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AJarand's avatar
AJarand
Explorer
May 27, 2020

Coach battery not charging

I have a 2005 Phoenix Cruiser on a Ford E350. Generator is Onan 4000.
Generator runs fine, but does not charge the coach battery, the engine does not charge the coach battery, and plugging the RV in does not charge the coach battery. Only way to charge it is to put a charger on it. (Battery is good, fairly new and once charged holds the charge fine)
Whats the common denominator keeping the coach battery from charging?
My electrical knowledge on these things is a bit limited.
  • AJarand's avatar
    AJarand
    Explorer
    May 27, 2020
    Battery powers the coach fine. Genset puts out power.... Just cant get power to the coach battery for recharging. THanks for the reply BTW
  • DrewE's avatar
    DrewE
    Explorer II
    May 27, 2020
    Does the coach battery supply power to the coach once it's charged? It sure sounds like it simply isn't connected for some reason--a loose or damaged cable, a bad ground connection, the battery disconnect switch set to disconnect (storage) rather than connect (use), a blown main fuse or tripped main breaker, etc.

    If you're getting power from the battery, but it's not charging from any of those sources, that's rather more mysterious. As best as I can tell, you have a combination of two faults: a bad or mistakenly disconnected converter and something wrong with the battery isolator circuit (such as a bad solenoid). Both the generator and shore power use the converter to charge the battery.

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