More wiper motor stuff

[RoyBatty]

Hi all,
The 71 Sport Coupe I acquired from Mark had a broken nylon gear in the wiper motor.
I bought the 2 speed wiper motor from Auto Ricambi and had to do a little fabricating for it to fit in the wiper rack for the coupe. I had to slot the original mounting holes to allow the smaller bolt circle on the new motor to bolt up. I also had to do a little clearance grinding to allow the rack mount to clear the motor body.
I also had to make an actuator arm that bolts to the motor shaft as the stock unit would not work. I used some 1/8 flat mild steel for this. I welded a doubler on the end that the shaft goes thru to allow more surface area for the splines to drive. I was able to drive the stock connector pin from the stock arm, and then stake it into the hole in the driven end of the arm.
I now have working wipers except the park feature is not functional and the intermittent operation feature is not working properly. The wipers stop in whatever position they were in when I move the switch to the off position, and the intermittent feature does only a partial sweep of the screen before it pauses. The motor only makes a little less than 1/2 a revolution before it dwells and then goes on to another half revolution. This makes the stopping position totally random during intermittent operation.
The connector on the new motor matches the stock unit with the exception of one extra wire. Even to color codes almost kinda sorta match.
Is this a fix I can do with a little wiring swaparoo?

[spider2081]

I can't say for sure for a coupe. For the spider the intermittent (delay) works through the park switch contacts. The Delay timer is a specific time timer. Say once every 10 seconds, it produces a short duration 12 volt pulse. This pulse moves the wipers off the park position and they complete through the park switch a sweep back to park and wait for the next timer pulse. How fast the wipers sweep is determined by what speed you have selector set to. To the best of my knowledge the delay timer has only one time between pulses regardless of the speed you have selected for the wipers.
You might have to open the cover on the new motor and see what color wire feeds power to the park switch. For my 81 spider it is Blue/black. The gray/black drives the motor to park. The blue/white is power from the delay timer to kick the motor off the park position.
I think your park switch wiring may be the issue. You can probably correct it at the connector once you see how the switch itself is connected.

Hope this helps

[RoyBatty]

thanks 2081,
it's a start
just got done installing a pertronix module to the same car. so now back to the wipers

[wizard124]

Tom,
look here: http://www.fiatspider.com/f08/viewtopic.php?f=6&t=21722

My '80 has 3 2-prong connectors. Not the single 6 connector you show above. I describe the function of each wire relative to the column lever position and speed dial. The post may lead you in the right direction.

Warren

[RoyBatty]

reading now.
thanks.

[brackie1]

Is there a way to bench test the wiper motor?

[spider2081]

The wiper motor can be bench tested to see that it operates. How ever I do not know of any specifications available to tell how well the motor is operating. Example: applying power and ground to the motor on a bench could make the motor run but that does not tell if the motor has the power or force to operate under the load of moving the wiper blades.
The motors are a ceramic permanent magnet motor. I believe the magnet can loose some of its strength over time and cause the motor to loose power or driving force. This would be shown by the wipers not moving on a dry windshield as in the park mode.

[wizard124]

My motor was.not working when I purchased the car. Very easy to pull it apart to clean and lube. Mine now works great!

[brackie1]

Nice car Warren

Gene

[brackie1]

It's really strange. Mine is a daily driver. It sat for 2 was while I was rebuilding the dash. After installing the new dash. The wipers would not work. Did not do anything to the controls. Just don't undrest and it.

[Redline]

Same for me. They worked fine last autumn. I parked it for the winter, and then the first time I used the wipers, it blew the fuse. I've been through various diagnostic steps and attempted fixes and still have no wipers, 4 months later.

It's also a BC Coupe, so I can sympathise with the hassle of a non-standard motor and wiring connection, as it was specific to the Coupe. Grrr...

I have now ordered wire, proper crimped tabs, connectors, relays etc. and will provisionally re-wire the motor to give me basic two-speed operation without taking all the current through the ignition switch. The motor itself seems ok (in terms of the gears being clean and well lubed). I still need to take it into work one day and run it from a lab power supply to see how much current it pulls.

[spider2081]

I have a few wiper motors that I have applied power to and know they run. On the plastic covers there is a part number that begins with the letter "T"

TGE567C is a large motor with the greater mounting spacing and a 6 pin connector and 6 wires in the connector.

TGE568 is a smaller motor with the closer mounting spacing and a 6 pin connector with 5 wires in it.

TGE576 is a smaller motor with with the closer mounting spacing and 3 two pin connectors.

The motor case is ground as is the black wire on each. Also the gray wire and the blue wire are the motor speed wires.

If anyone needs more info I could test the specific part number motor for you.

I believe there is another part number small motor with a 6 pin connector that is wired different than the one I have.