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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Doh! on April 14, 2007, 07:42:48 pm
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I have had this truck for 13 years and it is my daily driver. Now I am in Utah and I have to pass inspection. Can anyone out there tell me why my windshield washer pump will not work? I checked at the wires and all I get is about 1.5-2 volts and the pump doesn't do anything at all. The pump is brand new (I replaced it thinking that was the problem). Does this thing go through a relay or does power come directly from the switch? Any info would be greatly appreciated. Thanks
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Well, there's your answer then, the voltage isn't making it to the pump motor. I would first try to put the red lead from the meter on the power wire to the pump and then take the black meter lead to a known good ground like the engine block. If voltage is still low, it has something to do with the power wire itself. If you have good voltage, then test with the black meter lead to the other wire in the connector and if no good voltage then it is the ground wire.
Next, you'll need to see the source voltage at the fuse block. Go up under your dash down by the e-brake and you will find a fuse for the washer pump and wipers. Simply test the back of the fuse on the openings to see if there is power. If no power there, then it gets a bit more tricky, because then its time for digging through that wad of wires going into the fuse block. I highly doubt that is it though. I bet you have some corrosion on a ground somewhere, or a poor connection.
Good luck!
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I finally got back out there and fixed it. The switch works perfectly I found with a meter. There is just not enough current to run the little motor for some reason. Looks like there might be some corrosion however I cannot find any. I just got a relay and hooked that up and it works perfectly. I am just going to run that way for awhile as I am thinking that the engine compartment needs to be rewired and I don't have the time nor the resources to do it right now.
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how are you hookin up tyou meter leads to get that reading? Check it in parralel not in series.