Bench Testing Wiper Motor

[Zrush]

Thanks Enrique, that is some of the most useful info I've ever gleaned here yet. Can I get to this cap without taking the motor out of the car?

Thanks,

Chris

Ditto! Thanks much Enrique

Vicky

[Bambikiller240]

.....If your wipers ALWAYS shut off at whatever point you turned the switch off, it is more than likely a fault in those two wires. If on the other hand, it's only at ~certain~ positions that the wipers do NOT return to park, it's probably dirt / gunk inside this switch cap.

Enrique

Or it could be that the motor has not yet rotated far enough to "activate" whatever internal mechanism causes the motor to continue to run until the wipers reach the "park" location once the switch has been turned off.

Chris: The condition you describe has always been observed in the 240Z's that I've owned, even the one that was less than 2 years old when I bought it. As for accessing the cap that Enrique mentioned, you'd need to remove the black plastic "bag" that encases the motor to get to this cap.

(BTW, good info about the adjustability of the park location, Enrique)

[EScanlon]

Or it could be that the motor has not yet rotated far enough to "activate" whatever internal mechanism causes the motor to continue to run until the wipers reach the "park" location once the switch has been turned off.

Chris: The condition you describe has always been observed in the 240Z's that I've owned, even the one that was less than 2 years old when I bought it. As for accessing the cap that Enrique mentioned, you'd need to remove the black plastic "bag" that encases the motor to get to this cap.

(BTW, good info about the adjustability of the park location, Enrique)

I'd forgotten about the black bag and the hated "must move so many inches" before it will cycle through to park. Good catch Carl.

Thanks!

Enrique

[TomoHawk]

The real problem is that the previous owner stripped the plug off of both the motor and the wiring harness. I think but I'm not sure there is a problem with the wiring harness to the wiper motor

The first thing that I think of is that the PO wanted to make the wipers go faster, so he hard-wired the motor, eliminating the voltage loss through the connector.

[abas]

The real problem is that the previous owner stripped the plug off of both the motor and the wiring harness.

Perhaps the PO tried to retrofit a later wiper motor into your car with different connectors and wiring. I know the connectors changed significantly between the 240z and 260z.

Andrew

[ChrisA]

Thanks Enrique and Carl,

I had forgotten about the bag. When I stripped my 71 down years ago I was shocked when I found the motor in the bag. I wonder how "weatherproof" it really is.

Chris

[wal280z]

ok, found it.... couldn't upload due to it's size, apparently.

as always, right-click, 'save target as'

240Z Wiring Diagrams.zip

Wayne

[Bambikiller240]

The wiper motor has a small "cap" on the backside of the transmission housing, to which a pair of wires are attached. That cap is held on to the transmission with 3 screws if I recall right. Loosening those screws (NOT removing) allows you to rotate that cap. By rotating that cap, you'll allow the motor to continue receiving juice, even though the switch has been turned off, UNTIL it reaches the "Park" position. Once the wipers have reached the park position, the contact inside that cap will cut off the power to the motor.

Here is a picture showing the adjustment "cap" that Enrique is referring to.

[Bambikiller240]

Thanks Enrique and Carl,

I had forgotten about the bag. When I stripped my 71 down years ago I was shocked when I found the motor in the bag. I wonder how "weatherproof" it really is.

Chris

The open end of the bag is folded over and held closed only by nylon rivets, so I don't think it could be considered "weatherproof", but judging by the cleanliness of my Wiper Motor. the bag does do a good job of keeping dirt and leaves away from the motor.