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You can pull power for those from amost any source to get to that fuse box. Use the same sized wire as that coming out of the fuse. There should be a fuse block under the dash that is going to work or under the hood. If you aren't sure, add a photo of those areas to your post using the paperclip icon and I can direct you further here. All follow ups are included in our fee.
Is it the "Sunvisor Power" fuse?
Not that I know of...........whose chassis is that?
You might want to contact Freightliner Customer Service and ask them for some help with the wiring diagrams for this. I have had a number of customers here tell me that was very productive. Otherwise, I would just rewire that circuit and add an inline fuse and not worry about that one.
That is so the motor can reverse. You should have a ground lead and a hot lead coming off that fuse block. You just need to track the hot lead down and install in inline fuse and get to a good 12 VDC connection to hook it up.
They are all needed..........just that you should have just one hot lead to each switch or that feeds both of them. Don't mess with the test of the wiring. One of those red leads should come down to the power source. See if you can follow it down to that area.
"rest of the wiring....."
No.........there is just one power wire needed and it can service both switches. You are going to have to see which one leaves the switches and goes to the power source. Or contact Freightliner for some diagrams.
If that is what you deem correct here. I gave you the answer, but I just don't think that wiring is something you grasp well. I would just give a mobile tech a call and have them come over and assist you here. This would take about 10 minutes to fix.
I think had you contacted Freightliner Customer Service and gotten the wiring diagrams this would have been much easier. You can ask for a refund here any time you don't feel you got what you paid for.