The majority of 12V problems are the result of a poor or missing ground. I suspect non-use has allowed corrosion to create a poor ground, which allows the doorbell to receive power from a backfeed.
The biggest problem will be locating the poor ground point. It may resolve itself with frequent use, as 12V burns it's way through the corrosion.
This is like shaking a flashlight to get the batteries to power the bulb, but we cannot shake a MH like a flashlight to disturb corrosion.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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