Windsheild Washer keeps running

[hatzie]

Originally Posted by blindbug

You've got a short somewhere. There is a positive and negative lead to your washer pump (for my 86, it is on the back side of the fluid reservoir). Get a multimeter or a test light and connect the positive side to the positive wire of the pump lead and the negative to ground. If the light comes on, then you are getting power at a time when you shouldn't.

Not correct.

Why?

The 73-87 GM light truck wiper system switches the ground side of the circuit not the hot side.
The power leads on the Wiper and Washer connectors are circuit 93 in the GM wiring diagrams. These wires are always hot with the ignition on. From 79-91 circuit 93 should be the White wires.
This is my detailed post on wiper wiring in a steering column swap thread. http://67-72chevytrucks.com/vboard/s...40&postcount=8

That being said. The washer ground wire from the switch is circuit 94 in all of the 73-91 GM squarebody wiring diagrams.
Check whether the ground wire on the washer connector ( from 79-91 it's Pink ) is shorted to ground using a meter set to resistance or continuity. Attach one lead to the washer ground wire and the other to the block or some other suitable ground. If the meter reads less than infinity or it buzzes in continuity you have a short in the washer wire. Be alert. You'll let the smoke out of your meter if you hook it between the White ignition power lead and the block with the ignition on.
If you have continuity from the switched washer ground wire and the block then you have a short in that wire. If you don't then you have a borked wiper motor. It would not surprise me to hear the motor was not properly re-assembled by the re-builder.