[RDKeysor]

Once again I have been trying to fix a wiper system that has lost the intermittent and low-speed functions.  I have been down this road here before, eventually solving it in a manner that now escapes me.  I am 87. I first lifted the front edge of the plastic panel that covers the heater system, wipers, etc. in the engine bay. My intention was to disassemble the wiper switch connector mounted on the right side (viewed from the front) of this area with the intention of putting a bit of dielectric grease on the connecting points.  There are six of these, and upon disassembly they can splay in various directions.  I clearly did not get them back in the right order.  Upon reconnecting the battery and switch, I operated the wiper motor and got high speed action followed by a blown 30-amp fuse (no. 24).

 

I assumed that if I placed the two sections of this connector in the same relative positions, top up, the six wires would match position.  They not only don't, they are not the same color in the top and lower sections.  Aside from the brown, ground wire, present in the upper left position with the parts vertical, none of the wires are matching colors.  I'll try to illustrate this by showing a text rendition of the wires of the lower connector on the left, the upper section on the right.

 

First we look at the wires on the left side lower half of the connector (goes to motor) and the left side of the upper connector (to wiring harness). For reference, the wires emerge at the BOTTOM of the lower section, from the TOP of the upper section when viewed in that orientation.

 

Left side, top to bottom

Brown/Brown

Blue/Green

Green/Brown and White

 

 

Right side, top to bottom

Red/ White and Black

Blue/Yellow and Black

Green/Black and White

 

If this seems challenging, writing it was no fun either. In any case, the brown ground wires match.  Nothing else. I have 944 shop manuals and 968 parts/wiring discs that don't work in our current computers. Yeah, I wish I hadn't opened this can of worms.

 

 

 

 

 

 

Partial Post: Please Login or Register to read the full post.

[RDKeysor]

Not surprised that no one responded to my slightly incoherent report on the wiring botch I created with the wiring harness-to-wipermotor connector.  Since the wiring connections on the harness side of the connector are fixed in place, the likely swapping of two of the six wires on the motor side of the connector is likely the issue.  If any forum member has access to an uninstalled 968 wiper motor, providing me with the position of the wires by color on that motor will enable me to make sure mine is a match---or not.  Thanks to anyone who can help me.  I would appreciate the answer to be viewed from the top of the connector, with the end where the wires emerge at the top.  

Partial Post: Please Login or Register to read the full post.

[RDKeysor]

This began with my effort to solve a nonfunctioning intermittent and low speed wiper motor.  The two higher speeds continued to function.  I had this issue years ago and somehow solved it.  So, I exposed the wiper motor under the black plastic cover at the back of the engine bay.  My plan was to disassemble the connector between the wiring harness and the motor and apply a bit of dielectric grease to the six pins.  I did this but in the course of reassembling the connector, four of the six poles in the connector were inadvertently displaced.  Upon assembly the motor operated at top speed and died when the 30-amp fuse blew.

 

As I did not get any response to my query about the connector pole wire positions on this forum, I located a photo of the top of the connector on, I think, Google. Using this photo, I determine that four of the six wires had swapped positions, side to side.  I used the photo to reposition the wires, reconnected the battery, replaced the fuse, and found the wipers had been restored to their full function, including the intermittent action.  Why did I apply dielectric grease to the connector poles?  Because upon attempting to use the low speed speed, I sometimes got a very low speed function.  I thought perhaps moisture had gotten into the connector and when conditions were just right the low speed wiper speed was receiving just enough juice to operate.  I theorized that a couple of the connector pins were losing good contact, and this appears to be correct.

 

For the record, this is the correct position of the six wires viewed with the removable top cap removed, looking from the top (the end where the wires emerge going to the motor)  to the bottom.  The left side, top to bottom, brown, black/yellow, white/black.  The right side, top to bottom, black/white, green, brown/white. I will add that I sought this information from various sources for the Porsche 944 and can tell you they are different, including a red wire, in one example I found.  I have now ordered a set of paper wiring schematics for this car.  The computer disc I had used in the past for this information no longer works with our computers.

Partial Post: Please Login or Register to read the full post.