Just a note. The schematic in post 11 is for the R9 OD. No idea if Hudson used B-W or if so, both versions but they are quite different units. If you are installing the R11, electrical is much simplified. There is a description of the overall OD operation and a schematic in Service Counselor Vol 23 #2.
https://www.packardinfo.com/xoops/html/downloads/SC/SC-VOL23NO2.pdf The layout as given in the R9 diagram above is generally correct but a few items are no longer used or on different sides. If you check the 23rd series wiring diagram, it will have a pictoral layout similar to the one above for the R11. Just ignore the Electromatic clutch info.
The R11 was made available as a kit for install in cars having the R9 (which included 47's) so that installation procedure might be of some help in where to position new items. SC Vol 23 #4 has some details of the kit and mentions a few other things that was needed to complete the install on an existing OD car.
Since there are other things involved besides just the OD unit, you might need to go thru the parts manual and figure out what else is different between an OD and non OD car in the way of mounts and brackets. Some you can make or possibly repurpose the originals but others you may need to source before you start.
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