Seller notes

Roadmaster 789 LIGHT ACCESSORIES SKU: R6L789 Brand: Roadmaster Condition: New Warranty: Manufacturers Warranty Part Number: 789 Diodes are used to prevent the backflow of current to the electrical systems of the towed vehicle and RV. Without them, back feed can destroy the computer module in either rig. Some newer towed vehicles use a multiplex wiring system, whereby multiple electrical signals may be sent down a single wire (brake and taillights, for example). The signals only vary by voltage. ...

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