Conner;

If all you did was replace ground-strap between Frame and Engine, and that restores Wiper function, your statement suggests it was not intact and that was the reason Wipers were not working...I have trouble understanding (or believing that) because an open Ground-Strap would most surely result in other symptoms...none the least of which would be related to Starting and Charging, because what path would these currents be taking??

The "Ground Strap" Eric was speaking of in his post jumps across the Wiper Motor soft (and non-conductive) rubber mounts. This GS being loose or out of place will result in Wiper issues only.

Cheers