One small correction to Jim B's note about the fuel filters on the SE/SEL/SEC's, Gen I's have one filter and one fuel pump. Gen II's have One fuel filter and two Fuel Pumps.

I am guessing that maybe the battery cables were not removed and possibly the two or 4 Fuel pump wires may have shorted.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.