to 2-Speed Wipers After
seeing discussions on several internet BBS's about upgrading older MGBs with single speed windshield
wipers to the later two speed ones, I decided to tackle this project. I had
previously been made aware of instructions on how to do this, but after
checking them out could see that the wipers wouldn't park when the switch they
used was turned off. So, I did quite a bit of research, circuit testing, wire
tracing, and consulting and have came up with an instruction package for you.
After seeing discussions on several internet BBS's about upgrading older MGBs with single speed windshield wipers to the later two speed ones, I decided to tackle this project. I had previously been made aware of instructions on how to do this, but after checking them out could see that the wipers wouldn't park when the switch they used was turned off. So, I did quite a bit of research, circuit testing, wire tracing, and consulting and have came up with an instruction package for you.
If you don't have a fog light switch you may want to consider mounting your old wiper switch in that hole just to get a balance of toggle, knob, toggle across the dash. That would make the knob fit in quite nicely; or, you may be able to find a smaller knob that will fit the switch. This switch will most likely have to be special ordered so make sure you can get it before doing anything else on this project.
Cole Hersee is the industry leader in big truck switches and other electrical items, and their products are available only from heavy truck dealers and parts suppliers; they do not sell direct to consumers. Check your yellow pages for heavy truck dealers and parts suppliers. A source for a similar switch, but it has a "push the button to wash" feature, is Jeg's High Performance Parts. See the actual switch at this link:
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=36751&prmenbr=361 This switch is actually obtained from Painless Wiring #80713 http://www.painlesswiring.com, and they get it from Cole Hersee. The Cole Hersee switch #75212-04 does not have the push to wash feature nor that icon on the knob.
The last thing you'll need is wiring between the switch and the motor. I started out with a couple of ideas about how to accomplish this and didn't like either of them. First, auto salvagers don't like to cut up harnesses, and even if one did you'd still have a lot of work to do. By the time you buy all the fittings and rolls of colored wire you'd need you would be out at least $30.00 and still have to figure everything out and wire it up; not good.
So I made an arrangement with British Wiring http://www.britishwiring.com phone 708-481-9050 to make up a harness for this job. Contact them, ( I dealt with Ed) and ask for "Small Wiring Harness #423". They said it costs $23.00, that's a lot less than you can make one that's not proper in the end. This #423 harness has the plug for the wiper motor and 4' of the proper color coded wires with shielded female spade connectors for attaching to the switch. There is also a short black ground wire with an eyelet on it.
NOTE: Always disconnect the battery before doing any electrical work on a car.
NOTE: On some models the solid green wire may be a green/pink one. That's OK, they both do the same thing and changes nothing about the operation of the wipers.
While the motor is out of the way you'll need to remove the windshield wiper arms, pull out the drive cable and remove the ferrule and install the proper ferrule, (21) above, and slide the cable back in. You may want to lightly lube it with light grease like maybe Lubriplate 105 if you have it. Heavy greasing of this cable could cause the wipers to run more slowly in cold weather when the grease stiffens up.
When everything is installed, (except the wiper arms), re-connect the battery, cycle the motor a couple of times, turn the switch off, and reinstall the wiper arms. That's it, we're finished.