Tired of the old SLOW and Tired wipers on your 240Z? Ya, Me too. SO I did some research on the subject over at HybridZ and found that for a few years now, people have been trying to use the 94' Accord and 91' Civic wiper motors as a replacement to the Datsun wiper motor that ONLY like to move if the window is WET...
So I read every thread and post on the subject to find out as much as possible. All I found was pictures and posts by people saying that "it works great BUT..... The wiper does'nt PARK when you turn the switch to OFF. You have to shut the wiper switch off at the EXACT moment to get the blades to sit in the usual DOWN position.
So I went to the junk yard and pulled a 91' Honda Civic wiper motor, brought it home and tore the gear/contact cover off to find what made it click and Also to find why nobody, after 4 years, could get the wiper to "PARK" I wrote everything down that I saw, put it back together and studied the their wiring diagrams and my diagrams.
So I wire up the wiper the way everyone else had been doing it for a few years and started tesing each and every wire. I discovered what they had missed and decided to wire up a relay, the way I thought it should be, to get the wipers to "PARK" and then gave it some power. Slow speed worked great, high speed worked even better. So I kicked it back down to slow then crossed my fingers and turn the switch off. It spun a little before the relay kicked in, then it finished it's rotation and stopped exactly where it should have.
So I did it a bunch of times and it stopped in the exact same spot every time. So in other words, I seem to have fixed the problem that plagued people who have done the conversion before.
Below is everything you'll need to know about putting in a 91' Honda Civic wiper motor into your 240Z. I've done the conversion and it's FRICKEN AWESOME!!! The first time I tried the wipers was in my garage on a DRY window with NEW wiper blades. I made a video of it for any unbelievers and also to show how the OFF position Parks the blades at the end of the rotation.
So here's some more good news, the Datsun wiper motor mounting screws work on the Honda motor AND the Datsun wiper arm bracket will slide right onto the Honda motor shaft without modification. When you go to the Pull-A-Part, SAVE THE BOLTS and the NUT & WASHER. If you buy the motor at the Auto Parts Store, it will NOT normally come with bolts or the bracket mounting nut.
Here is the Short list of needed items.......
1) 91' Honda wiper motor (make sure to unplug the motor and also remove the female end from the honda with at least 6 to 8 inches of wire past the female plug, you'll need the female end if you wanna make a custom adaptor type harness) I paid $6.50 at the local Pull-A-Part, Schucks Auto Supply wanted about $100. Go Used.
1) 20/30 amp 12 volt relay from the auto parts store (usually about $5.00)
1) 6-terminal Datsun Plug (exactly like the one on your Datsun wiper motor, or Voltage regulator or pre 3/73' Combo switch on the harness side. I sell these and the terminals if you would like to make a brand new adaptor for your conversion
The other possibility is to Cut off your plug and wires from your Datsun Wiper motor, it's up to you. You can even Hard wire the Honda motor in if you'd like.
70' Datsun 240Z __________________ 91' Honda civic wiper motor
blue/white-------pin 86 ________ Pin 87A-------blue/white
blue-------------pin 87 ________ pin 30--------blue
Blue/red-----------pin 85-------pin 85----------green/black
Here are the pics for drilling the Datsun wiper Plate, notching the plate to seat the Honda motor correctly, and that's it. 5 small cuts, 3 small holes.
If you have any questions and don't mind reading alot more, check out this link for every single detail. http://forums.hybridz.org/showthread.php?t=82292
After the New Honda Motor is installed in your Z, turn the wipers on once or twice to 1) Make sure the motor is working correctly and running and 2) to Park the wiper studs in the right position before installing the wiper blades.
Feel free to ask questions here, post results, share added info (other years and models of Honda wiper motors that are identical etc.)