For us exp pilot/builders: Good thing I switched over to a mechanical master a couple years ago! I used a race car type from Summit Racing, fire wall mounted very close to the floor mounted battery so nice short leads, and a light push rod going up to the panel. I really like, and have used, twice, the ability to un hot all the wiring, when things go south. This was the first long duration and unplanned "test" of the new master, it's about as idiot proof a way as I can think up to eliminate the classic problem. Having an energized coil drawing drawing power, significant power, enough to kill the battery, does not appeal to me anymore.