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MidnightYJ90 02-27-2008 03:56 PM

grrr starting trouble
I guess to ask what i need to i have to start from the beginning. over the hunting season the jeep had some alternator->battery issues, both were changed ( Optima Yellow) and it was found that there was a short inbetween so a jumper was used and everything was great untill yesterday. now the dang thing is starting very weak but once it goes the gauge jumps to 14 and when i turn it off and back on its fine...but if it sits for a day its weak again. any ideas?

02Prove 02-27-2008 05:00 PM

Perhaps the alternator you replaced was bad also?

4.0l sahara 02-27-2008 05:08 PM

Get out the multi meter and do some testing. Don't just be a parts changer.

With jeep off battery should be around 12.6v

with jeep on around 14v on meter

Do a resistence check on the battery cables
Check for a big voltage drop from battery to starter.

have the alternator output checked

Do a load test on the battery. cheap way to do it is to hook up a meter disable the ignition and crank for 15 sec the voltage should stay above 9.5v

Is the top of your battery dirty? That can cause a drain. voltage will seep across the top.

Do you have a electrical drain or short?:D

MidnightYJ90 02-27-2008 05:15 PM

i disconnected the positive lead and the alternator is keepin the engine running, ill go clean the top and the posts and maybe that'll do it

4.0l sahara 02-27-2008 05:27 PM

Also on a modern car thats not the best thing to do. It can cause a voltage spike and kill the computer and other things.:D

MidnightYJ90 02-27-2008 05:29 PM

battery is reading 12.14, not much computer in this thing alot of shyt is disconnected haha

MidnightYJ90 02-27-2008 10:00 PM

cleaned the terminals and tightened the cables still nothinggg

MidnightYJ90 03-19-2008 10:37 PM

it was the starter, she is running like a dream now!

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