Have you gotten a good look at the shift cable? I can see the remote was disconnected at one point in your photo.
Take a look at THIS THREAD and see if that sparks any ideas.
I had an electric shift which was different than what you have. I'm looking to see if I still have one of my old manuals.
No matter what - nice lookin' boat - get it working right - cheap - etc - the OMC Stringer drive has been obsolete for a long time. They're kind of a cool drive, but definitely should be thought of as an antique. They like attention in the garage, and they can be finicky.
I actually liked mine...
Are you sure the cable is installed correctly in the remote (throttle)? Do you have a picture of the drive and the remote?
If I've read your previous posts correctly, you've never had this boat in the water. Is that right?
I don't see it on the trunion cap on in your photo, but perhaps on the other side is a hose connector?
If not, some of them had a flush kit installed like this photo.
if neither of those two are on the drive, then Scott's right.
Welcome aboard. You're probably spinning your wheels. Marathon was a builder back in the trailer boat days, and they've been gone for quite a while. Boats didn't have a lot of documentation on their builds (typically). Not like a car manual or anything.
You're probably going to do better...
Welcome aboard: it's going to be mostly an internet search. They've been out of business for a while. Generally, boats don't have much of a "manual" that was published by the builder.
Generally speaking the rigging is not specific to the boat (in terms of manufacturer) anyway, so if you post...
Well that's certainly odd.
Any wires capped off under the dash? // There's no other way to do this on the Stringer: the remote doesn't have a switch for the tilt. It's a separate switch at the helm somewhere (unless for some weird reason it's in the stern - which I suppose is possible)...
Socrates is credited with originating a phrase something like "wise people eat to live, not live to eat." Kind of a statement of moderation; and it is used by health advocates all the time. Good chance the "work" statement is a variation of that phrase.
That's an electric shift Stringer. The remote (throttle) has a red lever to run up the RPM in neutral, and then the throttle controller. Tilt is a separate toggle switch somewhere. Do you have any unused "holes" in the dash? Maybe it was removed?
The tilt motor is way at the back of the engine...