gbs said: (quoted from post at 22:55:21 11/04/09) had a auto mechanic's teacher in high school that was as good a tractor mechanic as they come,he converted a many a tractor to 12 volts,he warned us about disconnecting the battery while engine was running to see if alt. was charging enuogh to keep engine running,he said that if circuit was disconnected that the regulator sometimes wouldn't control the voltage and it would spike burning up electrical parts,well hard headed me kept doing it any from time to time until i blistered the alt. and coil on my sa ,had to replace them instead of cultivating that morning live and learn.
Yep, alternators/regulators vary and under the right conditions 100 volts + is available. He said he measured alt out put with alt disconnected from battery. That is what I would call a meaningless measurement. Much better to measure highest it raises battery voltage to after a nice long run. If you have all the correct load resistors & test eqmt, it can be done without the long run time, but for most situations just determine where battery settles out after hour or two of operation, voltage wise.
Here is a Delco 10Dn, near full field ........lots of voltage, lots of amps (not a spike, but steady output).
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