I am suspecting a faulty wiper interval relay, but not sure how to confirm. I don’t have a spare handy to throw at it.
Symptoms are non-functioning wipers. I have access to the 4-pin plug that goes into the wiper motor, and I have a known good motor loose (meaning I have one in my hand that if I connect direct to battery it operates normally)
With the multi-meter, I get voltage on the slow or fast pin of the connector, appropriate to the position of the stalk switch, and I can hear the relay operating as I move stalk switch from off position to interval or single-wipe.
The voltage is a little low, about 10v +/- 0.5 v at the connector, when measuring it w/o being plugged in to motor. The battery itself is fine, and the car cranks/runs with no issue.
If I plug the connector into the known good motor, with the multi-meter attached to the back side of the pins, with the key on, switch on, i.e. showing voltage, when I plug it in to the motor, the voltage immediately drops to zero, and no action from the motor.
I have also jumpered in a separate ground from body direct to back side of plug on the ground terminal.
Bad relay, or something else to check? I have two stalk switches and both result in same behavior.