Viper Boss Seat Wiring Help Please!

[snowbikekits.com]

My seat has power to the tail light but when I hit the brake the led goes black. I checked power at the oem plug and the tail light has 12.xx volts but when I hit the brake lever the power from the brake is at -12.xx volts and the tailight goes to zero?

Any ideas?

Thanks,

xsivhp

 

[snowbikekits.com]

Also - I have the LED light that was supplied by Boss.