rickwellman,
If you have the same controller (or similar) I have in my GBM, you CANNOT adjust the sensitivity without knowing A LOT about electronics. It's built into the slide-out controller module.
That said, IF that's what is happening, then you have other issues.
Our main slide goes out easier than it comes in. To come in, it must first lift itself UP and THEN come in. So running the engine gives it some extra oomph. If you're having problems with it going out, then I think you're having a low voltage problem or a mechanical alignment/friction issue.
A poor ground/power connection adds electrical resistance to the current path feeding the motor. This means less voltage to the motor, making it work "harder" (it actually draws more current due to reduced back emf) to try to turn, thus possibly tripping the over-current circuit. By the way, this is also why this can happen if your batteries are not fully functional. So as was mentioned earlier, check the condition of your batteries.
I will re-ask my questions. How many slides do you have? If it's more than one, are both slides exhibiting this behavior or just one? The main slide on our rig definitely has to work harder than the smaller bedroom slide.
Do you only have the problem when extending the slide, or does it act up upon retraction too? If the latter, does running the engine help?
If you do have more than one slide and only one is acting up, you might be able to either swap slide-out controllers (if single-slide controllers are used...probably not) or jumper/swap wires from front to rear slide at the slideout controller to get it to work temporarily.
Oh, I just remembered, my slide out controller module looked like it was soldered by a 5 year old. I had a cold solder joint issue about 4 years into ownership, plus one of the controller relays developed a problem. (Probably a result of the poor ground issue I had corrected previously, which caused higher current than the 15A relay contacts were rated for.) I replaced the relay and resoldered the entire board. No controller board issues since then. So that might be something else to look into if you're handy with a soldering iron.
Another thing I've noticed. When extending/retracting my slides, I always have a window cracked open to provide for air to enter/escape as the interior volume of the motorhome changes. It's a minor thing, but it does seem to help on my rig. I guess it's related to how many "air leaks" you have in your motorhome. For ours, it helps. Also, I make sure to lubricate the slide seals every year and wax the sides of the slide and that helps the slide come in and out. I've never lubricated the slide gear mechanism. But lubricating the seals and waxing the sides seems to help on the main slide especially.
Hmmmm...I'm beginning the feel like I could write a book on mid-2000's GBM slide mechanisms! LOL
Good Luck,
~Rick
2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (27-Angel since 2008), 1 girl (22), 2 boys (23 & 20).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.