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Shift Intercept switch location on 1974 Mark Twain with 165 Mercruiser

Working on a 1974 Mark Twain with a 165 Mercruiser for a friend that has no spark. I have traced it back to the shift intercept switch as the potential problem but I can't find where it is on the boat. Can someone tell me where it is or send a picture of it's location?? He doesn't have a manual and the wiring diagram he has does not show the location. He was hoping to get it on the water for the weekend to enjoy the 4th. Thank you.
 
Ayuh,..... Look on the top of the transom inner plate, above the rear motor mounts,.....
 
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