So my battery dies I get a boost and starts right up... Let it run for a bit turn off and it turn on right away but if I let it sit there for a couple hours its dead... Could this be the battery or alternator... And I don't think I'm leaving any lights on or anything else?? Any clues or tips?
Yeah I read that taking off the negative cable can cause a shortage and damage the computer components. I've clean the battery cables a few months back I rechecked them they are fine. Guess I'll go and get the battery tested
NEVER take off a battery cable with the engine running. you'll fry the PCM. if it starts after you get a boost, and starts again shortly after you turn it off, your alternator is working fine. its the battery
Reliability is relative
I unplugged my battery when I got home after work in the afternoon and I disconnected the cable wires from the battery and this morning I connected them back and it was dead.... Thanks for the tip guys
voltmeter should read 13.3-14.7 at start up, and after its running it should settle to 13.7
if the alternator is dead it would read 12.28+/- and be dropping
2004 Lexus Es330, alive; 1999 Cherokee Sport
1998 Grand Cherokee, sold
1997 Grand Cherokee; Black and Gold, Limited 4.0....RIP 2005
to the good times and the bad, the family we have and lost, little brother 1988-2011
Yes I checked the voltmeter the battery doesn't hold a charge it was a battery from Walmart... The sticker says 1/07 that was 6 years ago.... Wonder if I should go back to Walmart and get another battery from there... However I went to auto zone online and put in my jeep specs and it say my jeeps recommended CCA is 800 but that battery is 650 CCA ?????
Ive had good luck with Batteries from Autozone. I did have one go bad about a year and a half after I bought it, but when I went in (fully expecting to just buy a new one) they replaced it free of charge.
1996 ZJ 4.0 Laredo... you know, the one with the ripped leather seats
I think 6+ years is pretty good in a ZJ. My '97 Orvis ate batteries. I think the heat got to them. The Wal-Mart yellow ones had a 3 year warranty, and they'd never last that long. BUT they never gave me a hassle replacing it.
If the battery was dead then you jumped it to start it will not be anywhere near charged enough by the alternator to start again later. If your battery dies you need to put it on a trickle charger over night. You could drive it around all day and the alternator will not come close to fully charging a battery.