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    I'm a mech engineer and new to RV's. Other interests are remodeling my house, renewable energy, and air guns.
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  1. I think I solved the problem of the coach batteries not charging when on shore AC: The coach battery disconnect relay feeds into a ShortStop 40A circuit breaker. I just realized that there's a little black button that resets the Shortstop breaker. I pushed the reset and it started charging the coach batteries. I feel kinda dense for not noticing the Shortstop reset, but it is not marked and there are no directions. I'm an engineer but I have no experience with RV electrical systems. I basically had to figure out the entire battery disconnect and charging system. I have spent at least 50 hours on this problem. I took the RV to two RV repair shops around Pittsburgh and neither one of them would even try to diagnose the problem. They said they repair RV's but electrical systems are too complicated for them. I must agree. I tried to attach a photo of the Shortstop breaker for others, but it won't let me. A window pops up and asks for URL to the image. How do I attach a photo to my post? To see if the problem of parasitic drain had been solved, I disconnected shore AC and measured 12.58 V on the coach batteries. 18 hours later the coach batteries were at 12.49 V. Now that the batteries are being charged by shore AC, the 40A AC-DC converter should easily cover the parasitic load when on shore AC. We're going to sell this RV and buy a newer, smaller one -- and I'll be sure to buy a shop manual with it!!! Thanks everyone! Frank
  2. Each rocker switch is supposed to receive 12V. Then the switch sends + or - 12V to the disconnect relays to open/close the relay. The chassis rocker switch is receiving 12V. The coach rocker switch is receiving only 2.5V. I just connected the 12V supply from the chassis switch to the coach switch, and the coach switch now works. But I think you're right, I could have a short somewhere in the wiring to the coach rocker switch.
  3. Thanks to your expert advice, I have the battery disconnect relays working now. But power from the coach batteries is not being delivered to inside the RV. The chassis power works fine and the engine starts. The power from the coach disconnect relay goes through a "short stop" breaker that is labeled "Short Stop 24V D33 4OA." (I tried to attach a photo, but it asks for a URL. When I tried a URL is gave an error?) I jumped it with my multimeter and 1.5 A is flowing through it. That's only 18W at 12V. Is that too much for a normal drain from the coach with everything off? In any case, I'm going to replace it and see what happens. Thanks, Frank
  4. Update: I took apart the Power Distribution Panel and verified that the Intellitec Battery Disconnect Relays are working. Inside the door of the RV are two rocker switches that open/close the Battery Disconnect Relays. The switch for the coach batteries was only receiving about 2 V. It needs 12V to open/close the disconnect relays. So I jumped the 12V feed from the chassis switch into the coach switch, and it now the coach disconnect relay works. Also, the coach batteries are no longer being drained by a parasitic load. Some progress, slowly. Thanks, Frank
  5. Thanks so much for the service manual Rich! I had been trying to find it for a long time. I started it again and let it run for awhile and the engine speed gradually slowed down to normal. It ran for about 20 minutes then shut down. I'm hoping I've brought it back to life, with good advice from this forum. Thanks, Frank
  6. OK, I got the generator to start! But it sounds like it's running at full speed so I shut it down after a few seconds. I'm thinking the linkage that controls the carb is stuck? Any other thoughts? I agree completely with Kay: I need to run the generator on a regular basis to keep the brushes and carb clean. Thanks everyone! Frank
  7. I flushed the carb with concentrated fuel injector cleaner and let it sit for 24 hours. I've verified that it's getting gas and the fuel pump works, it's getting spark, it's getting 12.7 V from the batteries. I tried several times a day for several days to get it to start. So I've given up and scheduled an appt with Cummins Onan near Pittsburgh. It's a one hour drive each way. Last year it cost me $150 to fix this problem. I will post what the Cummins Onan tech's say was the problem. Thanks for trying to help! Frank
  8. Thanks Rich, I just made a mixture of 8 oz of fuel injector cleaner (enough for 20 gallons of gas) and 8 oz of gas. I fed it through the fuel intake line. So the carb bowl is full of concentrated fuel injector cleaner and hopefully it will dissolve the gum. I will let it sit for a few hours and try it again. Thought I would try that before taking the carb off. That also verified that the fuel pump is working. Will let you know the results. Frank
  9. I added carb cleaner to the gas and sprayed carb cleaner into the carb, then let it sit for a few hours. I removed the air filter and sprayed starter fluid into the air intake. It sounds like it's firing when I hold the start button down, but as soon as I release the start button, it shuts down. I've tried to start it at least ten times, hoping the clog in the carb would clear out, but it hasn't (if it's a clogged carb). What next? Do I need to pull off the carb and soak it? I'll verify I'm getting gas and spark first. Thanks, Frank
  10. Rich, Good call. You are right, even though the fuse is in the chassis fuse box, it is causing a 1.5A drain on the coach batteries. The Intellitec disconnect relay for the coach batteries is not working. I have ordered a new relay and new switch panel. Helps to have a second set of eyes! Thanks, Frank
  11. Potable water tank. The fill port is at the rear corner of the RV, driver's side. Thanks, Frank
  12. I have a 1998 Thor Four Winds Windsport RV. It has a water holding tank near the rear of the RV. I can't find the valve to drain the holding tank. Anyone know where I might find the drain valve? Thanks! Frank
  13. I have an Onan 4.8kw gasoline generator in my RV, Model 5BGEFA26100N, SN H973723191. It cranks and sounds like it's firing when I hold the crank button down, but when I release the button, the generator shuts down. Last spring I took it to an Onan/Cummins shop and they got it working. They said "the brushes needed cleaning" or something like that. We didn't use the RV last year, so the generator sat without being used for a year. Now it's doing the same thing, cranks and sounds like it firing when the start button is held down, but stops as soon as I release the start button. Thanks for any suggestions! Frank
  14. The fuse labeled "Body Builder Accessory Feed (Run Only)" is in the chassis fuse box under the dash. So the fuse is for a chassis accessory. I think Ford called it's electrical chassis system "Body Builder" for RV's. I cannot find anything that stops working when I start the RV and pull out the Body Builder Access fuse. The engine runs. The lights, AC, windshield wipers all work. What other chassis accessory could there be that is only turned on when the engine is running? Thanks, Frank
  15. There is an Intellic relay based battery disconnect system. Just inside the door are two rocker switches that activate battery disconnect relays. Is that what you're referring to?
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