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Topic: Windshield washer pump connections

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Windshield washer pump connections (1/12)
 4/8/15 5:23pm
egon48
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I have a 1970 L46. Iam trying to get my windshield wiper pump to work,it has 2 weird connections that i cant find any wires to connect to it.Can anybody help with this ? They poke out of the plastic cover and they are curled around,i tried to upload a picture but i get a error message??

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Re: Windshield washer pump connections (2/12)
 4/8/15 10:08pm
Vman73
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Egon - just finished some work on the windshield washer pump on my "73, I think these are the wires your talking about.



There is a yellow wire coming from the bottom of the picture that connects to the washer pump, the blue wire goes out the other side and up towards the washer pump housing.

 

The wires have barrel type connectors, I've unplugged the yellow wire in this picture so you can see what the end looks like.

Both of the wires come out of the main harness, just underneath and to the passenger side of the windshield wiper motor. According to the wiring schematic the blue wire comes from the wiper/washer switch and the yellow wire comes from the fuse block. Hopefully your wires are still there and just got tangled up in the harness somewhere.   





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Re: Windshield washer pump connections (3/12)
 4/12/15 4:18pm
danascar
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Sort of same problem. Finally gave up getting original washer pump to work and bought universal mount pump for a 74. Which wire feeds power to the pump when switch is pushed in for the washers? As a side note when testing wires as soon as ignition switch is turned on both the yellow and blue wires in the above photo get power, so I'm guessing neither of these wires are the one I need to splice into to get power to universal pump from wiper switch.

|UPDATED|4/12/2015 1:18:42 PM (AZT)|/UPDATED|


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Re: Windshield washer pump connections (4/12)
 4/12/15 8:41pm
Vman73
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Dan, certainly no electrical expert on this end, but my guess was the yellow wire from the fuse block would be 12v positve with the key on and the blue wire is the switched ground from the wiper/washer switch. I disconnected both leads on my car and checked, no voltage either lead with key off, 12v at the yellow lead with key on and still zero on the blue. My guess is if you have 12v at your blue wire with key on, you have a short somewhere downstream that is providing 12v to that wire. Looking at the schematic, the blue wire (they refer to it as DK BLU, dark blue), goes from the washer to the switch then back to the wiper motor then to the black wiper motor ground. Assuming your wipers work okay, I would think the culprit may be a short in the wiper/washer switch. I believe Willcox Corvette has an online proceedure to bench test the switch for both wiper and washer functions, that should confirm if your switch is functioning properly. Beyond that, I would continue to trace the dark blue (ground) side of the circuit back with a volt meter to find out where the 12v short is occurring. Let me know if I can check anything else on my end to help you out.

|UPDATED|4/12/2015 5:41:35 PM (AZT)|/UPDATED|


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Re: Windshield washer pump connections (5/12)
 4/13/15 9:29am
danascar
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Thanks for the info John! The only thing I can add right now it that when I turn on wipers and then push switch in to activate the washer motor I do hear a click like the washer motor gets power from the switch. So the washer motor is not getting power all the time, if that means anything???

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Re: Windshield washer pump connections (6/12)
 4/13/15 12:39pm
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Vman73 said: the blue wire is the switched ground from the wiper/washer switch.


That's the key statement......the wipers on these cars are controlled by the GROUND side of the circuit. The wiper motor should have 12v to it anytime the key is on....the ground is provided by the wiper switch on the dash, and that switch MUST be properly grounded for the wipers to work. A lot of folks have resorted to installing a separate ground to the switch housing to make sure it will always have a good ground. 9 time out of 10, if the upper dash panel has ever been removed, the screws were not put back in the right spot, and now the wiper switch has either a poor ground, or none at all. Ouch


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Re: Windshield washer pump connections (7/12)
 4/13/15 1:33pm
danascar
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Adams' Apple said:
Vman73 said: the blue wire is the switched ground from the wiper/washer switch.


That's the key statement......the wipers on these cars are controlled by the GROUND side of the circuit. The wiper motor should have 12v to it anytime the key is on....the ground is provided by the wiper switch on the dash, and that switch MUST be properly grounded for the wipers to work. A lot of folks have resorted to installing a separate ground to the switch housing to make sure it will always have a good ground. 9 time out of 10, if the upper dash panel has ever been removed, the screws were not put back in the right spot, and now the wiper switch has either a poor ground, or none at all. Ouch

Does this also apply to the washers too Joel? If so, am I going to have to install a separate switch for my 
universal washer pump?

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Re: Windshield washer pump connections (8/12)
 4/13/15 1:45pm
Vman73
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Dan, the click that you hear when you push the washer switch sounds right, but having 12v at both the yellow and blue wires with key on does not. +1 on Joel's comment regarding switched ground. I wasn't sure if they used the switch mount up in the dash as ground or used the ground circuit back at the wiper motor. I would still bench test the switch, then run a separate ground wire to the switch body and see if that makes the difference. Unless I'm missing something, you should be able to wire in your after market washer pump with the yellow(+) and blue(-) and have it work with your existing switch. Let us know how it works out.

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Re: Windshield washer pump connections (9/12)
 4/13/15 5:58pm
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Vman73 said:  you should be able to wire in your after market washer pump with the yellow(+) and blue(-) and have it work with your existing switch.

I think it should work like that, too. I think the problem of having 12v on both wires is the pump itself is not cycling, even tho the solenoid is kicking in("click"). Once the solenoid kicks in, it will hold that ground until the pump cycles completely, and the little arm comes around to click the solenoid ground terminal loose. Then it will release the ground. On the other style pump, all it needs is 12v, and a ground. It can be controlled either from 12v, OR the ground side. Using the original switch on the dash, you would run 12v(key ON only) to the pump, then the ground side would go to the blue wire at the wiper motor. Once you push the "Wash" switch on the dash, it will ground the pump, and pump water. With this set-up, you will have to HOLD the switch down as long as you wanted the washer pump to pump. Thumbs Up



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Re: Windshield washer pump connections (10/12)
 4/13/15 6:31pm
danascar
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Thanks Joel Thumbs Up I knew if anybody had the answer, you would...what would we do without ya Exclamation


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DanT

Re: Windshield washer pump connections (11/12)
 4/14/15 4:04pm
danascar
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Adams' Apple said:
Vman73 said:  you should be able to wire in your after market washer pump with the yellow(+) and blue(-) and have it work with your existing switch.

I think it should work like that, too. I think the problem of having 12v on both wires is the pump itself is not cycling, even tho the solenoid is kicking in("click"). Once the solenoid kicks in, it will hold that ground until the pump cycles completely, and the little arm comes around to click the solenoid ground terminal loose. Then it will release the ground. On the other style pump, all it needs is 12v, and a ground. It can be controlled either from 12v, OR the ground side. Using the original switch on the dash, you would run 12v(key ON only) to the pump, then the ground side would go to the blue wire at the wiper motor. Once you push the "Wash" switch on the dash, it will ground the pump, and pump water. With this set-up, you will have to HOLD the switch down as long as you wanted the washer pump to pump. Thumbs Up


Thumbs Up Thumbs Up Thumbs Up  Works exactly as advertised Joel, learn something new everyday Big smile



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DanT

Re: Windshield washer pump connections (12/12)
 4/14/15 10:35pm
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Heck..even a blind squirrel finds a nut every now and then....LOL
Glad it worked out for ya, Dan!


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