Mercedes have some relays that act like fuses. K40 and OVP (over voltage protection) relays are two of them your car may have. A bigger problem would be if the jump damaged the top controller.
I would not jump my SL. Charging a disconnected battery is a better. If must jump, turn the assisting car off before jumping.

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Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012