Join Date: Sep 2000
Location: Washington, Michigan USA
The '69 wiper circuit is grounded at the wiper switch through a stamped sheet metal ground strap that's shared with the light switch - the bottom leg of it attaches to the lower metal instrument panel reinforcement, same screw that has the black instrument cluster ground wire under it. Make sure the strap is there, sandwiched under the wiper switch, and it's properly attached at the bottom.
'69 Z28 Fathom Green