My wiper motor DR3A works, when I put power to the switch then plug in the 2 wires the wipers start to work but only go half way then back and as soon i put the switch off it keeps blowing the fuse, do these need a rotary switch, I got this Lucas switch which I assumed was the correct one ,help much appreciated
Have you got the wiring the right way around. The motor should have an ignition feed and the switch provides a path to earth (like the self parking switch).
Have a look at wiring diagram 8 in the link below: -
Series 2 Wiring Diagrams (https://series2club.co.uk/2023_new_forum/index.php?topic=2.msg35#new)
I have posted up this DR3 wiring diagram a few times - it come from a respected classic car electrical book.
(https://www.wittsend.co.uk/wittsend_technical/images/Lucas_DR2-3_wiper_motor.jpg)
I've bench tested my own DR3 motor and it works well, self parks when it should.
If your motor is not working then it is wired up wrong or there is an internal fault on the auto park switch. Look for something shorting out inside the motor body.
Compared to the later Lucas 14W wiper motors the wiring for this type is really very basic.
There is nothing special about the dash switch - it's just OFF or ON.
:screen
On my wiper motor I have 2 wires that go to the switch and an earth from the motor to the body, then I have one live feed to the switch from the fuse panel and that's all I have, is this correct or am I missing something here,
I think you are missing something.
Look at the back of the motor, you will have 2 terminals and am earth point, as per the diagram ^^^.
The fused 12 volt supply goes to terminal 2
Terminal 1 connects to one side of the dash on/off switch.
Post a picture of your motor to confirm or otherwise.
Maybe it's totally the wrong switch, do I need a rotary switch, how does the screen wash connect etc
Here is a picture
Your green/red and green/brown wires are confusing you. They are not needed for this motor set up. Forget them. They are for the later Lucas 14W motors.
They are red herrings :red_herring
Place a wire (green) from the fuse box direct to terminal "2" on your motor. Take a wire from terminal "1" to your ON/OFF wiper switch. The other side of this switch you take to earth. You earth the wiper motor body.
The wipers should now work and auto park (self park) when you switch off.
Forget washers and rotor switches at this stage.
Find a simple Lucas ON/OFF switch and wire that up as per the diagram. Get the motor working without the "extras".
You can work the washers from a separate on/off switch. There's no reason to have them work off the same switch.
As washers were not standard equipment on Series 2s and early 2As owners/dealers had to make their own arrangements.
Rather than a standard ON/OFF switch they would use a push button. Press to work the washer. This is more logical/convenient than a traditional on/off switch.
Later Series 3s had a combined wiper/washer switch. A 3 position switch.
1) = off
2) = wipers on
3) = wipers on and screen wash
This last function of the switch was spring loaded.
Once you have ascertained your wiper motor works you could consider this more sophisticated set up.
Perfect, so for the earth do I connect from the switch to the terminal on the motor that's marked E which I assume is the earth one or do I earth it another way
Also that switch I got is a Lucas on off one so hopefully that will work
You earth the wiper motor body with a wire to an earth point on the bulkhead near by. Drill a hole and with an eyelet secure with a self-tapper screw.
For the dash mounted wiper on/off switch make another earthing wire, from the on/off switch to a point (behind the dash panel) on the bulk head. Drill a hole and secure with another self-taper screw.
You earth motor, and you earth the on/off switch.
:RHD
Perfect, going to try that now
Perfect wiring description I now have a working motor 👍🤞, my only problem is I seem to have a live feed to my switch all the time, so my wipers can work with no ignition on through the switch is this correct, also,I connected the green wire from no2 on my wiper motor to the fuse as per advice but have I done it correctly, green wire top right as per picture, also wipers only appear to go half way then back is this normal, thanks
If your green wire is connected to a permanent live on the fuse box, then yes, it will be switchable all the time. Pick a fuse that is only live when the ignition is on.
Yes, they should move more than halfway.
👍, what can I do , look at to make them go more than half way, thanks
You need to check and see if the motor is running the drive cable through full travel. If it is, your wiper motor may not have the right drive gear fitted. Open it up and operate it with the cable attached and see what is happening.
I have one of those wiper motors here, so if you get really stuck, I might be able to help.
Ideal, I will try and check it tomorrow
Having learnt from another post that yours is a 1970 model then in no way should it be having a Lucas DR3 wiper motor.
I suspect someone has been "playing".
Someone could have fitted an earlier bulkhead with the DR3 wipers ???
Seems a lot of trouble to retro fit DR3 wiper motor to a later bulkhead, but who knows.
I have no idea if these 2 wiper motors are interchangeable. It could explain why you are not getting a proper sweep of the screen.
That you have those green/red & green/brown wires is very strong evidence that your once had the correct Lucas 14W round bodied wiper motor at least as far as the wiring loom is concerned.
This means that the control cable to each wiper spindle via the gear boxes could well be the wrong part for the wiper motor you have :shakinghead
Remove the wiper motor and work the cable. Do the wiper blades give a good arc of sweep across each screen ???
Could be the wiper gearboxes are gunged up with solid grease ???
Could be the wiper motor is gunged up.
Without pics it's hard to know what parts you have.
As it's a 1970 model my thoughts would be to fit the correct wiper motor, i.e. the Lucas 14W.
But the problem is knowing what the PO has done :confused
It's a pity you are so far away, as a site inspection of what you have would settle the matter and lead to way forward.
I had believed it was the correct wiper motor for a 1970 ex military one, I had replaced the wiring loom which where the confusion is with wire codes
Here is my wipers working, I have noticed they are loose where they connect, I can pull them off easily so will look into that, I have now cleaned the windscreen 😂, just noticed I can't post a video
You'll need to host your video somewhere in the cloud!
Quote from: Wittsend on Mar 25, 2024, 02:33 PMYou'll need to host your video somewhere in the cloud!
Or upload it to YouTube and then link it to here.