The following diagram shows how the 2007 KTM 950 Adventure Electric Starter System and works. Battery voltage travels from the battery through the ignition lock, fuse and the emergency OFF switch to the coil of the auxiliary starter relay. The ground supply to the coil of the auxiliary starter relay takes place if at least one of the following conditions are met: Transmission is shifted to neutral (neutral switch 6 is closed, current can flow through diode and the neutral switch against the ground) and Clutch is pulled (clutch switch is closed, the current can flow through the clutch switch against the ground).

When the tip switch is actuated, battery voltage flows through the closed load contact of the auxiliary start relay to the coil of the start relay and from there against the ground. This causes the load contact on the start relay to close and battery voltage to flow via the start relay contact to the starter engine. The diode is one of the electric starter system’s important safety features which prevents the starter engine from being actuated although a gear is engaged and the clutch is not pulled. The diode does not allow current to flow when the side stand is folded down, in other words, the auxiliary starter relay will not have a ground connection via the side stand switch.

If the clutch is released with the engine running and a gear engaged although the side stand is folded down (driving off with the side stand folded down) the ECU will not have a ground connection through the pink cable, the voltage will increase to over 2.5 volts and the ECU will break the ignition, immediately causing the engine  to stall. An alarm system (accessory) can be connected to the BA/BF connectors. The two connectors must be connected together if no alarm system is installed.

KTM 950 Adventure Electric Starter System Circuit

2007 KTM 950 Adventure Electric Starter System Circuit and Legend:

1. Battery
2. Ignition lock
3. Fuse
4. OFF switch
5. Auxiliary starter relay
6. Neutral switch
7. Diode

8. Clutch switch
9. Tip switch
10. Start relay
11. Starter engine
12. Diode
13. BA/BF connectors



Related Post

1964 Ford Truck F-100 Wiring Diagrams
Yamaha YZFR6XC Electrical Wiring Diagram (2008)
A Typical Water Temperature Sensor Circuit Diagram in a Motorcycle Engine Cooling System
Electronic Spark Control Knock Sensor Circuit Diagram
TGB Blade 250 Starting System Circuit