What's the electric cow in my boot?

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Spending a fun few hours digging & hand winching the fourtrak out of a snow filled ditch today I kept hearing what can best me described as an electric cow moo from the rear of the vehicle but all the electrics (lights etc.) were off and the ignition key was in my pocket. The noise only lasted a second & wasn't regular so I had no chance to locate it any further but I don't like the idea of something electrical running when the truck is switched off. Any ideas at all as to what it could be? I've got the standard immobiliser (its a '97 TDX) but no alarm.

it was a rover 75 so no help

it was a rover 75 so no help there! it was connected into lighting circuit for a tow bar/caravan charging system.

on tow bar

do you have two trailer plug sockets?

Full of ideas but no time to do them!!

www.bloodredoffroad.com
www.milneroffroad.com
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