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11-22-2012, 11:58 PM
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#1 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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what the heck are all those wires for on my wiper motor/pump?
So I have a problem that when I depress the washer button, it turns the pump and won't turn off until I turn shut the ignition.
My first guess was that there was some kind of problem with the switch itself, but after thinking about it over a beer and removing the cover from the washer pump I'm beginning to think there's something a muck with the over-complicated pump mechanism! That thing is like a Rube Goldberg machine!!! So far I can figure that the bottom set of 3 wires controls the motor, I'm assuming that the 3rd wire has something to do with high and low speed, The middle set of 2 wires controls the solenoid that engages and disengages that little armature thingy for the pump, but.. what the heck is the top plug for?? I have 2 extra motor/pump assy's but I also scored an in-reservoir reservoir and pump from some old 70's ford that I found wrecked in the bush. At this point it seems like the most hassle-free way to go would be to disable the OEM washer pump and wire up the ford pump. Am I good to pull the solenoid leads and hook them directly to the ford pump? Its winter time, and its damn scary when a semi passes you on the highway and your windshield turns into a wall of opaque sh*t!!
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-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" 
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11-23-2012, 12:31 PM
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#2 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: what the heck are all those wires for on my wiper motor/pump?
anybody?
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"
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11-23-2012, 01:25 PM
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#3 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,941
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Re: what the heck are all those wires for on my wiper motor/pump?
That will fix the non-functioning pump.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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11-23-2012, 03:47 PM
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#4 |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Re: what the heck are all those wires for on my wiper motor/pump?
The top plug is part of engine wiring harness and is where power comes from/thru firewall
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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11-23-2012, 05:34 PM
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#5 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: what the heck are all those wires for on my wiper motor/pump?
mine was acting up
turned out the "guts"of the switch were pushing out the back http://67-72chevytrucks.com/vboard/s...=421767&page=3 post 159
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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11-24-2012, 12:22 PM
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#6 |
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Another Day, Another Dollar
Join Date: Nov 2008
Location: North Vancouver, BC
Posts: 1,316
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Re: what the heck are all those wires for on my wiper motor/pump?
so,
I left the lowermost (3 wires) harness plugged in (wiper motor power) Unlplugged the middle harness (2 wire) pump solenoid and unplugged the upper harness (3 wire I think) with the top harness unplugged the wipers won't return to the down position on their own when the switch is turned off. that solves that mystery.
__________________
-78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square"
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