Model RM 2811 Dometic refrigerator. Model RM 2811 Dometic refrigerator for lp-gas and electric

Question

Model RM 2811 Dometic refrigerator for lp-gas and electric operation: problem is that the control pannel switches rendomly from auto AC to Gas and I want it to operate on AC only.trailer os located near the sea shore and I think that corrosion may be the problem. there is 15vdc at the control panel and 115 vac , however I don't know how much current is required to operate the relay properly.