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Unread 02-28-2013, 01:46 PM   #1
Cxrob
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Battery? or something more on a WJ

Son went to start his 02 WJ today and each time he gets a slow crank with dim lights and it then starts. Sound to me to be the battery (Last week we changed the fan relay switch - which was leaving the fan running and draining the battery)... it was starting fine for the last 5 days until now.

Can someone tell me what voltages I should be reading at the battery off and running?

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Unread 02-28-2013, 01:51 PM   #2
Red350ss
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Quote:
Originally Posted by Cxrob View Post
Son went to start his 02 WJ today and each time he gets a slow crank with dim lights and it then starts. Sound to me to be the battery (Last week we changed the fan relay switch - which was leaving the fan running and draining the battery)... it was starting fine for the last 5 days until now.

Can someone tell me what voltages I should be reading at the battery off and running?
Battery off should be between 12.0 and 12.8 volts, running should be in the mid 13 to 14ish volt range.
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Unread 02-28-2013, 04:08 PM   #3
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Can someone tell me what size battery an 02" WJ with 4.0 should take?
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Unread 02-28-2013, 04:33 PM   #4
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Can someone tell me what size battery an 02" WJ with 4.0 should take?
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Unread 02-28-2013, 05:13 PM   #5
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around 700 CCA - im basing this on my 4.7 taking 850
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Unread 02-28-2013, 05:35 PM   #6
bradywgn71
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Quote:
Originally Posted by Cxrob View Post
Can someone tell me what size battery an 02" WJ with 4.0 should take?
Group 65
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Unread 02-28-2013, 05:52 PM   #7
gcjeeping
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Quote:
Originally Posted by Cxrob View Post
Can someone tell me what size battery an 02" WJ with 4.0 should take?
Biggest one(s) you can fit...lol

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Unread 02-28-2013, 06:06 PM   #8
Cxrob
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SO.. my son jsut got home and here's the sympton

turn key on dash and headlights are fine... go to start and the lights dim and after a slow crank she starts.

Sounds like a weak battery to me - no?

the battery died a few times last week (fan relay switch keep fan running so we repalced it)

from the feedback looks like its a group 65 - I see Sears has a 650 and 850 CCA... guess there's no harm going wiht the 850.
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Unread 02-28-2013, 06:16 PM   #9
gcjeeping
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Make sure your battery connections are clean.

Have the battery tested. I have always checked bad batt cables by bypassing them with a good set of jumper cables one at a time. Sometimes a batt cable will corrode from the inside especially the ground. A bad cable will allow enough amps for lights but not crank.

Then it would be alternator to have checked.

Also if you have a known good battery to put in (doesnt matter what size) and try to see if it starts right up. I took my battery out of my Escort and put in my jeep to test one time to see if it was the batt.
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Unread 02-28-2013, 08:03 PM   #10
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x2 on getting it tested. Autozone will do this for free in the car in the parking lot.

Sounds like a bad battery to me. Full cycles (battery dying and then being fully recharged) is terrible for car batteries and can kill them pretty quick.
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Unread 02-28-2013, 08:07 PM   #11
murph0124
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could be bad starter drawing down when it cranks also
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Unread 02-28-2013, 08:47 PM   #12
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could be bad starter drawing down when it cranks also
^ can definitely be a starter as well. I had a starter go out, tested out fine at Autozone, but the old man there told me it didnt sound like it was quite winding up as it should--took a new one off the shelf and tested it and you could clearly hear the difference between the two. Something to consider.
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Unread 03-01-2013, 10:04 AM   #13
Indslpwr04
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Check all your heavy gauge engine ground connections. I had an old bronco that wasted the battery, alt, and starter in a 3 month period because the battery to engine, engine to frame ground cables were severely corroded. Its free too.
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Unread 03-01-2013, 03:44 PM   #14
Cebby
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How old is the battery?
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Unread 03-03-2013, 06:31 PM   #15
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i did a 4.0l engine in a 99 wj and the engine block was painted and the grounds that go by the cam sensor area werent making good contact do to the paint. Maybe the grounds there are making poor contact with the block?
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