Towing lights issue

Thank you all for your thoughts and suggestions. Very helpful. There is no power to the turn signals, brake lights and running lights. I had assumed that the 7 pin was factory installed by Workhorse but the owners manual does not provide any details about towing wiring / fuses. It does however provide thourough information on all fuse blocks and panels. Now i'm beginning to think that the 7 pin was installed by Winnebago. I do have the Winnebago 12 Volt system manuals so I'll take a look. I'll also do further testing with my multimeter. 

I'll let you know what i find....

One other item that I should note. The 7 pin connector doesn’t have separate fuses for the towing lights. For instance, if the right turn signal on the vehicle works, the right turn signal post in the 7 pin connector should also work - they are protected by the same fuse. Same with all the other “towing” lights. This may not necessarily be true for all vehicles, but to the best of my knowledge this is generally true; exceptions could exist especially if this is an after market 7 pin setup.

do you have the owners manual, it should show a diagram and everything the fuse powers.  

it generaly it is 30 or 40 amp in the main distrubuion fuse block under the hood.  it should be in the chassis manual.  

untill you figure that out, you could be waisting your time jumping to other issues.  the basice rule for trouble shooting is eliminate the easy stupid things first.  that is generaly fast and simple, but when you run into road blocks like you just did, they are a good thing to figure out so if you have an issue next time you know where to start looking right away.  

I gotta agree with both of you to an extent. I don’t have the fuse box memorized on a whatever rv that is and neither do the rest of us. 
But I agree, more info needed. Typical reply to most “help me” posts. 
Also not all lights on the same circuit so unless multiple fuses simultaneously then I wouldn’t start there if the whole plug is dead. 
Most likely if worked yesterday, all dead today scenario (again, very sparse info provided) I’d be looking at the grounding. 
Is 7pin grounded to chassi or pass thru to trailer. Is trailer ground connection(s) good?  Is the ball grounding good to the tongue (or too full of rust or grease to make a reliable connection)?

OP needs a test light and or a multimeter and a basic understanding to 1.  Provide more info. And 2. Actually use the tools and suggestions to diagnose. 

The 7 pin connector has, you guessed it, 7 pins. What pins are functioning the way they should be and what pins aren’t. You need to know the function each pin provides and whether or not each is functioning correctly in order for us to help you diagnose the problem, and tell you where to look for the proper fuse to check (if that is indeed indicated as a likely problem. No Power to me indicates nothing is working, that wouldn’t likely be a fuse issue.