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If as you claim that hop only occurs with the A/C on which means the compressor engaged then it sounds like a bad compressor. I had a "similar" situation with my 72 Caddy back in 1993 when the rubber clutch on the compressor disintegrated. Bits of it fell out and caused the thing to go out of balance. When the A/C was engaged it seemed like I was firing a heavy machine gun. The whole car would literally jump up and down with the rate of rotation of the out of balance clutch assembly. Quite amazing that such a tank would be thrown out of whack by such a small piece of rubber but it happened. Not saying that this id definately what's happening in your case but it's worth checking out. Definately have someone look at the compressor etc with the engine running and the A/C both on and off. The situation with the fuses may be a different issue. Quite possible to have more than one issue at the same time with older cars.
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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