Carbon-di-oxide alarm goes off when running generator

As noted above, you've got a carbon MONoxide detector, and it's going off when you run the generator because the generator makes carbon monoxide and it's getting into the rig.

This is the gas that kills people, and generators have become an important source. And if you have any doubt as to its ability to "rise" into the rig, keep in mind that five people died a couple of years ago when their portable's fumes rose into the rig they were sleeping in. Link.

In that case, the CO detector was disabled...thank your lucky stars that yours is working!

Please don't take any chances- have this thoroughly checked out/repaired before using the genny again.

I think you meant the CO (carbon monixde) detector goes off. This means you have an exhaust leak. It might have been factory installed but it is not a factory generator, so the exhaust pipe might have bends, welds or joints that are leaking. Any mobile RV tech should be able to find and fix it. Wind wouldn't effect it unless the exhaust has been raised to roof level and your fresh air intake is up there - CO is heavier than air. I suspect your CO monitor is near the floor (it should be by code). If it's near a slide out, floor wall joint, etc. they should look at the exhaust near there. I wouldn't expect you will find it so call an expert.

Sorry, went back and looked at the molecular weight and CO is actually lighter than nitrogen or oxygen so it may rise. But have soemone check it out before you suffer.

I can't really help,but you DO need to find out what is causing it!
People die from exhaust fumes!

Sounds like the exhaust from the generator is getting in the trailer. Are windows or vents open ? If so the wind may blow the exhaust in.

You could try getting a piece of conduit or flexible conduit that will fit over the exhaust pipe to extend the exhaust away from the 5th wheel to see if the alarm still goes off. I used a 10 foot long piece of flexible conduit to run the exhaust away from our 5th wheel so we didn't smell it when sitting under the patio awning.

If routing the exhaust didn't work you might want to check the generator box/storage compartment for any possible leaks into the 5th wheel interior.