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Warning light circuit check

Warning light circuit check Ignition switch Live supply from battery Ignition warning light Check where the live connection runs into the warning light bulbholder. Wiring loom Voltage regulator Probe the wiring where it runs from the generator or regulator into the wiring loom. Generator Test the connection where the wire runs from the bulbholder to the generator or voltage regulator.

If the warning light is not working and the bulb hasn't blown you can check the wiring circuit with a test lamp. Turn on the ignition, connect one side of the tester to earth and probe the various parts of the circuit shown here. In all cases the test lamp should light.