Post by Phil Nottingham on Jan 8, 2009 19:39:46 GMT
I had intended to do one next time I have opportunity - its not as complicated as it looks and makes sense when its in pieces and the logic of the reverse park mechanism is seen.
This is an entirely separate circuit to the motor circuit with its separate feed. The motor circuit has another feed via the speed control resistor switch and this switch apart is the same as any car with with twin speed Lucas wipers so perhaps Jags/Humbers etc which I assume have them
Help please; I had to take the dash pod and binnacle off the car to refinish the wood panels and to replace some of the switches. Everything worked before, but some switch handles were broken or corroded. After reassembling I got everything to work except the wipers. I have redone things numerous times and believe it is correct but no go. I connected the wires to bypass the rheostat switch and still no action. This is a picture of the wires attached to the wiper switch and the colour codes seem all as per the WSM diagram based on the numbers stamped on the switch itself. I tried putting another switch back in and still no action. The fuses all seem fine. i257.photobucket.com/albums/hh221/kennethnelson/Rover Wiper Switch/100_3570.jpg[/IMG] Looking at the back of the switch from right to left the top row is (1)yg (3)ng (5)rg. From right to left the lower row (again looking from the back) is (2)ug (4)earth (6)wg
What could I have done to mess this up? Any suggestions gratefully accepted!! Ken
Thanks Phil. I checked your wiring diagram and it seems to match Colin and my diagrams, so it appears that my switch is wired correctly. I copied the pertinent part of your diagram and include it here:
I wonder if I can bypass the switch to see if the wipers still work OK? The rheostat can be bypassed and then it appears to me that the main power to the motor would be from red/green in to the motor and then to earth. So if I "hot-wired" 12 volts to red/green at the switch would the wipers run?? Or would I burn it up because of the back and forth circuit? Is there any other way to check if the switch is working? I'm still trying to think this one thru to find where my problem occurs. Any thoughts out there? Thanks, Ken
Post by johnwp5bcoupe on Nov 26, 2010 10:12:49 GMT
Ken it looks as though you have connected it all correctly! and it should work I test these motors on the bench and it is difficult because of the field winding to "Hot Wire"! if you are not careful you can burn the windings out so protect with a low amp fuse
Thanks John. I'm going to have try to check things out further, but will go slow since I don't want to burn out the motor or ruin the switch. It's kind of perplexing! I'll keep you all posted if/when I figure more out. Ken
Hi Ken, have you checked the ground wire from the wiper motor to car frame, this is just as important as any supply to the motor. Simply do a voltage drop test at the ground terminal of the wiper motor with the system switched on. Check from the ground terminal to the car body work with all the wires connected, if you have any voltage above .03 volts you have a defect in this part of the circuit, worth a try. Hope this helps.
Hi Steve and Phil and All; I checked and I don't seem to have a voltage drop across the ground wire, ie I have continuity to earth. I'm wondering if my wires are messed up at the heater switch or ignition switch and not sending power to the wiper switch? It appears to me that there is a Brown/purple wire coming off ignition switch to the heater switch and another out of the heater switch to the wiper motor on the wiring diagram (my car is a Mk IIC positive earth car). These Brown/purple wires are only "on" when ignition is switched on (ie the wipers and heater won't work unless ignition is on as is proper). I have one Brown/purple wire off the ignition going to the back of the pod wiring-? does it go to the wiper motor (I note a Brown/purple connects to a Green at the wiper motor). Wipers worked fine before, and fuses are good. If the earthed power circuit is good, since the wipers are "parked" now, they wouldn't move if switch is on or off. So I suspect there is a power problem to the other "normal" running circuit, but am fuzzy on how the power gets connected and turned on and how I could possible hook a 12 volt source somewhere to test it? Clearly this is a VPP (Very Perplexing Problem!!!!).
I also found 2 wires (? Red/black) going into a double bullet connector with nothing attached on the other end. I've tried adding 2 pictures to show these. Any and all suggestions greatly appreciated!
Post by Phil Nottingham on Dec 12, 2010 22:32:44 GMT
Without looking I am not sure - Red/Black is side-lighting circuit - Black tracer means its via earth - and should go to O/s side and tail lamps. See what happens with sidelights on with a circuit tester
Per WSM diagram Brown/Purple does feed the motor via the Heater ignition switch feed - it does not go via Wiper switch. The wiring is slightly different to the V8's as they have more fuses
Usually wiper motors are ignition fed and switched earth. The ignition feed at the switch is for the park switch. so i think your problem may be the park switch. Sorry to be vague but I havn't got my books with me at the moment and I am trying to work from memory.
Weather warmed up now and I still can't get my wipers to work. I think the spade connections at the switches are all connected correctly, but perhaps I messed up with the bullet connectors?
I have three wires with bullet connectors to hook up. One is a brown/purple which connects with a single connector to a brown/purple coming off the ignition switch. This I think is the power feed for the auto park (a/p) circuit and powers the motor when ignition is on. Since the car stopped with the wipers "parked" last, even if this circuit is hooked up correctly it won't run the motor since ground line from the motor is interrupted in this position.
There are two short fat wires with bullets that come out of the center of the loom-I think now these are probably red/green and white/green. There was a double bullet connector and I thought these wires went into one end of that, with nothing connected to the other end (ie, it just joined these wires together). I see no other wires with bullet connectors anywhere behind the instrument pod.
Have I screwed something up, or missed another connection that uses a bullet and doesn't go to a spade switch connector? All help appreciated before I go to find another kind of bullet to end these problems with! Ken PS The brown/purple wire at the wiper motor does show 12 volts of power on a voltmeter when the ignition is switched on.