The reason i mounted it there is because part of the power commander is under the battery tray, this location was recommended by another member that also mounted the compressor in this location, have an idea that it is the relay, will give it a check tomorrow.
The switch seems to be pretty much sealed, but water could get in the 2 black buttons.
Thanks for the reply
Ernie
Ernie...this is just my opinion, so keep that in mind...but, I would move the PCIII outboard of the stock ECM, with the connector harness "seam" perpendicular to the horizontal plane of the bike. You can velcro/wire tie it to the finned part of the ECM, move a small connector out of the way, and mounte the connector harness just to the right of the PCIII...it's a tight fit, but I've had mine there for over a year now without issue. There is a method to my madness...it is less prone to water intrusion in this location, and if the harness is vertical any water that might get in will drain out. A couple of people here have had water get into the connection between the ECM and the PCIII and caused some intermittant, hard to diagnose problems. Then the compressor can go under the tray. Just food for thought...
I don't think water can get into the switch, unless the little rubber buttons are cracked or split. The most likely culprit is water got into the relay on the compressor, or you just have a bad relay. Give Mac in tech support (I think that's his name) at Legend a call, let him know what's happening...they are great to work with and will send you any parts needed quickly. The relay is simple to pull and replace/check, if the compressor is in hand, or easy to get to. I had a bleed off solenoid go bad, and they replaced it without question, even though it had been more than a year, with a newer, improved version.
Let me know how it turns out!