Sorry but batteries don't just go dead for no reason ! A parasitic draw on the electrical system ,do you know what that is ? Do you know what control modules are ? PCM/ECM , BCM , EBCM , SRS , HVAC etc .. After key is switched off these modules power down (go SLEEP) , sometimes they don't . This causes an electrical drain on the system causing a dead battery . I will admit some guys on here do jump the gun a bit . Never I repeat NEVER replace anything on a vehicle without testing . Load test the battery first .
SOURCE: Works with charged battery. Then goes dead. 89 volvo 240
this is a re-post for a solution i posted to another person here,I am a mechanic so please try this out... follow the positive battery terminal to the starter and then look on top of it and there is a solenoid and a small red wire to it with a small nut.See if its loose and if so tighten it. Also check both of the battery post's terminals by removing them and cleaning them inside with a metal brush and also the battery post's with a small round brush they sell in any auto parts then place them back and just tighten slowly until you feel them not too tight so that they wont break the outside nut then start your car and see if this works!
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