I couldn't find it in the service manual I downloaded - and I did a search here but no information on the location.
Just sitting at the desk at work away from the shop - I can check with a multi tonight to see what voltage is but figured on this helpful forum someone might know.
So for future reference if someone comes here
My Satoh 650G does not have a coil resistor. It's 12v straight to the positive post on coil. So the coil I use has a built in resistor.
YMMV - I couldn't find this information in any service manual I downloaded - in spite of jaxs Elite comment .