Hello,
After reading multiple discussions on retrofitting a BMW E21 wiper motor to an Alfa 1750 (Australian delivered 1969), I cannot get it to self park. The BMW wiper motor has red, green, blue and white wires and the Alfa wiring inside the car blue, blue/black and white/black before it connects to a plug which then changes to green, white & red.
I have earthed the body of the BMW wiper motor to the body of the car, connected the blue Alfa wire (inside the car) to the green BMW motor wire which is working on lhigh speed via my high speed toggle switch (which is correct) and connected the white/black Alfa wire (inside the car) to the red BMW motor wire which is working on low speed via my toggle switch on low speed (which is correct). The only outstanding issue is that I have a wire from my fuse box which has permanent power on it which is not connected to anything (blue/black wire). Apparently on the Alfa motors, this was used to self park the wiper motor, however I cannot seem to get this to work on the BMW motor. I therfore have nothing connected to the blue and white wires on the BMW wiper motor.
However, if I connect the blue/black wire inside the Alfa to the blue wire on the BMW motor - nothing happens. When I connect it to the white wire, it blows a fuse. Any ideas? I am having trouble uploading the original BMW wiring diagram to this message however if you send me a private response, i can email it to you. All I know is that on 'windshield wiper motor schematic' 53a is blue (permanent run from fuse), 31b is white (park), 53 is green (slow) and 53b is red (fast).
Help as this is driving me crazy & consuming way too much of my restoration time !!!
AC
After reading multiple discussions on retrofitting a BMW E21 wiper motor to an Alfa 1750 (Australian delivered 1969), I cannot get it to self park. The BMW wiper motor has red, green, blue and white wires and the Alfa wiring inside the car blue, blue/black and white/black before it connects to a plug which then changes to green, white & red.
I have earthed the body of the BMW wiper motor to the body of the car, connected the blue Alfa wire (inside the car) to the green BMW motor wire which is working on lhigh speed via my high speed toggle switch (which is correct) and connected the white/black Alfa wire (inside the car) to the red BMW motor wire which is working on low speed via my toggle switch on low speed (which is correct). The only outstanding issue is that I have a wire from my fuse box which has permanent power on it which is not connected to anything (blue/black wire). Apparently on the Alfa motors, this was used to self park the wiper motor, however I cannot seem to get this to work on the BMW motor. I therfore have nothing connected to the blue and white wires on the BMW wiper motor.
However, if I connect the blue/black wire inside the Alfa to the blue wire on the BMW motor - nothing happens. When I connect it to the white wire, it blows a fuse. Any ideas? I am having trouble uploading the original BMW wiring diagram to this message however if you send me a private response, i can email it to you. All I know is that on 'windshield wiper motor schematic' 53a is blue (permanent run from fuse), 31b is white (park), 53 is green (slow) and 53b is red (fast).
Help as this is driving me crazy & consuming way too much of my restoration time !!!
AC