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Old 08-29-2016, 08:18 AM   #1
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Dimming 12v lights

My 12 v lights when plugged into shore power are bright and then will dim for sort period of time then go bright again. Any suggestions.
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Old 08-29-2016, 09:11 AM   #2
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Welcome to iRV2.

Check the RV battery (ies) , connections , electrolite level , and even take it out for a load test. If the batteries and connections check out , then try to get a voltage read out, at the batteries during the dim period , you could be looking at the earliest signs of a converter/charger failure.
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Old 08-29-2016, 09:15 AM   #3
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If they are dimming periodically while plugged in I might consider temporarily disconnecting my batteries and seeing if the converter is ok.
At the very least get a multi meter and see if your batteries are being charged correctly
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Old 08-30-2016, 07:55 AM   #4
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diming lights

don't know what type coach you have but just had same problem. Look at my post on diming lights. Easy fix
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Old 08-30-2016, 08:11 AM   #5
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I was having the same problem and it turned out to be a bad dimmer. In fact it had started to melt and was a fire hazard. I replaced the bulbs with LED bulbs and a LED dimmer and it's been fine ever since. I also corrected the polarity of the wiring which had been reversed.
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Old 08-30-2016, 09:07 AM   #6
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The converter/charger is cycling, causing the voltage to rise/lower. That is usually a sign of bad battery(s). When the battery is bad, e.g. shorted internally, the attempt to charge it takes most all the converter/charger power output and the voltage falls. Then the charger quits charging to avoid overload and the voltage rises again. The after a brief time, the charger makes another attempt top bring the battery up and the process repeats.
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