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mikathi's avatar
mikathi
Explorer
Nov 11, 2017

House batteries not charging 2005 Sunvoyager Part 2

[img][/img][img][/img][img][/img]continued from my last entry. Converter output is 13.6 but new batteries won't charge . Likewise running the generator doesn't charge the house batteries either. I can run the engine for 15 minutes and the batteries charge up enough to get us through one day. breakers test okay. stub mount breaker also fine. I went to an auto electric shop to see if they'd look at it. I had a discussion with the tech. He mentioned an ISOLATOR RELAY? As I understand it, this isolator relay connects with the available power supply. which ever I;m running be it the engine, the generator or plugged into the land line. The problem is, I can't locate an isolator but i do have something called "Lyght Power System, Automatic transfer switch". I'm guessing this is an isolator relay??. This also a black box with stubs and relays. The marks are M1, B-, B+ and M2.
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  • mikathi,

    Transfer switches are for 120 volt alternating current.

    Isolation relays are for 12 volt direct current.

    Usually the relay is intended to prevent the starter battery from being drained. Since that is not happening to you, and you are getting charging from the alternator when you run the engine, this is NOT the problem.

    The problem appears to be in the circuit from the converter (13.6 volts) and the house battery bank.
  • Converter doing 13.6v
    And no charge to batteries
    Broken wire,? In circuit between converter and batteries
    Do you have the B.I.R.D. ? Bidirectional charge control relay, battery control center
    UNIT IS BAD, allowing only a one way charge

    There birds job is to charge both house and engine batteries from either alternator or converter and to keep them isolated

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