BOSS 6K4388 - Caterpillar

5N1955 ELECTRONIC SPEED SWITCH
1. Verify button. 2. Reset button. 3. "LED" overspeed light. 4. Seal screw plug (overspeed). 5. Seal screw plug (crank terminate). 6. Seal screw plug (oil step).Reversal Detection
1. Stop the engine and reverse the wires from PICKUP terminals SW1 (ESS-1) and SW2 (ESS-2) [this will simulate an engine reversal when the engine is cranked at least two full revolutions]. Connect the 6V3030 Multimeter or a voltmeter between terminals ESS-16 and ESS-5. Crank the engine at least two full revolutions and check for positive (+) voltage at ESS-16. If voltage is indicated, the reversal detection is functioning properly.2. To reset the reversal function, connect again SW1 wire (white) back on terminal ESS-1 and SW2 wire (dark green) back on terminal ESS-2. Crank the engine at least two full revolutions and check for positive (+) voltage at ESS-16. No voltage should be indicated.3. If no voltage is indicated, then reversal function has reset correctly.4. If voltage is still indicated, crank the engine again and check PICKUP wires for proper connection. If voltage is still indicated, check 7N7412 Sensor Assembly according to Procedure F. Different wiring connections must be used for engines with different rotation. For a specific engine rotation, use the correct connections that follow:*STANDARD ROTATION (Counterclockwise) Connect - White wire from sensor assembly to PICKUP terminal SW1 (ESS-1).Dark green wire from sensor assembly to PICKUP terminal SW2 (ESS-2).*REVERSE ROTATION (Clockwise) Connect - Dark green wire from sensor assembly to PICKUP terminal SW1 (ESS-1).White wire from sensor assembly to PICKUP terminal SW2 (ESS-2).*Rotation as viewed from flywheel end of engine.