1975 wipermotor

[Tim666]

I am wondering if someone could ihelp me, the previous owners have made a mess of the electrical on this truck. My wiper motor only has one harness going to it, there is spots for three. My wipers won't park so I am assuming one is for the park relay. There is now an in tank washer pump which I assume is one of the empty ones, I would just like it to park on it's own if it just a wiring issue.

[donut]

Hopefully someone will chime in and say it's a wiring problem.
Unfortunately, for my '73, the docking seemed to be in the wiper motor itself. I never did fix it.
One of the bolts holding the wiper motor to the firewall is also the ground, you could try cleaning that up, and cross your fingers.

[ray_mcavoy]

Hi Tim,

What you have there appears to be the newer 1978 + style motor.

The original 73 - 77 wiper motors have a larger round motor housing and the park switch on them is wired internally.

With the 78+ motor there are 3 connectors as you've noticed. The 3-terminal plug at the bottom (that is wired up on yours) has the +12V power wire and two other wires that get grounded for the high and low speeds.

The 2-terminal plug with the wide flat blades sticking out on the front is for the washer pump solenoid. And the other smaller 2-terminal plug closest to the top is for the park switch.

Check the 78 or newer service manuals and wiring diagrams that hatzie posted at http://67-72chevytrucks.com/vboard/s...d.php?t=545416 ... they should have the wiring diagrams that show how the park switch gets wired into the circuit.

[MusicMan70]

Here's what my 73 has

[Tim666]

Thank you guys, I do have a Haynes manual with the wiring diagram but it isn't as nice as pictures, thank you.