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My 92 5sp has some strange starter problem. It first occured last year when I put in a reman '97 outback starter. The starter worked fine for a week and then the key wouldn't start it anymore unless someone was tapping the starter at the same time. So I got another starter and the problem went away. But it recently started acting up again and I replaced the starter for the 3rd time only to find that starter has the same intermitent problem. The wire from the key is putting out 8.5v in the start position always but sometimes the starter doesn't respond at which point I have to get out and jumper a wire from the positive battery terminal to the ignition input on the starter, then the starter jumps to life. Does anyone have an idea as to what the problem may be?

Thanks,
Chris