Re-reading your post I noticed something else .... the fuse for the compressor is an inline fuse holder located with the ice cube relays in the black box on the left fender near the shock tower, I believe.

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78 300d 158k driver
80 300d 200k fixer
80 300d parts car
98 Cherokee 240k

" I know for certain that someday while parking or un-parking my Jeep Cherokee, I'm gonna' either pull the headlight switch right outa' its dashboard OR stomp its hood release lever clean offa' the kick panel. It's just a matter of which will happen first."