g35-03 has to be jumped if not started for one day

[milljj]

Our g35-03 would periodically not start. Dealer (and another mechanic) couldn't find anything wrong -- battery tested fine, etc. No one could find any drains on battery. Dealer suggested changing out audio system for about $800 and that "may" eliminate the problem. During the winter, the problem seemed to disappear. This Spring, problem has resurfaced with a vengeance and now the car won't start if it hasn't been driven for a day. When jumped, the car starts immediately and is then fine during the day, even with lots of starts and stops. While parked in the garage over night, car is not likely to start next morning. HELP!!!

[Kendahl]

I have had old batteries do the same to me. They work during the day because they get recharged every time you drive the car. Overnight, they pretty much die. Did they perform a load test on the battery? That's the only way to identify a battery that is sick but not completely dead.

[telcoman]

Our g35-03 would periodically not start. Dealer (and another mechanic) couldn't find anything wrong -- battery tested fine, etc. No one could find any drains on battery. Dealer suggested changing out audio system for about $800 and that "may" eliminate the problem. During the winter, the problem seemed to disappear. This Spring, problem has resurfaced with a vengeance and now the car won't start if it hasn't been driven for a day. When jumped, the car starts immediately and is then fine during the day, even with lots of starts and stops. While parked in the garage over night, car is not likely to start next morning. HELP!!!

You need one of these


A battery hydrometer is a cheap tool and can show you battery cells not accepting a full charge

You will probably see a weak or dead cell

How old is the battery?
Did you measure the alternator voltage with the engine running? Should be around 14.3v

Telcoman

[SVTCOBRA]

Welcome to Nico!!
What brand battery do you have?
What is the date stamped on the side?