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Author Topic: Dimming Lights  (Read 322 times)


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Dimming Lights
« on: May 01, 2018, 02:50:24 PM »
I noticed on our last trip that the lights in my trailer would dim slightly for a few minutes, then brighten up for a few minutes.  Maybe it's just me but I've never noticed this before. I'm now plugged in at the house and it's still doing it.

Is it normal or a sign of something failing?
2007 KZ Sportsman 36SE3 Toy Hauler
2016 Ram 3500, CTD, Aisin, Dually
Monument, CO


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Re: Dimming Lights
« Reply #1 on: May 01, 2018, 03:08:57 PM »
I had a similar problem and it was the converter overheating. I wound up replacing the converter.  Most, if not all, converters have a built in cooling fan that kicks on to remove heat from the converter as it operates. Depending on the load on the converter, the fan will kick on and off.  In mine, when the converter was supplying power to the battery and other DC components (lights, etc) the voltage output would be about 13 to 14 volts. When the converter shut off due to overtemp, the lights reverted to strictly battery voltage, about 12.6 V. This converter shutdown caused a noticeable decrease in lamp intensity.
In my bad converter, the cooling fan operated but the converter module was obviously shutting down even with the fan blowing.  The shutdown would last about 5 minutes, then come back on, lights would get brighter and process would repeat in a few minutes.
Replacement converter fixed the problem.
« Last Edit: May 01, 2018, 08:18:30 PM by regval »
2005 Forest River TT 27BHSS and 2009 Heartland Sundance 2998RB 5vr
2007 Chev Silverado 2500HD WT crew cab, LB, 6.6L, Allison 6sp, B&W Companion Hitch
Retired Biomedical Engineer

"Some come to the fountain of knowledge to drink, others just gargle."


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Re: Dimming Lights
« Reply #2 on: May 01, 2018, 07:29:05 PM »
Thanks for that info regval. Sounds like a problem that my friend is experiencing. Now I
have a place for him to start looking.
Butch & Joanna
Ram 2015 Reg Cab 1500
2015 Keystone Passport 2890RL