The resistor mod works OK if you just turn on the lights, but as soon as you turn the radio on (with ignition on of course) the LED's & display come on at full brightness again. It's as if the input from the red wire (IGN switch), & the white wire (dash lights) are "ORed" together to drive the display. so which ever wire has the highest voltage on it will be connected to the display. Only solution I can think of is to open up the radio, & trace the circuit back from the illumination, & change the way it works so that the white wire ON disables the illumination feed from the red wire. By the way, if the display goes off completely, you will need to replace the white LED's under the display (just done mine)
Bob Le Brocq (electronic engineer), April 2012
