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I would say that you are on the right path that your issues were created from incorrect wiring. Getting the bottom alternator (12v) checked out at an alternator shop or an auto parts store would be a good start as wiring issues may have let the magic smoke out. As suggested following the Plan...

First things first are some links: M1010 Color Coded Diagram Fuse Box Layout Second: Is the lower alternator a 12v one? I can't read the numbers on it Third: The fuse panel should have 12v except for one that is labeled #12 28v Fourth: The 12v bus is IMG_1535 and the 24v bus is IMG_1537...

The electrical panel in the rear is 24v and fed from the bus bar on the firewall. If stock there would also be 24v to the resister for the glow plugs and 24v to the starter. The DUVAC on the M1010 complicates the situation of the wiring for the alternators but can be resolved fairly easily with...

You probably should start with a few pics under the hood... the 12v bus which only has two connections is on the firewall by the master cylinder.