Ok i just got a 97 F150 about 3 months ago.. and ive had nothing but trouble since. I went to a mastercare service center to have the oil changed and they failed to put the new oil in.. so i guess you can tell where that went.. they replaced the engine with one that looks like it came from a junk yard and it ran fine for a while. then it started making a little noise.. nothing that sounded too bad though.. so today, i planned to get the oil changed on my lunch break and go out.. and it wont start.. like theres not enough juice to turn the engine over.. it had acted funny the other day so i had it checked out.. the battery is only 3 months old. A local parts store checked the electrical system for me and everything checked out.. yet today.. nada.. the lights all come on and everything appears t be fine.. it just wont turn over.. it clicks like a relay isnt getting enouhg power... any ideas that wont cost me an arm and a leg?