I am converting my turn signal/parking lights from dual filament bulbs to single filament bulbs. This is a common conversion on motorcycles, hotrods, etc. I am using a 3 wire to 2 wire converter(see attached pic). The turn signal comes into the circuit(red wire) through a 1N4001 diode. The park light signal comes in the circuit(grey wire) through a 27 Ω resistor and a 1N4001 diode in parallel to the turn signal. The two wires are joined at a common output(black wire) the goes to the positive lead of the turn/park signal and the negative lead is attached to a ground wire. When I apply 12VDC to the circuit, the parking light does not light and the resistor gets very hot. When I turn on the turn signal, the light flashes as normal and the resistor returns to normal temp. Or, if I start with the turn signal on, the light works as required and the resistor remains cool until I turn off the turn signal. All readings are as expected on the components. I am stumped!!!