Joe: I'm no expert on this but when towing my Tahoe the manual said to pull certain fuses out of it before towing. I tried that, only to have a dead battery after towing. I next put a battery switch to disconnect the negative side of the battery. At the end of the trip, I had a dead battery. I changed the battery disconnect switch to the positive side and no dead battery after towing. I don't know what happens, but I like the results. I'm sure Jon or one of the electrical experts will solve this one.