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Zs-ondabrain

Honda Wiper Motor Upgrade for the 240Z

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There's nothing like getting empirical data to figure out what's going on. I took current, voltage & resistance measurements to figure out what I didn't have right.

Blue/red should go to green/black. That is the 12VDC for the motor.

The blue & blue/yellow from the Z should be connected as I suggested.

Try the blue/white from the Z to the blue/white on the motor for the parking function. If that doesn't work, try the yellow on the Z to the blue/white on the motor. (The last is a guess. I traced the yellow wire to the heater subharness. I wasn't expecting it to go there.)

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website acting wired again, if you get two post, don't think a thing about it. I found that the car to wiper harness plug changes color on one wire, I can't remember which but I did do a diagram of it, right now, its miller time...I do have fast, fast and clean, and park at the moment. I'm only missing low...

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You remember that I did not have a yellow black wire? Well I pulled the original combo switch that I had changed out. It did. I ran a continuity from it to the wiper harness under the hood. It has continuity with the solid blue wire. The harness from the combo switch plugs into a short extension harness that has ALL BLACK wires, the other end plugs into the under dash harness, but guess what, the colors don't line up with the pins. I am going to have to run continuity on all of the wiper switch wires. None of this rig looks to be jacked up, spliced or anything but stock. Bear with me, I'm tired but I think I'm on track. Anybody care to check if they have that little 8 inch extention right after the combo switch, I think you can see the floorboard end without taking off the combo switch cover...

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I finally got everything working. I had to check continuity from the combo switch to the wiper motor harness and re label the wires. the color coding was way wrong at the wiper end. I'm thinking that Datsun had a few old harnesses left over that were a little short, so they put the 8 inch extention in that had all black wires and did not pay attention to the pin coding. Anyway, after I relableled the wires to the correct color and by using Z"sOndebrain's diagram, it worked the first time. High, low, park. By the way, this is worth doing, these wipers kick!

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I failed to mention that I got to looking at the wire size coming out of the Honda motor..It's way bigger than the Datsun wire. I decided to add a "Hot Shot" relay to just use the Datsun wiring to trigger a relay that was wired to a new fuse block that I have under the hood. I used 12 gauge to run the motor from the relay. I am afraid that the Honda motor must pull some serious amps to work as good as it does and that the old Datsun wiper switch and wiring might be getting a little weak after 38 years. I used that technique the first time on the weak starter signal to the solenoid when the thing failed to start, worked there and worked here. Taking the pressure off those old switches is always good.

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Hi all, a couple of months ago I did the upgrade with a '97 Accord motor, using this forum and the following link as a guide:

http://www.atlanticz.ca/zclub/techtips/wipermotor/index.htm

Mostly because it was easier for me to find a motor online for that specific car/year than for the Civic or Acura motors.

I ended up figuring out what the wiring was myself, just based off where the wires were coming out of, and comparing that with where they came out of the motor itself (the colors of the wires didn't match up with any diagrams I could find). It works great, except for the intermittent setting which makes something like half or 3/4 sweeps across the windshield instead of full sweeps. I'm not sure if that's clear, but what's happening is when I set it to intermittent, the wiper goes up and then a little down, then stops right in the middle of the windshield for a second, then it does the next sweep which takes it down and then up where it lands it someplace else randomly on the windshield (not the same place). If I turn it off, it settles back at the bottom where it's supposed to, the same as if it's going constantly and gets turned off. This means that it just looks dumb when I'm using intermittent, but at least I don't have to worry about it parking correctly at the bottom when I turn the wipers off. Does anyone have any idea how I could make the intermittent go all the way instead of most/part of the way? I'm not sure if I wrote that clearly either, so let me know if I need to clarify anything.

Another note: I used shrink wrap to wrap all the wires at their connections, in an attempt to keep them as dry as possible. Thanks for the great guide!

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Rain season is over here in CA, but I'm about to have wiper motor upgrade for my '75 280z.

