My car was sitting for about a month and when i went to check on the car and its dead. soon as i put the jumper cables om the battery and everything started working but still wont start. When i turn the key i can hear the starter trying to turn over but then starts a clicking sound. I got the battery tested at auto zone and they said it was a good battery. And the alternator i just got. I do have some corrosin on the battery , could that be the problem for no power without having jumper cables connected and for the car not starting

 

Welcome to the forums!

Absolutely it could. If the terminals are corroded, the bestest of batteries can't get power through the corrosion.

Please peruse The Amelioration:
https://themustangsource.com/forums/...4/#post6917899
Fixed me up, I do believe it's helped plenty others as well. Cleanliness is next to good-charging-system-battery-and-starting goodliness.

If it doesn't fix ya up, then you have diagnostics of major pain in the posteriors with a multimeter or power probe or even test light to do to track it down. May even involve a scan tool for live data and/or a good mechanic who does electrical really good.

I hope that helps ya. Good luck!

 

my first suspect is always the battery, even when one of those part-store tests says it is good they can be bad . . . how old is the battery?