Washer Fluid Problem (unique)

Alphasig83

New Member
Joined
Feb 5, 2022
Messages
3
Location
Bucktown PA
Hey all,
New YJ owner… 88 Sahara with 7800 miles… all original and uncut.

I have been going through all systems as I bought this Jeep last month from a collector who had it sitting in his garage for a few years. One issue has me going crazy…

On the 88, wiper stock is on the left of the column, and you toggle a thumb rotator forward for washer fluid and temporary wipers. Backward washes rear hardtop, which this rig does not have.

When I topped off the fluid, tested the washer and nothing happened. Also, wipers didn’t come on temporarily. The wipers still work when switched on from the stock. I confirmed with an air compressor that the line is clear to both sprayers, confirmed all fuses under the dash near the parking brake are good, I see no loose wires. I also pulled the OEM washer pump and installed a new one from Quadratec. Still nothing.

I got the volt meter out and when the washer pump was disconnected, I probed the wiring harness plug and it came back at 8+volts, and the wipers actuated… I also reversed the poles on the motor thinking someone may have been in there before but nothing… so I know the fuse in the circuit is good, the stock switch works, wiper motor works, electric at the terminal, but can’t get the pump to work…

Lastly, not sure if related, there’s an unknown female plug hanging loose just outside of the terminal block under the hood… I don’t think it’s related, but not 100%.

I have also checked the wires for mice or splices and everything looks factory new…

Any thoughts on this one? Help is appreciated.
 

RBH261

New Member
Joined
Jan 10, 2023
Messages
2
Location
Martinsville VA
Hey all,
New YJ owner… 88 Sahara with 7800 miles… all original and uncut.

I have been going through all systems as I bought this Jeep last month from a collector who had it sitting in his garage for a few years. One issue has me going crazy…

On the 88, wiper stock is on the left of the column, and you toggle a thumb rotator forward for washer fluid and temporary wipers. Backward washes rear hardtop, which this rig does not have.

When I topped off the fluid, tested the washer and nothing happened. Also, wipers didn’t come on temporarily. The wipers still work when switched on from the stock. I confirmed with an air compressor that the line is clear to both sprayers, confirmed all fuses under the dash near the parking brake are good, I see no loose wires. I also pulled the OEM washer pump and installed a new one from Quadratec. Still nothing.

I got the volt meter out and when the washer pump was disconnected, I probed the wiring harness plug and it came back at 8+volts, and the wipers actuated… I also reversed the poles on the motor thinking someone may have been in there before but nothing… so I know the fuse in the circuit is good, the stock switch works, wiper motor works, electric at the terminal, but can’t get the pump to work…

Lastly, not sure if related, there’s an unknown female plug hanging loose just outside of the terminal block under the hood… I don’t think it’s related, but not 100%.

I have also checked the wires for mice or splices and everything looks factory new…

Any thoughts on this one? Help is appreciated.
Did you ever find the issue? I have the exact same symptoms.
 

kjmagsig

Member
Joined
Sep 14, 2021
Messages
38
Location
Wisconsin
Ditto that, mine was working when I bought it, after a month or so the washer pump quit working and the wipers don't cycle. My wiper delay also only works when it's very cold outside ( single digits.) I'm thinking this may be a dirty contact(s) in the wiper control unit? Does anyone have any ideas?
 

Gary747

Member
Supporting Member
Joined
Nov 7, 2020
Messages
51
Location
Lancaster, CA
I know what I'd look for first... a bad/open ground. First look under the hood, front of engine compartment just behind the headlights, left and right side, there are ground wires leading to the right/left side marker lights held down with sheet metal screws. Make sure those contacts are clean and snug. Then, on the right side of the engine block below the cylinder head and roughly above the starter, there is a grounding stud with more than one ground wire attached to it. Loosen this, clean, and reinstall.
Lastly, I installed a braided grounding strap across the right front engine mount to insure a good engine to frame grounding path.
 

RBH261

New Member
Joined
Jan 10, 2023
Messages
2
Location
Martinsville VA
I know what I'd look for first... a bad/open ground. First look under the hood, front of engine compartment just behind the headlights, left and right side, there are ground wires leading to the right/left side marker lights held down with sheet metal screws. Make sure those contacts are clean and snug. Then, on the right side of the engine block below the cylinder head and roughly above the starter, there is a grounding stud with more than one ground wire attached to it. Loosen this, clean, and reinstall.
Lastly, I installed a braided grounding strap across the right front engine mount to insure a good engine to frame grounding path.
Thanks for the reply. I've been through the grounds and splices in the wiring harness. When there is a load on the washer pump circuit, + voltage drops off while the ground remains stable. I'm leaning toward the wiper delay module. I took it out to inspect the internals and there had been water intrusion. However, I have continuity everywhere I should, the relay works and the diodes check out. I'm guessing caps and/or resistors bad due to age. I've seen a thread with info for parts required to refurbish the module. I may give that a shot, but first I want to bypass the module to see what results I get. I'll be doing that this evening.