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You don't say what type of RV you have, so my answer is generic. Most RVs have two battery systems, "house battery" for living amenities (fridge, interior lights, furnace, water pump, etc.) and a second "chassis battery" for driving functions (engine start, exterior lights, wipers, etc.) Ground connections are generally the same, the positive terminal is never cross-connected between the two battery systems except when a charging voltage is detected.
If you have more than one switch to turn the pump on/off, it most likely has a multiplex electric controller. This may be bad and need replacing. The water heater should have a fuse in house fuse panel so check it. If the fuse is good, then check for 12v in at the water heater.
All water flow is pushed by the water pump unless you are connected to a hydrant with a drinking water safe hose. Make sure all valves are set for water flow from the proper source. The water pump has a switch or two in the RV, usually near sinks or toilet. If the switch is on and no pump sound, check the fuse at the house 12v fuse panel (interior lights, furnace, refrigerator, etc.) If the fuse is O.K., it's either the pump or the pump controller. Amazon com Intellitec 00 00145 100 WATER PUMP CONTROLLER 10A Automotive
Test the pump by hooking it directly to 12v supply or use a test light to see if power is available at pump wires.
Pull bottom plug out of hot water heater tank let all water drain. Then open all water tank drain valves and be sure your RV is tilted so it will drain towards the valve. Go in RV access water heater valves put it in bypass so no antifreeze can enter water heater tank. Pump RV antifreeze with hose provided into all water lines throughout RV by turning on your main water pump after you have stuck the bypass hose in a new and full antifreeze bottle, then flush toilet until red antifreeze comes out. Open all faucets one at a time until red antifreeze comes out. I use 3 gal but some only use one, the more the better it’s cheap at Walmart. Don’t forget to run outside shower until red antifreeze comes out also, very important or it will crack in the cold. Finally make sure black and grey tanks are empty and flushed at your last camp trip before winterizing. Pour antifreeze in toilet and all drains making sure first that black and grey tank shut off valves are pushed in and closed. Get a quality cover and store RV, it makes a huge difference on protecting roof and roofs lap sealant! All RV antifreeze is non toxic and you just drain it all at your first camp stop after winter! Note: don’t forget to put water heater ionizer drain plug back in wrapped with new white Teflon tape and take water heater valves out of bypass! Draw a diagram of regular mode and winter bypass mode so you don’t forget especially hot and cold water heater blender valve between the two MUST be shut off after you unwinterize or you will cool your hot water unwanted and have no hot water to use! Happy Camping folks!
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May 14, 2012 - Uploaded by Lakeshore RV Center
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