i have a 95 rodeo. i took it to auto zone and they said the battery was good but the alt was only putting out 42amps this IS charging the battery but after a day of sitting it has to have a jump to get going after that it will start right up. until i let it sit for more than 12 hours or so

any ideas

 

Disconnect the negative battery cable @ the battery,
connect a DC Voltmeter between the negative post of the battery
and the disconnected cable.
If it shows 12 V then there is a load which causes the battery drain.
remove one fuse at a time and see which circuit is draining the battery!
When the Voltmeter shows Zero Volts, you have identified the drain, repair as needed !

 

but isnt there the radio that always has a load caus of the clock
and the ecm memory?

 

it was the battery!!

 

I suggest check the battery again.Based on what you said,i think the battery has something to do with this issue.

 

My Bro in law was original owner & he could not figure it out.

On My 93 ROD, same problem, changed out the ALT problem gone & Battery is good

Regards,

ROADMONARCH