We run a large green warning light on the dash for the alternator(red for oil pressure). We connect one side of the bulb to switched ignition-on power and the other side of the bulb to the field connector on the Bosch alternator. This field power supply should get the alternator charging once you exceed abour 1000 RPM. If the alternator fails the warning light will come on. I have seen GM and other alternators start charging themselves withour a field at the 4000 RPM Mike references. Not sure about Bosch. The issue is that with all the vibration and hard shut offs with the master switch, you could damage a diode or something else on an alternator. In some cases just the voltage regulator may need replacement. I would suggest that having a field connection is the safe setup. Also, the warning light setup is worth while because you will know what is going wrong if the motor starts acting up while on track.
Tom Broring
Wash DC Region
ITA Nissan Sentra SER
HP Triumph Spitfire
HP VW Rabbit
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