There's no short. Your Stowaway has LED tailights, and they are not compatible with Sprinters. Exchange them for the old fashioned bulb type and the issue will go away.
I just replaced my old Stowaway, which was trashed by Camping World's wonderful tech's when I had an AC unit replaced, with a new one. They paid for it, and I saw the invoice, and they did not order the LED tail light option, but it came with them anyway. Luckily, I kept the old lights from the damaged Stowaway, and it was an easy fix. Before I swapped them out, mine had the identical symptom, and I thought the same as you. Then I remember when I ordered mine originally reading on their site about LED's not being compatible with MB Sprinters. Sure enough, they were right.
There is now trick to getting them out, just push from the back. But smear a bit of Dawn soap on the inside rubber seal to put the new ones back in from the front.
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2011 Interstate WD/Lounge (since sold).
2020 Leisure Van WonderRTB
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