I would be happy for someone to prove me wrong, but the wiring diagram for my PA28-151 clearly shows that there is no main breaker for the alternator output. It is strange. The wiring diagram is on page 2H24 of the PA28 151/161 maintenance manual.
John

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Since all the obvious and well-known sources have been checked, I suggest you use a hoist to lift the nose gear off the ground and start pushing, pulling and tugging on the nose gear tire/wheel assembly in an attempt to find out what is loose. For instance, the two bushings in the engine mount/nose gear support weldment that the nose gear trunnion pivots on could be extremely worn, which would allow the nose gear trunnion to move in the bushings. Or the welded engine mount might be slightly bent.
There has to be a cause and after checking the obvious, it's time to move on to less likely suspects.
Please let me know when you discover the cause of the shimmy.

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Thanks for the response and the great info, Steve! Much appreciated!
Greg

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