On a recent trip from Nebraska to Denver Colorado in January in my 2004 Monaco Diplomat the following events happed. I have had this coach for 4 years and with regular up keep it is almost "bullet proof". Conditions were cold, 15 degrees, wind blowing and light snow. With the generator off and inverting for AC we had the TV on in the back and the gas furnace (front and back) keeping us warm and cozy. All of a sudden the TV quit working and my family in the back were complaining about the cold. I pulled off at a rest stop and checked the information panel by the back bath. The inverter had faulted due to low voltage and the house batteries were reading 9.2 volts. The alternator on the engine was working fine but it was not charging the house batteries.Plan "A" was to start the generator and charge the batteries. Also remember, It was cold because the gas furnace fans run off of the house batteries. Oh, by the way the fridge quit working because it needs 12 volts from the house battery to control the system. Well guess what! The house batteries are used to start the generator, after two slow rotations on the generator starter it was clear it would not start. Next thought, use the emergency start switch to pair the House and chassis batteries. Sorry, won't work, they only pair to assist the chassis batteries and will not assist the house batteries to start the generator. After a call to my Tech man "Larry" at Leach Camper in Lincoln Nebraska, (they are great) it was determined that a relay between the chassis and house batteries had failed. Not good news at 4:00 pm on Saturday, 300 miles from home and 15 degrees outside. The engine heater had no chance of keeping up. Temp about 50 degrees in side now. That's when I had an idea, the batteries for the house and chassis sit right next to each other. Why not use jumper cables to start the generator for AC and charge the batteries for the gas furnace? Oh, wait, I never thought I would need jumper cables with all of these batteries and gadgets.Next stop was Flying J for a set of jumper cables. Hooked the cables to the house and chassis batteries and Presto-Change-O the generator fired right up. Wasn't long and all systems were up and running, we had Heat and AC.
Leach camper replaced the relay with a heavy duty one and everything works fine. I will always have a set of jumper cables with me.