I just tested the coil on my 90 300SEL as I am having hard start when warm problems, I think it is fuel related but thought I would test the coil anyway. (see other post ) Between the two terminals it is 2.5 ohms, I thought 3-5 was normal. Also between the terminal and the high tension lead it is 9.5 K ohm or 9500 ohms. Is this within spec? battery is at 12.5V not sure if that makes a difference.

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1987 300 TDT
1990 300 SEL