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I was actually thinking of fitting a bigger alternator, reasoning is this:
A lot of the loss in an alternator is the fan and the iron loss, both are speed dependant. if I use a 24V 150A alternator at less than 1/2 speed it should work for 12V if the regulator is changed for a 12V one, and losses should be much less. it would run well below it's rated current so it should stay cool with the lower fan speed too.
I have been thinking of a way to turn it off without disconnecting it, if the warning light wire is raized in voltage to around 17V the regulator will think that is the battery voltage and turn off completely, we can do this with a 6V battery, connect the -ve side to the main battery +ve and the +ve of the 6V one to the warning light. warning light will come on, and alternator shoulf turn off. there are some cars with different connections, probably won't work for those.
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