Quote Originally Posted by 34_40 View Post
Dave, what's connection 3 feeding? Switched?
The way these latching solenoids are set up for battery disconnect is that you use #3 to do a momentary ground to complete the circuit from #2. Terminals 2 and 3 are a direct and always on feed from the battery. What you are doing is just completing the circuit. The through feed is then closed. Hit the switch again, and it will open. This is NOT your everyday $10 buck Ford starter solenoid which is a momentary solenoid. I had a little problem getting my feeble mind around it so wired up a 'bread board' to satisfy my curiosity. That toggle - can be on either side - I just chose to wire that way ----- just because I did

Some reading for you - the final exam is at 0630 someday: Special Solenoid Applications | Cole Hersee - Littelfuse