I filled the fresh water tank with a bleach mixture from an opening next to the side door, below that there's a sticker that says fresh water tank release. When I dump that water, it smells like bleach.
Yep. Fresh water fill on the camp side by the door. Fresh tank dump valve below it/under your trailer.
Trailer plumbing is new to me which is why I am hear, thank you for the help this far.
It's all good - we all like to help. It can be frustrating, and there's a lot of things that are different coach to coach (even year to year).
The port on the back of the trailer not labeled city water or tank flush, goes directly to the T fitting/valve that is connected to the pump. If I have suction on the pump, but not 3 feet up stream at the port that means the medium between the two is leaking air or blocked.
As a lifelong sailor, it's frustrating to have unlabeled features/controls. The guy with the knowledge might not be the guy (attempting) to operate something, or you might have to give instructions to someone to do something. Labels help. I'd consider putting a little label on that port back there, just because.
I believe that you've diagnosed the issue properly, I think you're on the way to a good solution.
I am assuming a short hose/whip gets hooked up to that port to vacuum in either water from a third source for instance a 5 gallon water jug or to winterize by pulling in antifreeze? I see no other way to get antifreeze in there.
Yep, you got it. I buy the gallon jugs of the 100° stuff from walmart. It takes just ~2 gallons run all the lines in a full sized roo. To accommodate my antifreeze fill hose (which is a short length of garden hose), I cut the tops/handles off of my antifreeze gallons (need 2 to winterize), and dip the hose end into it - other end (as you correctly surmise) hooks up to your 'mystery' port. Switch that T in your plumbing photo and you'll draw from your antifreeze port, not the fresh tank. Flip on your pump and it will draw antifreeze into the system. When the first gallon gets empty, switch to the second gallon and bob's your uncle.
Note that you've got that 'clear tank' next to the pump in your wet bay. That's actually a filter housing. Several folks have deleted that filter (it's hard to get at, filters are expensive, and it's a place for leaks) and have opted to us an inline '
blue torpedo' style filter, whether they are hooked up to city water, or using that filter when they fill their fresh tank.
I actually like to run a filter in the housing, the OEM is the (somewhat pricey)
FRE-10-GN from Forest River Electronics. that fits the
FRE-10-H filter housing (which I believe is what's on your 23ikss - better double check, there's a label on it). For the somewhat budget conscious (that's me), Neo-Pure makes an
aftermarket filter that replaces the FRE-10-GN.
A note that many of these filters have the same 10" body, but a different specific size interfact (the 'nipple' on the filter fits the top of the filter housing). It's another means of price and product control, so I'm not that in favor of it... but it does a good job for filtration. Your mileage may vary.
Just my .02, hope this helps.