Head lights that are controlled by DC polarity forward & reverse
can be adapted to Decoders where the forward and reverse
head lamp connections are to # 3 separate terminals.

This BitSwitch reverses the DC output polarity

LGB Engines are an example

[+] positive common and Separate
[-] terminal for head Lights
[-] terminal for reverse Lights
Resistors Included for voltage adjustments

$11.95

This example is for the Lenz Gold Maxi Decoder

This same BitSwitch can be used to convert
Decoders for twin coil turnouts to Bi-Polar