Do not invest in the clamp-on ampmeter
The clamp-on ampmeter will not mesure DC current. It is only for AC current. I recommend procedure discribed by "Old Deis". Your starting problem will not cause to discharge of the battery. If the starter is not turning than is not using the battery unless has short (observe dimming of the dome light or voltage on the battery).
Roman
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87 300SDL 157K
86 300SDL 212K
86 420SEL 226K
81 300D 147K
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