On an open wire with no spark plug 30,000 used to be the voltage,now 50,000 is not uncommon.But a coil will only put out what it needs,no more no less.
What is strange on wastespark ,coilpack type ignition is that they are a/c current ,not d/c as a person may think.
Rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car