Wiper Motor: Testing and Inspection

Fig. 2 Wiper Motor Current Draw Test:

1. Disconnect positive battery terminal.
2. Disconnect wiper motor linkage.
3. Connect positive lead from multimeter to center terminal on motor end plate and the green lead from tester to battery positive post, Fig. 2. Motor terminals are too small to make necessary test connections without using connector sleeves and wires between motor terminals and tester. Suitable connector sleeves should be crimped onto both ends of wires.
4. Connect jumper wire from battery negative post to low speed terminal on motor end plate and read current draw, then move jumper wire from low speed terminal to high speed terminal and read current draw.
5. If current draw exceeds 3.5 amps, ensure output arm or windlatch mechanism are not binding or damaged, and replace wiper motor.