Im replacing the starter on my dads 79 Chevy 3/4 truck but i cant get the truck to start now. The starter works good and cranks over the motor but it wont run. On the old starter there was a big post where 3 wire terminals connect to, and then one small post that has an S on it with one wire going to it. Now the new starter has a the 2 posts but also an additional small one that has an R labeled on it. Am i supposed to cut one of the wires somewhere and put onto that post? Please someone help, im running out of daylight to get it fixed. Thanks much.