Frankb
Well-Known Member
Car is a 68 Charger with factory 3 speed wiper motor. The wipers have not been operated for at least 20 years, however, I had the motor rebuilt (Jules did the work) before I reinstalled on the car many years ago. Currently dash is out to facilitate other maintenance so I thought this would be a good time to check wipers for correct operation. I followed FSM procedure for motor test:
Disconnect motor leads at bulkhead disconnect
Connect jumper wire from battery positive terminal to brown and red leads in bulkhead disconnect
Connect second jumper from the green lead to ground - (I connected directly to battery negative terminal)
Motor would not operate.
During the test battery positive cable was connected to battery but negative cable was not. I connected negative cable to battery and motor worked properly.
I know that DC power needs a continues circuit to operate. That's why I used the battery negative terminal as ground for the test. Power came in from disconnected bulkhead connector terminals E and F. How come the power did not return to the battery from terminal G - the ground terminal?
What am I missing here?
Disconnect motor leads at bulkhead disconnect
Connect jumper wire from battery positive terminal to brown and red leads in bulkhead disconnect
Connect second jumper from the green lead to ground - (I connected directly to battery negative terminal)
Motor would not operate.
During the test battery positive cable was connected to battery but negative cable was not. I connected negative cable to battery and motor worked properly.
I know that DC power needs a continues circuit to operate. That's why I used the battery negative terminal as ground for the test. Power came in from disconnected bulkhead connector terminals E and F. How come the power did not return to the battery from terminal G - the ground terminal?
What am I missing here?
