From Kuryakyn :
CAN BUS SYSTEM MODELS: IMPORTANT: Load equalizers are NOT necessary on CAN bus systems when LED Turn Signal Inserts are installed. STEP 6 Start the bike and check for proper turn signal operation. If the turn signals flash rapidly on CAN bus system bikes, you will need to synchronize the turn signal system. Follow the procedure below to synchronize: BRAKE-SIDE (RIGHT) HAZARD (4 WAYS) BUTTON ON HAND CONTROLS = CAN BUS SYSTEM Turn the ignition ON, Turn on the 4-way flashers for at least 20 seconds; shut the 4-way flashers off, Turn the ignition OFF, Turn the ignition back ON; check for proper turn signal operation, You may need to repeat the procedure if the signals still flash rapidly. NOTE: -cont.- Diagnostic Trouble Codes (DTC) may be triggered during initial startup when using LED Turn Signal Inserts. To clear the DTCs, follow the procedure on PAGE 3.