New Windshield Washer Pump wont Pump
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
New Windshield Washer Pump wont Pump
I installed a new washer pump on my 74 and it's not pumping although wipers are working great!First thing I did before installing it was to check motor to make sure low speed worked, High speed worked and also to park itself on off.First question is, The two wires that connect to the front of pump (butt connectors)have power when connected to pump without the wiper motor running. When I disconnect them from the pump and test for power again, only one has power. Is this normal?also I tried to align the pump cam as close as possible and I think it's right on target but not 100% sure cause I believe the shaft that engages to the cam shifts out when motor is activated to engage on cam. also does pump need to be primed? the prong on the screw for the pump is also connected to the black ground wire. I checked for ground and motor and pump seem to get ground from here.
Thanks in advance
Thanks in advance
Last edited by redcruz1120; May 17, 2016 at 11:22 PM.
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,170
From: Hermosa
Sounds like you may have the ground hooked up to the wrong prong. I'm not familiar with what plugs are on the pump, but you mentioned having power to two prongs when wire connected and only one when disconnected. That would indicate to me that the power is passing through the motor winding and then to the other wire, hence the reason for power on both when connected.
You need power to pass through the motor winding to ground via the activation switch for it to run.
If you accidentally connect power to ground without passing through the motor, you should be blowing a fuse.
You need power to pass through the motor winding to ground via the activation switch for it to run.
If you accidentally connect power to ground without passing through the motor, you should be blowing a fuse.
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
Sounds like you may have the ground hooked up to the wrong prong. I'm not familiar with what plugs are on the pump, but you mentioned having power to two prongs when wire connected and only one when disconnected. That would indicate to me that the power is passing through the motor winding and then to the other wire, hence the reason for power on both when connected.
You need power to pass through the motor winding to ground via the activation switch for it to run.
If you accidentally connect power to ground without passing through the motor, you should be blowing a fuse.
You need power to pass through the motor winding to ground via the activation switch for it to run.
If you accidentally connect power to ground without passing through the motor, you should be blowing a fuse.
Team Owner
Joined: Sep 2006
Posts: 31,170
Likes: 4,246
From: Westminster Maryland
Hi rc,
"also does pump need to be primed? "
Yes, the pump often needs to be primed to get it started from dry… but even if it's not primed you should hear it operating… it makes a pretty distinctive sound.
Good Luck!
Regards,
Alan
"also does pump need to be primed? "
Yes, the pump often needs to be primed to get it started from dry… but even if it's not primed you should hear it operating… it makes a pretty distinctive sound.
Good Luck!
Regards,
Alan
Former Vendor
Joined: Aug 2006
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From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The pump has to be primed to work and you do this by sucking some water into your mouth and blowing it into the middle nipple on the pump.
If the pump isn't engaging check power and ground on the two wires, the pump is hot waiting for ground and so the yellow power wire should have power and the dark blue will only be grounded when the wiper switch is pushed inward.
Willcox
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
The pump has to be primed to work and you do this by sucking some water into your mouth and blowing it into the middle nipple on the pump.
If the pump isn't engaging check power and ground on the two wires, the pump is hot waiting for ground and so the yellow power wire should have power and the dark blue will only be grounded when the wiper switch is pushed inward.
Willcox
....Thanks!!
Last edited by redcruz1120; May 18, 2016 at 10:29 PM.
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Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,850
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The pump should make one cycle when the electromagnet is activated. If you run power and ground direct to the pump you should hear the electromagnet click and pull the small lever upward and then the wiper motor takes over the pumping action of the washer pump. If you direct power and ground the pump and the electromagnet engages then the washer pump electrical portion is working fine.
The single ground is enough as long as the ground is a good one. The ground for the motor is also shared with the heater blower motor.
Willcox
The single ground is enough as long as the ground is a good one. The ground for the motor is also shared with the heater blower motor.
Willcox
Last edited by Willcox Corvette; May 19, 2016 at 12:05 PM.
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
The pump should make one cycle when the electromagnet is activated. If you run power and ground direct to the pump you should hear the electromagnet click and pull the small lever upward and then the wiper motor takes over the pumping action of the washer pump. If you direct power and ground the pump and the electromagnet engages then the washer pump electrical portion is working fine.
The single ground is enough as long as the ground is a good one. The ground for the motor is also shared with the heater blower motor.
Willcox
The single ground is enough as long as the ground is a good one. The ground for the motor is also shared with the heater blower motor.
Willcox
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,850
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Willcox
Thread Starter
Drifting
Joined: Feb 2007
Posts: 1,498
Likes: 206
From: Pearland Texas
St. Jude Donor '09
Did you get the pump from us? If so email me the order number to support@Willcoxcorvette.com
Willcox
Willcox
Thanks again!
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,850
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
