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First thing to do when having electrical issues is to clean and tighten grounds, battery cables and clamps.

Engine to body should be a ground at back of engine to firewall.

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Your blower and windows could be a fusible link, they are located on top of the left fenderwell.
 

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Mine literally did this a few days ago. Used a power probe and sent power to the power side of the circuit breaker slot on the fuse block. Was able to roll my window up and blower had power. Replaced the 30 amp circuit breaker with no luck. The lights went off for a bit but are back on. Still no windows and no blower on the ac/heat. Need to find time to trouble shoot some more.
The orange fusible link is the feed for the power windows and heater.
 
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Some will use a inline fuse in place of the fusible link when it burn. Sounds like a bad connection somewhere.

If it happens again you'll know where to look.
 
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