s500 sparking problems please help!!!!!

hi im a newby to the site and boy am i glad i found it. i have a 95 s500 which was running sweet one minute-and then after pulling
in for petrol and restarting it was only running on four cylinders! so far ive changed all the plugs leads, checked the distributors and rotary arms and all is ok and still there is no life coming from the new coilpack which has two wires going in to it one 8mm and one 10mm securing the wires? does anybody know where these two wires go?? because i strongly believe this is the root of my problem. any help would be a godsend! cheers
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