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Step 14Jaw Mechanism Wiring Harness
The jaw mechanism wiring harness includes a DPDT relay to allow reversing MOSFET PCB current polarity so jaw motor can run clockwise or counterclockwise. Two normally closed microswitches cut off the current to the motor when the turnbuckle reaches either forward or rearward travel limit. See circuit diagram.
For quick disconnects I used motorcycle style bullet nose connectors, but 3/16 spade quick-disconnects are more readily available at most hardware stores.
Polarity of jaw motor connections should be such that with the coil of the DPDT relay not energized the motor turns in the direction that moves the turnbuckle moves away for the chuck. An easy way to determine correct connection is by using jumper wires to test the connection between the motor and drill battery.
For quick disconnects I used motorcycle style bullet nose connectors, but 3/16 spade quick-disconnects are more readily available at most hardware stores.
Polarity of jaw motor connections should be such that with the coil of the DPDT relay not energized the motor turns in the direction that moves the turnbuckle moves away for the chuck. An easy way to determine correct connection is by using jumper wires to test the connection between the motor and drill battery.
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