When you turn on the Electric ONLY switch, The YELLOW wire should now have 12 volts. THAT wire goes to the 120 element 12 volt relay to close it and supply 120 power to the 120 element. IF NOT, then either the RV installed electrical wiring from the inside switch is miswired or your circuit board is defective.
The WHITE wire should have 12 volts when electric switch is ON, IF the control board is good, then the yellow wire should now have 12 volts. IF NOT, your circuit board is bad.The ORANGE wire should have 12 volts when Gas switch is ON. Yes, you can have both gas and 120 on at the same time. Doug
