My Force 70 requires a "Make Before Break" switch to avoid blowing the rectifier when changing positions. Can you recommend one at a reasonable price and how can you test the functionality with a DMM?
They sell them right here on iboats! Popular brands are Perko, Guest & Blue Sea Systems. If you have one you are pondering changing you could look the model number up online to verify if it was a make-before-break, otherwise if you want to test it with a multi-meter you should be able to check continuity from position #1 to position #2... Turn the switch slowly and it should show continuity between the two posts for a second as you go from position 1 to 2 and vice versa... If you have a DMM with an audible continuity alarm it will make your job a little easier.
Looking up the switch is probably the fastest way!
Battery Switches from Iboats