I'm new to tractors and new to the board, I was just referred here by the good folks at YTMag forums. I've owned about 90 cars and always done all my own work but I'm a lot more mechanical than electrical...
I have a Cub Lo-Boy that I bought from a friend, it ran last fall when he parked it but wouldn't start this spring. He tinkered for a while, ran short on time, and I took over. I will try to make this short and sweet. I have a manual and a schematic that I have been working with, I've spent a lot of time testing voltage, cleaning connections, and swapping parts, and occasionally drinking a beer and just looking at it (like that would help

The tractor will not start. Not a click, not a single noise. What it seems to come down to is that there is no voltage from the outbound side of the starter relay to the generator/motor. I have voltage inbound to the center of the relay via the clutch and PTO safety switch circuits when the key is turned. I have voltage inbound to the relay from the positive cable of the battery (12v+ to each of the above). However, nothing goes out to the generator via the heavy gauge cable on the "other" side of the relay. >I have cleaned and checked all grounds, took an abrasive wheel to the paint under the relay to be sure of the ground on that.
>I have swapped out the relay itself with two others, no change.
> All meter work is done using the grounding stud on the tractor frame rather than the battery post.
> The engine turns well with a breaker bar on the crank pully bolt so it's not locked up.
It has been recommended to recharge the battery and use a set of jumper cables from a fully charged battery to a frame ground and the A terminal on the generator to bypass the switch. I plan on trying this a little later today as soon as it dries out a little, we had rain and it's pretty wet out there.
It seems to my mechanical mind that there is no return path for current flow from the generator and that's why I can't get current out there.
I'm wide open to suggestions and abuse. I'm getting plenty of those from my wife as to why I'm spending so much time out there and none inside with her and the kids so I'd like to solve this ASAP.
I can take photos if it will help and I'll answer any questions best I can. This seems like a very simple machine so it must be something really simple keeping it from even clicking when I turn the key.
Thanks in advance.