My jeep won't start
Haven't given anyone much to go on here. You have to start with some good old fashioned troubleshooting. Is the engine turning over (cranking)? If Yes, the battery and starter are good. Does it have spark? Pull a plug wire and test. If not, you have an ignition system problem. Does it have fuel? Starting fluid is the easiest way to check (remove air filter and spray a bit in to see if it starts). Does it have timing or compression?
I placed in a new battery and battery cables. I've had the starter tested and it works fine. When I turn the key, I can hear fuel being injected into the engine. It just won't turn over.