On November 8, 2019 at 10:49, GotGame said...
Oh. that made my day.
451M has everything neat in one box. Depending one what ford did in that E350. I don't ever recall working on one. Some other vehicles were just neg trigger to the factory relays.
The negatively triggered locks were great- very easy to connect.
Ford used polarity toggling, but with master and slave switches. Two wires for lock, two wires for unlock- as I remember, it required two relays with tab 30 going to the locks and 87a connected to the master switch side. Tab 87 connected to a 12V source.