Emergency brake light

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Animal Lawyer

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I am having an issue with th emergency v brake light. When the e brake is set does the switch ground the bulb (meaning the positive to the bulb is always hot or does the switch send positive to the bulb (and the socket is always grounded)? When I used a test light to known ground the tester lit up, but the bulb is not lighting. Depending on which way the switch completes the circuit will suggest how to best trace the fault
 

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