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I have been experiencing headlight/taillight bulb burnouts. I tested the AC voltage at the headlight socket and found that it surged above 15 volts. Since bulb burnout is commonly a result of a defective voltage regulator I pulled what I believe is the voltage regulator from under the engine (1st picture of connector location under engine attached and four yellow wires and one red wire in connector). My sled has electric start (battery). The voltage regulator is made by Tympanium (2nd picture attached). The Tympanium unit has three wires (yellow, red and green) (3rd picture attached). So, the first question is: Is this Tympanium unit just a voltage regulator or is it a combo unit voltage regulator and rectifier (to charge the battery with DC)? The second question is: What is the function of each of the three colored wires? Note: The shop manual states that the AC ground is a separate circuit from the DC negative ground circuit.
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