Beth, are you asking about the roof/ceiling wiring?
In general you won't find this online. You may be able to contact Winnebago directly and receive such a wiring diagram. I don't know the extent of their info on coaches of your age.
But there are not tons of wires in the roof and usually if you get on the roof you can see where things are mounted there and get an idea of the wiring needed to supply those items.
It may also be possible to just use an existing opening. For instance, on a Class C I used to own I removed the TV antenna mounting plate and ran my cell booster antenna wire in through that hole and then I reinstalled the antenna.
On a Class C the front of the roof is pretty clear, but a side location, say right over the RV body entry door if there is a cabinet there, is a great location for mounting a cell booster.
Another popular existing opening is the Fridge vent on top of the RV. The only problem with this large opening is it can be difficult to get access to the cabinets beside the fridge without partially removing the fridge. But sometimes that isn't necessary. Every RV is different.
One final location is down beside a plumbing vent. Though those are usually near the bathroom and or kitchen or both.
There are tons of YouTube videos of people drilling holes in their roofs for antenna installs and you may get some ideas there.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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