battery connected backwards

[Charles Loesch]

My wife connected her new battery backwards and now won't run more than 15 minutes at idle before shutting down and needing jumped. Battery was checked and is ok. Please help!

 

[Billwill]

What Year/Model is this Jeep?

Does it only idle for 15 minutes or can you drive it for 15 minutes?

Any warning lights showing on the cluster?

 

[LibertyTC]

Welcome Charles to the forum. Sorry to hear about the reverse polarity situation.
Bill is our electrical specialist, & will certainly be able to help you.