and tell them you think its bad, they'll hook it up and tell you.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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