I am replacing the solenoid on my 1992 Moomba Boomerang. I have four posts on the solenoid and there are four wires. I know where the big gauge wire go that connect to the battery and starter. However, i can't figure out what wire go on the other two small posts. The solenoid has one post marked with an "S" and the other with an "I". There is one yellow and red wire coming from what i believe to be the neutral safety switch on the trans. What little post does that wire go on? and what wire am i missing that should go the other post?