The C10, aka Kawasaki Concours - The Original > Accessories and Modifications - C10

Freewheel Starter Relay

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berna1201:
A freewheel diode or non-return diode, is placed with a polarity inverted to that of the power supply and in parallel to the inductance coil of the relay. The use of a diode in a relay circuit prevents the appearance of huge voltage peaks when the power is cut off.

Following a discussion on freewheel relays, he raises questions about why the solders of the mini relays, especially the starter, the fuse boxes of GTR 1000, and certainly other motorcycles, had an unfortunate tendency to break.

When you press the start button, it activates the mini relay and this one, the power relay that sends current to the starter, it is then created in the coil a powerful inductor current.

Which, when you stop pressing the button it changes the polarity of the coil and the current goes up until it finds a weakness, and in our case, it is often the welds that toast, see the mini relays, that take each time these blows of cutting. 

With a diode, the reverse overvoltage "turns in circles" in the coil until disappearing by heating in the coil.

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