Crate Training a 14 year old Maine Coon

It is not called crate training, but in worst case scenario, yes, it is done.
Have the litter box filled with Cat Attract Cat litter.
Something Else: The kitty should not be let out of the room until he urinates consistently on the box for at least a month or so. Then you add one room at a time as long as he keeps the litterbox usage consistent.

Have you taken your boy to the vet? He should have a full senior panel done, as urinating out of the box can be a sign of diseases common in senior such as Thyroid Disease; and he should definitely have his urine checked for an UTI, even if you took him to the vet for a general exam.

Please start by doing that.... Rule out medical problems first. Cats do NOT like peeing outside of the box... there is almost always a reason for it.

I've actually never heard of feline crate training. Can you tell me where you found information on this?
I am confused at how keeping a cat in one room part of the time would help with marking issues?

If you have ruled out physical problems (UTI) then it is a behavior issue. I would not actually crate the cat, but would limit his time roaming around in the house. I'd set up a room for him to live in and then when you are there, give him supervised time outside.

You could also try the cat stud pants for him to wear. Breeders confine their breeding males because of marking and many of them either live in floor to ceiling large cages or in a room with a washable surface.

I've never heard of crate training a cat, although as goldenkitty mentioned, there are cases where purebreds used for breeding are caged.

Honestly, I know of 1 person who confined their cat to a very large bathroom during the day to keep them contained while they were at work. That cat was the most neurotic cat that I've ever met and did everything she could to stay out of that room. There was no comfort in her "crate". Cats are intelligent creatures, and any confinement in a small room without a lot of stimulation isn't good for them. Even if you put him in his "crate" for short periods of time, I wouldn't expect that to correct any litter box issues. What are you doing to make that room a happy spot to pee?

You mentioned that he always goes in the same 3 spots. What did you use to neutralize / eliminate the smell in those spots? Cats will go back to places that smell like urine. His nose can pick up smells that yours cannot. Are those spots really clean? Regular household cleaners, and even professional carpet cleaners cannot get rid of cat urine.

You said that the vet gave him a clean bill of health. What exactly did your vet test with him to make that judgement? I ask because I had a cat with inappropriate peeing issues that took years of various tests to determine that he indeed had a health issue, and once we finally gave him the right treatment, his behavior stopped. He had an auto immune disease that didn't show up in bloodwork, xrays, urinary tests, ultrasounds or biopsies. When his disease finally took a twist, we were able to isolate it.

Cats are usually meticulous, so if an senior cat (cats become seniors at 8 years old) starts to go outside a litter box, it is almost always a health issue. It could be something as simple as having arthritis where it is hard for him to climb in and out of the litter box, to kidney disease, or anything that gives his old body discomfort so he stops his "normal" habits.

I hope the posts above answer your questions... I was also going to ask you about the "Clean bill of health". Was a complete senior panel done? Blood tests? Urine test?
As others said there is no "Crate training" for cats. BUT: In WORST case scenario, and I mean worst, you can do what I described - it is done, and if you buy a bag of Cat Attract Litter, it will be explained in details in there how to do it, by Dr. Elsey. He has many other suggestions, quite helpful little booklet actually.

But to answer your question, no, he doesn't go out of the room at all until he is peeing consistently on the littebox for a little while. Then you add access to room by room, until he has access to the whole house, and is peeing consistently on the litterbox. So start on the first room - say he uses the box consistently for 2 weeks. Then add access to another room. Now he can roam the small room and this new one - maybe a corridor? I am not sure what the setup for your house is. Setup a goal - Kitty pees consistently for a week on the box while roaming on both rooms, add another room. Again give it another week of kitty peeing consistently on the box, and add another room.
Since this is a new house, it will be good for him to be in this small room anyways - make this his new house transition, leaving him there for a couple of weeks. It will be less stressful for him to be there than to be set loose on the new house at once.
Make sure that he has access to 2 boxes. If you have 2 cats, you should have 3 boxes.

Use Cat Attract Litter - it will REALLY help you.
And I know you used Feliway, but please put one in the wall on the room you are keeping him for those two weeks....
Good Luck!

I do hope you can solve this problem. I understand your feelings about mixing a baby and a cat who urinates everywhere. But a 14 year old cat would be hard to part with since you have had him for so long. Good luck.

Great for you for wanting to keep your boy. I like the name you have picked for your son. I have heard it is good to confine your cat for a couple weeks after you move since it helps them adjust and feel safe.
I have moved a lot but my cat is like a happy dog in that nothing bothers her.
Have you tried a feliway diffuser?

I would also suggest adding more litterboxes to the house. My cat Sneakers used to pee outside the box when we first got her, because there was no litterbox on the main floor of the house (just upstairs or downstairs). Once we put in another litterbox on the main floor she used it fine.

Have you researched the stud pants for him to wear. They may work tho it might be a problem getting him used to wearing them.