Does anyone know if the main plug connector is the same on a 496 ho versus 525 efi? I am trying to figure how much trouble it would be to switch them. Thanks!

Depends on the generation of each. Either one could use a 10 or 14 pin connector depending on the year

https://www.michiganmotorz.com/mercr...r-adapter-plug. Call up Mercury and give them the part number in this link and ask if it will work with a 525 efi. Would be best if you know the year of the motors in question. What pin is on your 496 now?. If its 2006 or later its probably a 14 pin. Great lakes skipper has them for 1/2 the price of Michigan.
https://www.greatlakesskipper.com/me...-10-pin-14-pin


Chris

Are you switching from 496 to 525? If so we used an 14 to 10 pin adapter, I think CP carries them. Problem was a couple gauges did not work, the simple solution to this was to add sending units and run dedicated wires to the gauges. Been a while so I do not recall which ones did not work.

What year boat and what year motor?