I had my Abbey 214gts 1991 fully serviced in May this year, inc. all electrics. also had new 85amp leisure batt. fitted. I used the van 3 or 4 times during this season,always on "hook up sites". I also bought a new SELMAR 5led battery charger to use on the new battery. having removed the battery for the winter, I placed it on charge and the SELMAR would not function. Returned the battery to my service man, having been informed by SELMAR it could be a faulty battery. On checking the battery, it was flat. the battery was put on a heavy duty charger, but would not hold a charge. The SELMAR was tried on my car battery and found to work perfectly. The onboard charger has 2 10amp fuses, these were ok. but a third fuse )0.8amp had blown. Questions,1 what may have blown this fuse,2 if a new fuse is fitted, and blows,would it be prudent to pay £100 approx for a much more modern battery charger. Would be grateful for any help or advice.