HelloIf you happen to have your engine user's manual from new, then the belt routing for your exact model should be in there 'in the maintenance section and ought to be listed in the front table of contents index guide... While not fully able to tell you if routing changed in 2011 or not but the following guides of other engines may help get you where you need to be should you not have your engine operation user manual from new.
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Serpentine Drive Belt; Checking; Replacing Belt And/Or Adjusting Tension - MerCruiser Sterndrive 4.3 MPI User Manual [Page 106]
MerCruiser Sterndrive 4.3 MPI Manual Online: serpentine drive belt, Checking, Replacing Belt And/Or Adjusting Tension. Inspecting The Belts With The Engine Running May Cause Serious Injury Or Death. Turn Off The Engine And Remove The Ignition Key Before Adjusting Tension Or Inspecting...www.manualslib.com
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S/N 0L619084 And Above - Mercury MerCruiser MCM 4.3L ALPHA Service Manual [Page 25]
Mercury MerCruiser MCM 4.3L ALPHA Manual Online: S/N 0L619084 And Above. Alpha With Power Steering Alpha Without Power Steering Index 90-861328--1 NOVEMBER 1999 76503 Bravo With Power Steering 76445 Bravo Without Power Steering MAINTENANCE 76502 76463 Page 1B-25...www.manualslib.com
If this doesn't seem to help, then you could also try searching online 4.3 mpi MerCruiser belt routing diagram as there are many others over the years asking the same question with photos showing theirs too.
It's in the link Fun Times posted, right above the video.... This link ↓↓Just can’t find where the tension nut is on this thing or maybe I need to loosen the alternator?