>> A 30A diode is HUGE!  These big diodes are all Stud
>> mount types it seems.  This doesn't seem very compatible
>>to mounting to the leads of a motor.

>As close as you can manage though.

At these currents you will also need to make sure that the wires go to the
diode then to the motor. Do not have the diode on a  side spur off the wires
going to the motor. Make sure the wires go to the diode first then the
motor, not the motor then the diode. The stray resistances and inductances
will play havoc and cause little spikes that will be hard to see on any
oscilloscope and will take you back to the havoc you had. :)

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