Jeep is dead
Jeep keeps randomly dying. Battery gauge goes up and down then when I turn it off its completely dead. I have a new battery and I tested the battery and alternator and they are both fine. I put a load test on it and it recharged. No idea what's wrong? Bad ground? Wire short?
My .02, Sounds like a corroded connection. Check and clean all your ground connections. 2 on the firewall, 2 on the block. if you haven't already, also check/clean the battery terminals, fuse block terminals, and alternator terminal.
If it is completely dead, the first thing I would do is remove your battery cables, get some sand paper and clean the connection points, then get a package of that battery anti-corrosion grease from a parts store and put it back together. Next, look for a loose / torn ground connection at the back of the block behind the head on the drivers side. If it cranks, but does not start, try fuel / spark troubleshooting. Starting with the key in the "on position", look for 12v+ at fuse #11 and #12 behind the glove box. 11 is for the fuel pump and 12 provides power to the relays under the hood. From there you can start narrowing down fuel vs spark.
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