Hi Eric and Mr RB
The Chevy will be running 2160 rpm. The alternator is a 22kva tractor driven alternator so needs to run at 540 rpm I have to gear down the motor.
I have a 125 mm 5 belt pulley mounted to the fly wheel of the Chevy and a 500mm 5 belt pulley on the input shaft of the alternator.
Eric I can get a probe to pick up off the ring gear of the flywheel. Or the W terminal of the 12v engine alternator, or the (-) negative of the engine coil where your rev counter usually picks up from.
When I switch over from mains power to wood power, I have to switch over everything, so it will power my house with computers, tv, fridges, washing machines etc so I have had problems in the past when when the alternator goes to far of frequency it fries the motherboard in the fridge!
Thanks guys
Hopefully I will have wood power by next week, the pulleys arrived yesterday with out any keys! So now waiting for keys!