Lost All Power / No Cank
 

Hello,

So i woke up this morning wanting to do a Cooling Fan override on my 2000 XJ... Started her up fine this morning, let her warm up. I then drove to AutoZone, purchased what I needed.. When i got back inside the Jeep to start her back up, I normally turn the key over and wait a few second then crank her over.. So when I cranked her over, I noticed she behaved weird such as Like power was about to go out and turn on.. She still fired up, I then went to get some Gasoline I left her running didn't want to turn her off..... I got home, parked her in the Driveway & turned her off.. Went inside the house to get the tools I needed to perform the job...I decided to get back in the Jeep to start her back up, when I turned the key over "Something Went Wrong" all power got Cut off... I had no Crank, No Clicking from the Starter, No headlights, No Interior lights Ect..... I put a Multimeter on the Battery and it reads 12.9, I also checked all of the Fuses and they all are good..... So what else can it be???? I am so frustrated right now guys...... Please help me my fellow Jeepers....

The 1st thing to look at is the battery cables , they need to be clean and tight on both ends of the cable .