I went to airport to go flying pulled RV6 out for start up started up the engine and looked at gauges and my GRT efis had #1 cyl at 2180 others normal then I noticed smoke coming from my GPS and it went dark reached over and flipped off master looked back and everything still hot so I flipped master again and again still hot would not cut off now starting to get nervous.So another few seconds went by and the 2 amp breaker for the LED under the brow lights breaker pops and master shuts off.Wow what the heck just happened I tried to KIS my panel and wired every thing from buss bar to breaker then toggle switch and the panel lights toggle was not even on but the breaker popped. The master solenoid is insulated type with one post that vans sells and master toggle is ground to airframe behind panel and closing toggle grounds solenoid to make up circuit.Got a new GPS went back checked everything out and started engine everything normal.Ordered new solenoid will install before flight.Any idea why or how solenoid could ground out like that.
Bob
Bob