Dimmer Switch: Testing and Inspection

Component Testing Instructions
Component testing procedures are provided to determine whether a component is good or bad.

Testing information for each component includes a schematic with component terminal locations and step-by-step test procedures. Component terminals are identified by letters or numbers that may be marked on the component or callout if there is no mark on the component.







The component connector MUST BE REMOVED before testing. To test a single circuit within the component, select that circuit under the column TO TEST. If you wish to test the complete component, perform all tests.

Connect the tester to the terminals shown in the second column and operate the component as shown in the third column.























COMPONENT TESTING PROCEDURE (voltage applied)
Disconnect the ohmmeter; connect pin 6 using a fused (10A) jumper to 12V DC power and pin 4 to ground. Measure the voltage between pin 1 and pin 4 while rotating the thumbwell from full illumination to no illumination. If the voltage smoothly decreases from near 12 volts to near 0 volts, the illumination dimmer is okay. If not, replace the main light switch.