Windshield washer issue

Hi can anyone help me diagnose my windshield washer pump on my 1981 C10.
Wipers work but nothing happens when I push the wiper button in with the wipers on.
I have a pretty good idea how it’s supposed to work.
I don’t hear any click or other noise at the pump. So how do I determine if it’s the switch or the washer coil?
Thanks

16927 said:

Hi can anyone help me diagnose my windshield washer pump on my 1981 C10.
Wipers work but nothing happens when I push the wiper button in with the wipers on.
I have a pretty good idea how it’s supposed to work.
I don’t hear any click or other noise at the pump. So how do I determine if it’s the switch or the washer coil?
Thanks

Click to expand...

Does your 81 have an electronic pump? Nice part of washer pumps is they are on/off go apply some power to the power for pump. Work? Wiring most likely i speculate at least. But the switch could be too.
If it’s vacuum, those things die al the time just put in a universal reservoir or junkyard am electric and install a momentary switch. Ezzzzz

My 85 is doing this exact thing.
Not sure if the 81 is the same as 85 but if it is, the +12v is supplied by a fuse directly to the pump when the key is on. If you have a volt meter you can check both wires at the pump for voltage - I don't remember which color it will be (pink or white).
If you have voltage the the switch is not completing the ground when you press it. Could be (1) bad switch (2) bad ground wire between switch & pump.

I haven't finished testing mine but I am sure it'll be the switch.

AuroraGirl said:

Does your 81 have an electronic pump? Nice part of washer pumps is they are on/off go apply some power to the power for pump. Work? Wiring most likely i speculate at least. But the switch could be too.
If it’s vacuum, those things die al the time just put in a universal reservoir or junkyard am electric and install a momentary switch. Ezzzzz

Click to expand...

Do you have a good how-to for this or a video?

tophat36 said:

Do you have a good how-to for this or a video?

Click to expand...

The only difference with this video to the square is you would be using the later reservoir with a pump in it (85 or so +)

Unless you were asking about rebuilding the original pump on the motor which has a rebuild kit floating around out there NOS