afraid I can't be of much help.. the 124 cars have an OVP (overvoltage relay protector) that has a fuse that can burn out when a vehicle is jumped) you can perform search for more info. trouble is, I don't know if your car has an OVP, so maybe someone else can help you more than I have... sorry

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Nello Tare

1982 300D (266,001 mi.) looking and running great

Previously owned:
1976 450 SLC
1983 300D
1976 300D
also
1982 Jaguar XJ6 (loved, but gone)