I agree, Hammer has some great info, but here is what I think I know. A body lift should not cause a draw, it could cause certain electrically issues due to bad ground, I guess it is theoritically possible that a relay is staying open due to a bad groud, but that's far fetched. I agree the ground should go to the block and then healthy ground straps should ground the engine to the chassis and the body to the chassis.
When tracing a draw, I will remove the ground and put a test light in between the terminal of the cable and the lug on the battery, if there is a draw it will light up brightly, the harder the draw the brighter. It is not uncommon to have a very dim light due to stereo and memory and things of that nature. At this point I begin removing fuses until I locate the circuit that it is on and then trace it from there until I find the culprit. If the draw is not associated with a fuse then you have to start unplugging items that are not fused, maybe horn or headlights or things of that nature, you just to look around for items not listed on the fuse block. Aftermarket equipment is always suspect first (such as stereos), then the factory equipment.
Electrical gremlins can be a bear, but the good news is that it is constant, not to mention there is only about 5 wires in a Jeep (exageration but still not a lot). I am not overly familiar with a Jeep electrical system and their issues, but in general fan relays and open voltage regulator among others are common issues with older stuff.
Hope this helps good luck.
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