Inspection Of Light Control Rheostat

inspect rheostat operation

Connect the positive (+) lead from the battery to terminal

1. Connect the negative (-) lead to terminal 4.

(a) With the brightness at minimum, check that there is 9V between terminals 1 and 3.

(b) Gradually turn the rheostat toward the brighter side and check that the voltage between terminals 1 and 3 decreases from 9V to OV.

(c) With the brightness at minimum, check that there is OV between terminals 2 and 4 and 12V when brightness is at any other level.

If operation is not as specified, replace the rheostat.

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