Diodes are used to prevent the backflow of current to the electrical systems of the towed vehicle and RV. Without them, backfeed 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. This is why Roadmaster often refers to these vehicles as having variable voltage lighting. If an ordinary diode is used in these applications, some taillight signals will not work. That's because the motorhome only sends 12 volt signals, but the towed car is expecting different voltages for different taillight functions. Smart Diodes receive the full 12 volts from the motorhome and modify the voltage in order to light up the correct taillight signals on the towed vehicle.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov