According to TRA's 4 & 4A Judging Standards, both cables should be the "helmet" or lead cap connectors at the battery. The ground cable is a round steel woven cable with no sheathing and connected to the body at a verticle section above and slightly left of center of the battery. The solenoid lead (negative for the 4 and positive for the 4A) should be black plastic sheathed with a rubber boot at the solenoid.
Lou Metelko
Auburn, Indiana
TRA in Fort Wayne, Indiana in 2011