I’m not sure if your Jeep’s charging circuit is fused other than a fusible link. If the problem is still there after pulling all the fuses then check the alternator. The field coil is energized when it shouldn’t be.
The idiots at the auto parts store won’t likely see that! Check it yourself!
If you can’t figure out how do do it with a meter... at least disconnect the alternator and see if the battery holds it’s charge.
Your battery should never discharge beyond 50%. Each time you allow that to happen, it’s lifespan is reduced dramatically.
Another note about parts store morons. They aren’t mechanics! Just like with fast food places... if you don’t follow the script, they can’t help you!
“I need a tire valve stem cap.”
“OK, what kind of car?”
“It doesn’t matter, there is only one size!”
“What engine do you have?”
“Are you retarded?”
“Is that two or four wheel drive?”
If your conversation was even close to that... your old battery was fine. They can’t test a drained battery! Even if they knew how... it’s their advantage to sell you one anyway! Besides, they don’t care if you waste money or if your car runs or not.[/QUOTE
Should I grab the Optima battery charger, or is that a scam? I haven't charged the new batteries yet so I want to do it without decreasing their lifespan.
While I use Optima batteries in all my Jeeps I haven’t tried the Optima charger myself... yet. I have heard great things about it, like reviving non-Optima batteries but nothing bad.
I have two heavy duty shop starter/chargers and several of the smaller 10 amp kind. So I don’t really need another. However “if” I did, I’d likely invest in the Optima charger as well.
I have quite a few classic cars. Obviously they don’t get driven often. Each is on a trickle charger “Battery Tender”. I’ve had extremely good luck with those. Even the Cheap Harbor Freight ones seem to work OK.
Bottom line... if you need a charger, get it.