Originally Posted by thebuick
how can i test the pump and wiper motor on my car? i do have a multi-meter. any other things i can try?
With your multimeter, probe the connectors of each to determine which is the ground lead, and the other will be the 12V lead. With wiper switch in the on position, see if you can measure 12V on the harness connector. If you can't then it'* a problem before the motor. If you can then it is either the motor or a fouled connector. Same goes for the pump but you'll need a 2nd person to activate that while you measure.
To test the motors yourself you can use a fused jumper lead from the battery positive and non-fused from ground inserted into the motor power (input) socket. Do make sure it is fused for safety'* sake, though I don't know the right value, probably good enough to use a 10A or 15A fuse. You can also measure resistance across the motor socket contacts with it unplugged, should be a fairly low ohm measurement but not really really close to zero (less than 2 ohms) which would indicate a short.
If the wiper motor grounds itself through a mounting bolt instead of a ground wire then make sure that area isn't excessively corroded.