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> Wiper switch differences, trying to add an elec. washer switch
Eric_Shea
post Feb 29 2012, 09:25 AM
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Interesting Mark. So if I pull my stalk and activate the pump, it should run the wipers what; 4 times? But you're saying the load from the pump will affect this?
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Valy
post Feb 29 2012, 09:44 AM
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QUOTE(Eric_Shea @ Feb 29 2012, 07:25 AM) *

Interesting Mark. So if I pull my stalk and activate the pump, it should run the wipers what; 4 times? But you're saying the load from the pump will affect this?

Eric, you're good. Your switch has separateed contacts for the pump and relay.
There were some out there that tried to use the same (brown/black) wire for both functoins.
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Eric_Shea
post Feb 29 2012, 10:01 AM
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Whew...
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Bartlett 914
post Feb 29 2012, 01:54 PM
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QUOTE(Eric_Shea @ Feb 29 2012, 09:25 AM) *

Interesting Mark. So if I pull my stalk and activate the pump, it should run the wipers what; 4 times? But you're saying the load from the pump will affect this?

Hi Eric

The relay for the intermittent wipers will not work properly if you add a washer pump to the circuit. The resistance of the relay coil or the pump motor will render the intermittent inoperative. The circuit I made solves this problem. It is a high impedance relay driver. That is, the power to pull the relay is very low. Somewhere TTL signal level. The relay coil and the motor windings are low resistance. I made a perf board circuit as shown in the other thread. It is small and can be hidden. I may have another one I can send you or you can make your own.
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Bartlett 914
post Feb 29 2012, 02:23 PM
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IIRC the brown white wire to the intermittent relay uses 3 signal levels. At ground, the intermittent wiper function is off. Pulse to 12 volts (as in a wiper stalk pull) and the intermittent relay will cause the wipers to give a few wipes. Open, and the intermittent function works. Changing the resistance to some extent (not enough to be useable) will change the delay time. If you put a relay with one grounded to this connection Washer pump coil or relay coil), the signal to the intermittent relay will appear to be grounded and no intermittent function.
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Valy
post Feb 29 2012, 02:26 PM
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Krieger
post Feb 29 2012, 07:59 PM
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Which fuse Burns? -5th one from right, it has the wiper/cig lighter on cover.
What exactly you turn on? When I turn on the wipers the motor starts to move then the fuse cooks
What's connected to the switch? All stock...except hot wire for cig lighter powers vdo fuel gauge, which functions correctly.
Have you done any modification? Pictures help very much. The harness is all stock otherwise. I do not have anything fancy added for the wipers.

Car is 75.
I replaced the 75 plastic steering column housing, with an earlier 73/4 metal unit. This is the assembly that holds the key/lock, wiper washer, turn signal
????
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Valy
post Feb 29 2012, 08:15 PM
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Try this:
ignition off. Put the which in high speed position and turn on the switch.
If the wipers work then your short is in the return line from the motor to switch.
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Krieger
post Feb 29 2012, 08:55 PM
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I put a 16 amp in and put the wiper switch all the way up, key on, zap! it immediately fried.
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Valy
post Feb 29 2012, 09:17 PM
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QUOTE(Krieger @ Feb 29 2012, 06:55 PM) *

I put a 16 amp in and put the wiper switch all the way up, key on, zap! it immediately fried.


OK. No more destructive tests for now.
I assume that the wipers didn't move at all, correct?
take out the connector from the switch and measure the resistance between the wires and ground.
here is what you should get:
green/white 0 ohm or very low
Red/white infinite.
black purple will read the motor resistance
Black blue should read higher resistance than previous one.

If all is good, next the switch will need to come out. If that's not an isstrue, you can take it out now to test the wires as crawling under it is a PITA.
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Krieger
post Feb 29 2012, 09:27 PM
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Wipers didn't move. I am going to pull out the steering wheel now.
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Krieger
post Feb 29 2012, 09:55 PM
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So I am measuring between the ground terminal on the plug (body harness) that goes into the back of the wiper switch and the other wires on that same plug?

here is what you should get:
green/white 0 ohm or very low---dont have a green/white, i have a black/green white
Red/white infinite.---red/gey?...
black purple will read the motor resistance---dont have
Black blue should read higher resistance than previous one.--dont have


My wires don't really match your descriptions...

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Krieger
post Feb 29 2012, 10:14 PM
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Plug


Attached thumbnail(s)
Attached Image
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Valy
post Feb 29 2012, 10:26 PM
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That's the signal switch connector. Look at the other one, smaller.
And use the car body for ground please.
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Krieger
post Feb 29 2012, 10:34 PM
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Doh! I figured that out and this is what I'm getting
green/white infinity!!!!?
black/ blue 0
black/ purple 0
red/black infinity
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Valy
post Feb 29 2012, 10:44 PM
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OK.
Green/white shows that your wipers are probably not completely parked. Don't worry about that for now.
The other two black ones show that your wiper motor is probably history or you have a short in the harness.
Can you switch the meter to the lowest ohm scale and repeat the measurement. You should get different readings, black/blue should be higher.
If bothe are still 0 it may be the harness.
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Krieger
post Feb 29 2012, 10:53 PM
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black/purple 10.7
black/blue 10.2
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Krieger
post Feb 29 2012, 11:03 PM
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Just got an old wiper switch of unknown origin. Plugged it in turn on ignition flick switch, wiper works no problems....
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Eric_Shea
post Feb 29 2012, 11:19 PM
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Andy... It's your switch. (IMG:style_emoticons/default/wink.gif)

Happy to help! (IMG:style_emoticons/default/biggrin.gif)
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Valy
post Mar 1 2012, 12:36 AM
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Eric, I knew you're going to master it! (IMG:style_emoticons/default/wink.gif)
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