Is it the ground wire??!
My 2001 Pontiac Grand Prix wouldn't start, we went to jump it and the lights came on kind of dimmed, no radio or A/C. When I turned the key completely to turn to car on, everything went off. No clicking noises, nothing.
Maybe the battery terminals and cable ends need to be cleaned and tightened.
How old is the battery? Have it load tested. If it's more than 5 years old it might be time for a new one.
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