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Easy one first - there is no measurable voltage drop across a fuse, unless somethng is wrong with the fuse. Not worth considering.
Antenna ground. The ground wire on all my 240's is attached to a body seam flange nearby with a short sheet metal screw. It does not grond via the metal mount piece.
Third. The antenna motor is shut off when there is too much resistance in moving the antenna, whether going up or down. There is a device that measures this, and I don't know how it works, maybe with a sudden spike in current draw.
So, going down it meets with too much resistance too early. Something similar with the going up problem.
The mast and nylon gear can be removed, but I don't recommend that. It's a very PITA job to get it back, if possible at all. I did it but I had to disassemble the entire power unit to do it and it took three hands to wind up the spring, hold the nylon gear in place, and close up the housing. A new one is really easy.
I would suspect that the grease inside the area where the nylon gear gets would up inside has gotten hardened with age, thus creating resistance to motion.
Good Luck,
Bob
:>)
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