2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 284Get this manual
Chassis Electrical System Ignition Relay Power Circuit
When the ignition relay is closed by the ECU, fuse-protected battery voltage is supplied to the ECU and each ignition coil via the REDWHT circuitAn ignition diode is installed on the REDWHT circuit to prevent voltage back-feeding during ignition power-up and shut-down