Forum Discussion

Magman57's avatar
Magman57
Explorer
Nov 17, 2018

Interior lighting dimming intermittently

I noticed my interior lights would dim and after a whole they would brighten antd the fan in the power supply box would come on. Something is not right. Ideas?


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  • drsteve's avatar
    drsteve
    Explorer
    Nov 17, 2018
    Old-Biscuit wrote:
    When on shore power converter supplies DC System and maintains battery voltage which should have much draw due to converter supplying DC System

    Disconnect POS Cable on battery (Or on DC Dist Panel)
    Measure Converter DC output...should be 13.2V DC Minimum.
    Any lower converter failing
    DC Output fluctuating/not steady....converter failing

    IF converter checks out...measure battery cells using hydrometer OR take battery ato any auto parts place and have it load tested


    Yup.
  • garyemunson's avatar
    garyemunson
    Explorer II
    Nov 17, 2018
    A good converter never 'turns off', just slows down the charge rate. Voltage should stay up even if the battery is getting old. His converter is bad. Battery is probably maimed also from being poorly charged by the dying converter. New converter first. That should fix the dimming, then new battery/s if it goes dead too quickly when unplugged.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Nov 17, 2018
    When on shore power converter supplies DC System and maintains battery voltage which should have much draw due to converter supplying DC System

    Disconnect POS Cable on battery (Or on DC Dist Panel)
    Measure Converter DC output...should be 13.2V DC Minimum.
    Any lower converter failing
    DC Output fluctuating/not steady....converter failing

    IF converter checks out...measure battery cells using hydrometer OR take battery ato any auto parts place and have it load tested
  • Dick_B's avatar
    Dick_B
    Explorer
    Nov 17, 2018
    Funny thing; I thought it was classic signs of a bad battery. The converter would charge it up and the lights would come on bright. Then the converter would stop charging because the battery was fully charged but the battery could not HOLD the charge and the lights would dim. But what do I know?
  • ScottG's avatar
    ScottG
    Nomad
    Nov 17, 2018
    Absolute classic sign of a dying converter - but get your battery checked first.

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