Two things I can think of:
1. The ground strap fromthe engine to the chassis is disconnected, corroded, broken or otherwise not grounding. This would also be true if you had the NEGATIVE battery cable replaced with a "generic" black cable that didn't have a "pigtail" on it, which goes to the chassis ground.
2. The battery may indicate 12 V, but the post may have a crack inside the battery.
3. ok, a third: The battery cable connection(s) are dirty. Remove each cable and clean them and the posts; try again.
I really hope this helps!
Testimonial: "Thanks to both posters. You were both correct. The negative cable had a bad connector at the ground on the block."
Will it jump start?
if so bad battery, if not bad connection..
Testimonial: "Thanks. Bad ground connector at the block."
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