I was going to mention that the 6 volt fords were positive ground, then i opened the pic saw the 260/289 and knew then he needed the 12 v---got a little farther and Randy had pointed that out---

if you hook a remote starter switch across the 2 big terminals on the solenoid with a dead short you will kill your remote switch---a quicker simpler way is to use the handles on a pair of pliers to MOMENTARILY jump across the terminals---there will be a spark when you break contact---