Forum Discussion

simionsen's avatar
simionsen
Explorer
Feb 19, 2016

electrical

I have a 2007 Itasca sunova 35J

house batteries charge when on shore power as well as when the generator runs, but not when driving. I've looked through the web and found that it's possibly the solenoid? There is a click when I push the auxiliary battery button....thoughts. Thanks!

19 Replies

  • I looked for a fuse, but think I may not have a battery control center
  • Did you locate the battery control center?
    Did you check for blown control fuse?
  • Scott, Your description is great and it seems to be my setup. The battery boost switch seems to do nothing when I push it. I don't hear a click or anything. The house battery shutoff does click when I use it and it does shut off the power in the house. It's looking more and more like it may have something to do with the battery boost switch. I'm not sure where that solenoid is actually located though.
  • simionsen wrote:
    I have a 2007 Itasca sunova 35J

    house batteries charge when on shore power as well as when the generator runs, but not when driving. I've looked through the web and found that it's possibly the solenoid? There is a click when I push the auxiliary battery button....thoughts. Thanks!


    simionsen,
    Not knowing your SPECIFIC electrical layout pertaining to charging I will tell you how our ITASCA is laid out and works. They may, or may not be the same. Ours is an Itasca Horizon, 36GD with the C-7 330HP CAT. There is no battery control center or anything like it. What there is, is two large solenoids, in electrical/shore power compartment (again, may or may not be anything like what you have or where).

    One of the solenoids is the House battery shut off. That one terminates all 12V power to the house appliances, lights etc. The other solenoid is a dual duty solenoid. It's first duty is to provide a connection between the chassis batteries and the house batteries, in the event that the chassis batteries are two weak to turn that big CAT over. You control this by pushing on the "Battery Boost" switch, on the dash.

    When you push that switch, you send a signal to that large solenoid and, it "clicks" (internally connects) and, that links both battery banks together.

    Now, it's second duty is, to link the engine alternator to the house batteries, for charging. That operation is done automatically after the engine is started. A signal, much like the one you send it when pushing the battery boost switch, is sent to that same solenoid and, it's SUPPOSED TO CLOSE, automatically. And, when that happens, your alternator is now charging both the chassis and house batteries.

    But, if your system is even close to the same as ours, the "click" you're hearing, may be that same type of heavy duty solenoid but, just like it's happened on many, many other Winnes and Itascas, especially of that era, that solenoids internal contacts, can become corrodes and or, pitted with a form of carbon. When that happens, the solenoid is working but, the contacts are not permitting 12V charging power to travel across them.

    Some of us, not many, have taken that solenoid completely apart and, cleaned the corroded terminals/contacts and, reassembled it. There is absolutely nothing wrong with doing this. I did ours over a year ago, and, have put a few thousand miles and hours on it and, it's working flawlessly.

    Most will simply replace the solenoid with something equal or, the same one.

    Now, again, all that I've said above may, or may not apply to your system. You'll have to determine if your system is the same or not. There are electrical wiring diagrams for Winnes and Itascas in IRV2s forum. You may be able to simply go online to obtain the same ones to see just how your system is laid out. Good luck and please post what you find as a remedy.
    Scott
  • You may have 2 solenoids.

    One solenoid connects the 2 battery systems together for starting assist as long as you hold the auxiliary switch.

    Another solenoid is for connecting the 2 systems together when driving for charging.

    The solenoids are not interchangeable and have different part numbers.
  • When my C did that, it was a bad battery relay (solenoid). From reports here, I think that's fairly common around the 8 year mark.
  • There is one relay that connects the two systems together in the battery control center. They are controlled by fuses in the battery control center. The charge circuit could have a blown fuse.
    Look for battery control center make and model. Post and someone could help.
    RV custom products fuse #17 or fuse #20 or fuse #22 for rev C
  • With the engine running and shorepower/generator off, meter the house battery voltage. Then press the auxiliary start button and see if the voltage goes up. If it does, then the solenoid is ok, but the connection that engages it when the engine is running may be disconnected, broken, or corroded. It may be easier to just run a new wire if the existing wire is hard to trace.