?[b:654c4848f0][i:654c4848f0]<font color="#6699ff">What is the "D" position for anyway?[/i:654c4848f0][/b:654c4848f0]</font>?
Take a look at the [b:654c4848f0]SWITCHES AND LIGHTER[/b:654c4848f0] diagram below.
Note the switch (Key 8) AM 1866 T.
Since this is the same switch installed on the Model 40S, then some of the information and photos provided below will be of the Model 40S.
Take a look at the description below of the [b:654c4848f0]IGNITION-LIGHT SWITCH[/b:654c4848f0] topic.
Note the last sentence in the third paragraph states ?[b:654c4848f0][i:654c4848f0]The ?D? position is for ignition, dim front lights and red rear light.[/i:654c4848f0][/b:654c4848f0]?
Take a look at the [b:654c4848f0]Lamps and Ignition Wiring[/b:654c4848f0] diagram below.
Note the RED wire from the TAIL LIGHT terminal on the ignition switch to the rear light.
Also Note the BLACK or GREEN wire from the FLOOD LIGHTS terminal on the ignition switch to the rear light.
Take a look at the photo below of the ignition switch terminals.
?[b:654c4848f0][i:654c4848f0]<font color="#6699ff">On the 430S When I switch the ignition switch to "D", which is the farthest right position on the switch, the tractor dies as if it were intentionally turned off.[/i:654c4848f0][/b:654c4848f0]</font>?
You might consider checking the terminals on the ignition switch, wiring to the head lights and tail light, and connections on the head lights and tail light.
You might also consider using a test light to ensure current from each ignition switch terminal to the head lights and tail light.
Hope this helps.