Jeep battery or alternator dead?

[Graves]

Should be able to get a full ESC (electrical test) for a small(ish) or perhaps free at a local shop. What kind of tester are you using to check the battery? Deep cycling the battery is no bueno.

[SideShow Bob]

Here's a quick couple of tests to check the alenator, while running, see if a wrech will stick to the back of the altenator. If not weak altenator. Then Start the jeep, pull the positive battery cable, then start turning on the electrical items..... Headlights, radio etc.... Until everything is on or the jeep dies. If the jeep dies, bad alternator.