Sometimes my jeep will start right up and sometimes it won't start like it's dead but i know my battery is good n charged. It is strange because if I jump start it it starts right up. It is is not my altenator I tested it with the poss. cable off the battery. Then my alarm system dash lights and head lights starts tweeking when I try starting it up. My starter and celinoid look good, I am wondering if it is my poss cable wire from the battery to the celinoid? Any sugestions? also this wierd stuff started happening after my boyfriend gave some guy a jump, or is that just coinsidense?