Model 6210 Maintenance Manual

Section 7.Component Procedures

Electrical Components Switches

Switches

General

Refer to the Electrical Schematics to identify the electrical circuit location of the switch.

Testing/Inspecting Switches

Examine the switch for signs of arcing, overheating, discoloratio n, cracking, or other physical damage. Replace the switch if you see such damage.

1.To test a switch, isolate it from the electrical circuit. Isolate by removing all the connections from the switch. Make sure all wires are labe led and identified to reconnect later.

2.Use an ohmmeter set to a low resistance scale to measure the resistance across the switch. In the closed position, the switch must have a resistance of less than 1 ohm. In an open position, the switch must show a resistance greater than 10 megohms.

Main ON/OFF Switch

A 2-position keyless (rocker) Main ON/OFF switch (SW1) is standard equipment. When in the OFF ( O ) position, battery power to all control functions is interrupted. When in the ON ( | ) position, battery potential is provided to all control functions via the traction amplifier.

Figure 7-66.Main ON/OFF Switch (SW1) - Standard

Main ON/OFF Switch Inspection

1.With the battery plugged in and the Main ON/OFF switch in the ON position, battery voltage B+ must be present on the two terminals of the switch.

2.Test the Main ON/OFF switch with an ohmmeter after disconnecting the battery and removing the wires from the switch terminals.

In the OFF position, the ohmmeter must read greater than 1 megohm, and in the ON position, the ohmmeter must read less than 1 ohm. If not, replace the switch.

Main ON/OFF Switch Removal

1.If equipped with the optional keypad, press the red OFF ( O ) key. Place the Main ON/OFF Switch in the OFF position. Disconnect the battery connector from the truck.

2.Remove the tractor covers.

3.Disconnect the wires from the switch.

4.Remove the Main ON/OFF switch.

Main ON/OFF Switch Installation

1.Install the new Main ON/OFF switch.

2.Connect the wires to the new Main ON/OFF switch terminals.

3.Reconnect the battery connector and verify operation.

4.Install the tractor covers.

Publication: 1146947, Revised: 12 Jan 2017 7-55