I had the exact same problem with my 1999 tahoe.
I removed the battery terminals and they were badly corroded.
A simple scraping with a pocket knife and then a baking soda and water bath
to polish the connections.
walla walla, perfect starts, runs forever and cheap.
The battery never failed to start the vehicle, so i never thought the
battery terminals were that bad. WRONG!!!!
So clean them and go driving.
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