I came home from a week's vacation and towed my 16' toyhauler to and from the Sequoia Nat'l Park ... no issues during the entire trip. Guestimating about 5 hours after being home, everything was unpacked and the truck/trailer locked but still hitched ... suddenly the alarm went off ... all by itself! Using the ignition key, I was able to start/stop the 6.0l diesel motor, but the alarm kept going. I pressed the lock/unlock buttons but still the alarm was going off! I repeated this a few times and concluded that only recourse was to disconnect the batteries. That stopped the alarm. While doing the disconnecting, I detected a faint electrical hot, maybe a burn kind of smell but no smoke of any kind.

I'm worrisome about reconnecting the batteries to see if the truck is back to normal ... I will probably just have it towed to a mechanic ... in any event it's going to go somewhere to be looked at this coming Monday.

Wondering if anyone has seen this type of thing before?

 

Sounds like you're getting a short somewhere. Probably wise to leave the batteries disconnected and have it towed somewhere to get it checked out (unless you are comfortable with doing that kind if work).

In the meantime, get a good flashlight and at least look around as much as you can to see if you see any bare or burned wires. If you do, might be an easy fix.