My 1998 outback 2.5 starter will not turn over with the key. I replaced the knock and cam sensors to no real avail. I tested the voltage on the ground at the battery, starter and body ground near battery all checked 12.5 volts. I removed the ground at the block and cleaned the connection and the mounting bolt. Now has gone from not starting when warm, which was the original problem to not startig at all, will only click one time. THe starter is a new not rebuilt, from Adavnce; the battery is new also. Have a new ground cable that could be installed, just not sure will solve problem. Starter will work and start the car if by pass ground and go straight from hot side of battery to starter. Any suggestions short of installing a momentray switch?