
A general tip for owners of campers (or RVs, as they're called in the US): you will not find many service places for campers in Mexico, or anywhere further into Latin America. But: the good news is that boats use very similar (or even the same) components and systems, so if you're having problems with camper specific parts try one of the marinas or boat service places!
We had our electrical system repaired by a boat place in Puebla (Super Aquapestur, Chignahuapan 4a, Ph.958 4418, on the way into town on Recta A Puebla on the left hand side [uphill section / Continental Tires across the road from boat place / trees on median strip / traffic light w. sign Av. Reforma to left] just before you reach La Paz - there's a Pizza place next door with lots of mopeds outside). We recommended their excellent service to a fellow camper at Las Americas, and he had a more complex electrical problem also fixed by the same people to his full satisfaction!