I have a '91 isuzu trooper 2.8 V6 automatic 4x4. will not turn over, battery tested with load and was good, starter tested and was good. When I try to start it, the starter relay clicks but doesnt turn the starter. the lights stay bright so no voltage lose from battery. i even unbolted the starter (to see if it was bound up)and tried starting it and nothing. The trooper acually cranked and would idle for bout 5 sec. couple weeks ago but i accidently left the key on one day and it drained the battery and now it wont cranked im stumped. Please help.