TURBOCHARGER GP 3619712 - Caterpillar

Illustration 1. Location and positions of Auxiliary Backup Switch Another test to verify the status of the Auxiliary Controller is to observe the indicator lights inside the cab. The indicator lights are located on the cover for the top wiper motor of the front windshield. The location for the indicator lights is shown in Illustration 2.
Illustration 2. Location of Indicator LightsYellow indicator light.Orange indicator light.If the Auxiliary Controller backup switch is in the automatic position, either the yellow indicator light or the orange indicator light will be on to indicate the position of the auxiliary ball valve. When the backup switch is in the manual mode, the Auxiliary Controller is disconnected and the indicator lights are off.Solution:
If the backup switch toggle positions are the reverse from those shown in Illustration 1, the procedure for correcting the backup switch activation would be to switch the two wires to establish the correct activation for the backup mode. Illustration 3 shows the correct wire position for activating the switch.
Illustration 3. Position of wires for activating backup switch.Manual or backup position.Automatic or normal position.Gray (N923-GY) wire.White (191-WH) wire.White (N924-WH) wire.COPYRIGHT 1999 CATERPILLAR ALL RIGHTS RESERVED