Wiper motor wiring

[The Rocknrod]

Originally Posted by MT65

Yes, checked that this morning, never had a wiper switch be the ground in the past, knowing that it was marginal when I drove home in a snow storm through most of eastern Oregon, I just ordered one of Newport Enginnering new ones. Do not want any issues in the future, and one more speed can’t hurt.
I had luckily kept the old harness and panel to check items like this, thanks for the help tho......

On an OEM motor the wiper switch IS the ground. The yellow is power, the motor grounds THRU the switch. - https://67-72chevytrucks.com/vboard/...d.php?t=695112
When the wiper switch is turned on, it completes the circuit to ground (the dash). - http://67-72chevytrucks.com/vboard/s...d.php?t=413551