Hi Guys
I have the two speed W14 (I think it is) motor, and no wiper switch mechanism, or at least none I can get working. What modern replacement can I use, preferably one that does not need a relay? If there is one that has push for intermittent or activates the motor and the washer pump then that would be even better.
Hopefully then I can change the actual knob for something more period.
Many thanks in advance!
Berni
What switch arrangement do you have now? It doesn’t sound like the usual two switches on the facia.
Quick edit: After a look at the workshop manual I’m guessing that you have the manual system, one knob that actually is the washer pump and the wiper switch. I’ll retreat to the garage now as I’ll be of no help. 
No switch, thats the issue, I just have the wires from the motor.
I have ordered one of these…
https://www.ebay.co.uk/itm/326348105961
Will see how it all works out.
All the best
Berni
"Hi
I am having a bit of a battle with my 14W at the moment because if I connect the park wire it blows the fuse on parking.
All the best
Berni"
Hi Berni, the wiper switch that you show in the Ebay link will not work correctly with your 14w wiper motor as it does not make the same connections internally as the original switch.
The o/e switch has 4 terminals and works as follows :-
Off connects terminals 1&2
Slow connects terminals 2&3
Fast connects terminals 3&4
Terminal 1 connects to the wiper plug pin 2 with a white/yellow wire
Terminal 2 connects to the wiper plug pin 5 with a yellow wire
Terminal 3 is switched 12v feed and is not connected to the wiper plug
Terminal 4 connects to the wiper plug pin 3 with a light green wire
Wiper plug pin 1 is an earth (black wire)
Wiper plug pin 4 is a 12v feed from the fuse box (green wire)
The switch that you have merely connects a common pin (B) to the others in turn… see below.
Brian.
Hi Brian
I am not doing well here am I haha. Looks like it will be going back to the ebay seller.
Rats and thank you again!
Berni
Hi Berni, Before you send the switch back try adding a relay into the park circuit as shown in the second diagram below … I presume that you have wired it as per the first diagram…
Brian.
I cut the back off the standard switch removed the rubber bulb and replaced it with a spring and micro switch that operates the washer pump via a relay.
I 3d printed the micro switch mounting. Quite happy to share the file if anyone is interested.
Baggy
Hi Brian
Thank you so much.
I am going to try this tomorrow if i get the time or otherwise at the weekend.
Will let you know how it goes!
All the best
Berni
Hi Berni
I’ll be interested to know if the relay breaks the connection between the yellow and white yellow wires before the switch applies +12v to the yellow! If you find that you’re still blowing fuses then I can come up with a diagram using a change-over relay…
Brian.
Hello Brian
You appear to have won a prize. Following your advice above the switch works and no longer blows a fuse on park. The relay is energised when the wiper is at the park position, but I guess that does not matter as its on a switched live so no battery drain issues.
Great thinking!
Many thanks
Berni
Pleased it worked for you Berni.
There is a modern alternative to the original switch but it comes at a price… Lucas Replacement Wiper/Washer Switch 155496
Brian.
Could we revisit this wiper switch issue a minute, not the part about the windshield washer squirter switch but just the wiper switch going to the 14 W motor through the AP (auto park) switch. Because I replaced the AP switch and checked out my motor by working it independently and I still can’t get The wipers to come on or not blow a fuse. So the last piece to buy and try is the wiper switch itself, which I show below that I got from a US supplier for my +2, and I don’t see that there are four terminals that I can figure out how you’re saying to connect it, but rather there are six terminals, so how would this be wired to the auto park switch? And I do see in the wiring diagram for the car that there should just be four wires coming off the switch, which also confuses me as it does appear this is a correct replacement switch. And also the plug that goes into the back of the auto park switch just has four wires in it as well. So how would it work with the wires coming off of this six prong switch? Thanks, Gordon.
Hi Gordon,
As you say, the wiring diagram shows 4 wires connected to the dashboard switch and appears to indicate that they are connected to the ‘corner’ terminals. This would make sense as the two middle terminals are connected across the back of the switch shown in your picture above.
Would you check the terminal connections with the switch in the off/slow/fast positions using the numbers in the picture below?
I have quoted you above from an earlier post in another thread as I am confused when you state that there are 4 wires from the switch to the motor plug (or have I misunderstood your comment?) There are only 3 wires from the switch to the motor plug plus an earth and a seperate live feed for the park function.
Brian.
Not sure how to know which is top there, but when I did continuity with what I took to be the top, this is what I get
Hi Gordon,
It would appear that you got the switch the right way up… the off position connects the lower two corners as shown in your first diagram (‘switch at top’). Wire the switch as shown in the attached drawing and it should be working correctly.
As stated previously there is no connection to the centre two terminals.
Be aware that if you are bench testing the motor without the wiper mechanism attached then the motor may not stop at the park position, the motors inertia taking it past the parking point due to the lack of 'drag’from the wiper blades.
Brian.
I have just fitted one of these switches, obtained from Sue Miller. The wiring is different to the original switch as explained above, so the Lotus wiring diagram is wrong for this switch. I have done the attached sketch with wiring colours, what it does and where it goes on the terminal block at the motor. Sue did say these switches are a bit deeper than the original and you need to remove the raised wooden spacers on the back of the dashboard to get them to fit.
I fail to see how that is differently wired in comparison to the drawing in my previous post.
I left off the colour scheme for the wires on the parking switch as my early Plus Two uses totally different colours to the later cars…( T2 is blue/yellow, T3 is light green and T5 is yellow )
Brian.
Yes it is the same as your diagram. It is different to the Lotus wiring diagram for the original switch. I added the wiring colours as used on later cars.
Yes, I’m interested because I’m looking for this pump (does anyone know where to find it?) attached by screws to the back of the two-function switch — a single-speed sweep and a dimmer, by turning the switch knob on the Elan S21966