Following '75, '77, and '78 FSM and this thread, I drew diagram for wiring.

post-25433-14150824461121_thumb.jpg

Edited by tamo3

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skillinp,

You did your post here last January, I also installed a 97 accord wiper motor. The park switch is a rotating switch inside the case on top of the plastic gear (a copper brush and a piece of metal mounted on the gear). The motor turns the gear and switch which makes sure the wipers park at the bottom of the windshield by connecting the park switch across the same place the low speed wires connect. The park switch is open when the wipers are at the bottom of the windshield and closed otherwise. When the intermittent turns on briefly and then off the park switch keeps the motor going until the wipers park. That is why your wiper keeps stopping in various places on the windshield, the intermittent turns the motor on briefly expecting the park switch to continue providing power to park the wipers but the park switch never takes over. The original wiper motor in my car (1970) used a relay for the park function. The relay makes sure the park switch lasts a long time. The wipers on my car with the 97 accord motor do not park but once I connect the park switch it will make intermittent operation (with an intermittent gizmo from an auto parts store) and park possible, something I will add when everything else is done. This is all assuming that when the 97 accord motor was installed I ground the shaft flat sides at the correct angle as the park switch rotation position for park cannot be changed.

Trying to compensate for the switch turning off at the wrong time with an electronic time delay is chancy as that approach assumes the speed of the motor is constant on each wipe but I personally feel the approach might have merit from the standpoint that the wipers would park in approximately the same position each swipe which might be less annoying than the wipers stopping at random points. Anticipating further work on this I connected a 14.7K resistor in series with the wire on the wiper motor that I think is the park switch (blue/white wire-gives an open circuit to ground on park) as I wasn't sure what the other end of this wire connected to and didn't want to blow a fuse. From inside the car a time delay circuit could be rigged to this wire (or a relay with the other end of the coil at 12V) which would connect to the slow wiper wire making a pseudo park workable, I hope. I hope this lengthy diatribe helps a teeny bit.

Mike

post-18366-14150824462236_thumb.jpg

Edited by Mikes Z car

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The swap for the 73 240Z, 260Z & 280Z is something I'm going to be looking at in the future. I am interested in getting better integration with the intermittent function. At least I can test my theories out on the 240Z & 260Z.

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Hey all. This has been an exelent source of information for me so I thought I would share. I had a wiper motor failure and replaced it with a Cardone assembly. In the process of exchange I stumbled on a way of wiring this into my 72 without a relay and still maintains the park feature.

5 prong Acura harness orientation: Looking at the plug

-5--4-

-3- -2--1-

2007 ACURA Integra DATSUN

1: Low speed - Blue/ White

2: High speed - Blue

3: Ground - Black.

4: 12v constant - Blue/ Red

5: Intermittent - Jumper to #1 for Park signal

Blue/Yellow is omitted from Datsun harness and not used.

Blue wire on wiper motor needs to be cut and isolated on the switch side.

Just needed to notch the shaft a little and it works flawless. Cost $72.00 Canadian taxed and delivered from E-Bay and there is very little wiring to do and no relay.

Manufacturer Part Number: 76505-SR3-A01, 76505SR3A01

Reference Cardone Part Number: 43-1423

Edited by Jim_Reaper
Forgot some information

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On 3/11/2016 at 3:39 PM, Suleyman Tezgul said:

Where do I put the relay...

That's what I came looking for too, I searched but didn't really find what I was looking for.   Please, someone correct me if I am wrong.   I think you can pretty much mount it anywhere you want.

I'm thinking that I may mount mine to the wiper motor with a hose clamp similar to how the original Z relay is done, inside the bag and out of sight for a more stock look.   I got the 6-pin connector from Vintage Connections and plan to encase the new wire back to the Datsun side in heatshrink.   My grommet is roached so this a good opportunity to replace it too.   I am concerned a little about how hot the motor may get during use and melting the relay though, so I may engineer some kind of insulator/stand-off for it so it's not lying directly on the motor.

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Great article. Thought I would try to fix my original. turns out it was the copper commentator the brushes ride on was corroded. Also the plug...after sitting 32 years in a barn. Found this quick fix on the filthy plug. CLR soak. 20 min. Here is a before and after.

12773.jpeg

12777.jpeg

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If you can't get to a bone yard or pick a part...I found an awesome fix for slow early z wipper motors. First I cleaned inside the motor. Commentator and brushes. New grease where needed. And then bi-passed the LR power lead to motor with direct 12v from battery with 30/40 relay and 30a fuse. Works amazing...even on dry window.

194.jpeg

Edited by REMNANT
Type error

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