At idle you should have 15-20 in.Hg. Under heavy loads/acceleration, vacuum can drop to 0. Under decelleration it can be as high as 25-27 in.Hg. Sounds like your wiper motor gave up the ghost.
49 Chevy 3600
65 Chevy K10
48 International KB-1 Service Truck
55 Willys CJ5 - Chevy 331 powered
26 Model T Roadster Rat Rod
70 Tucker Sno-Cat 442-A
96 Dodge 3500 Cummins dually flatbed x-cab 4x4
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If you can't fix it with a hammer, it's an electrical problem
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