2007 Don't start

mike · Friday at 8:24 AM

Howdy All,
2007 Liberty, 72,511 miles. New battery last year (5-31-25). Super Start Extreme from O'Reilly's. Yesterday I had to jump-start it, and same thing this morning. Never had a problem before. The new battery is the same model as the old one, that lasted 5 years. No other changes besides the new battery. I'm at a loss. Any ideas?

lfhoward · Friday at 6:14 PM

Maybe the battery is actually bad. Oreilly’s will probably warranty it for you if it is bad. See if you can charge it up on the bench.

Your Jeep may instead have a parasitic draw somewhere. If you have a multimeter you may be able to figure out where.

Does your alternator charge the battery at 14 volts after you jump start the Jeep?

mike · 2026-07-25T07:39:19-0400

It's weird. When I go out in the morning it starts fine. I leave it running for several minutes. About an hour later is when it needs a jump. We jump it with a NOCO Boost Plus GB40. I've put a NOCO Genius 5 on it, the charger light goes to green, turn the key with the charger still hooked up, it needs a jump. The wife then drives it a couiple miles, parks for about a half hour, and has to jump it to drive home. I do have a multimeter (Fluke 77) but I haven't checked anything yet. I used the multimeter to check things out a few weeks ago and everything checked okay. I couldn't do the check where you leave the meter hooked up and crank it, because the Jeep would start every time I turned the key to crank! It's got me scratching my head, for sure.

24turbo · 2026-07-25T22:16:28-0400

My wives Toyota has done something similar 2x now about 5 years apart. Changing the battery cured it both times.

I just remembered I had to change the alternator about a month after. It was literally smoking it would get so hot. I wondered if it was overcharging and cooked the battery

2007 Don't start

mike

"07 Liberty

lfhoward

Wheel. Repair. Repeat.

mike

"07 Liberty

24turbo

Full Access Member

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