68 M715 230 stock, New batteries month old. I go to start it and with in 10 seconds truck sounds dead. Not firing I don't understand the points and what they do. I'm thinking I have some kind of spark issue. Changed the rear main last weekend. Drove it yesterday ran and started fine. Batteries were showing 10.8 and 12.9 volts after driving it for a few hours, they evened out after I shut it off to 12.4. The ? is why are the batteries so off voltage wise. the 10.8 one was closest to the kill switch. Need some advice or expertise.