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Pretty much lines up with what you guys were saying. But, we’re going to to pull the electric schematics to try to make better sense of it all. IMG_2524.MOV

Thank you guys! I’m going by what my confused mechanic is telling me, so I’m going to go check it out for myself tomorrow.

Boost pump went out on my 94 M20J MSE. Had a JPI 730, Garmin 430 and a couple of other small upgrades installed a few years back. Pulled the Aux CB to remove power to the pump and all my avionics came on with all the rocker switches in the off position. Scratching our heads...