I'm changing my oil yesterday in the '94 wagon and taking the cap to the filter off and I'm spinning the cap with the socket and extension which then falls into the engine area. I can see it and reach down to grab it and it arcs out really bad! I thought it would start a fire! I reach down again and touch it and it arcs out again badly. I look closely and see it is wedged against the positive pole of the starter and every time I move the extension it shorts to ground against the engine! I finally disconnect the battery and get the socket and extension out but now my dash lights are out but the fuse is still good. Any thoughts? Is there a second fuse box somewhere? The socket took some major heat and melted one side! Live and learn right?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles