12v lamps go dim, then bright repeatedly
Our interior 12v lamps have begun to dim (maybe 30%) for about a minute then return to full brightness for a while, then dim again. This goes on indefinitely. We are traveling and I have checked the...
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I would measure some DC battery voltages. A fully charged battery setup should read around 12.6-7VDC without the shore power connected.
The on-board converter/charger when connected to shore power should be putting out a steady 13.6VDC unless it is doing its smart mode events. My DC output from my on-board converter/charger unit can read 13.2VDC, 13.6VDC, and 14.4VDC depending what mode it is in at the time. Other brand converters/chargers may put out 15VDC for about 15 minutes every 21 hours doing what they call a desulf mode.
Sometimes a shorted cell in your battery setup will really work on your converter/charger unit trying to overcome the shorted cell status. This usually ends up getting your batteries very hot and they may boil out battery fluids.
This is not normal for your 12VDC system to be doing this... Batteries and the on-board converter/charger will be suspect items.
Roy Ken
The on-board converter/charger when connected to shore power should be putting out a steady 13.6VDC unless it is doing its smart mode events. My DC output from my on-board converter/charger unit can read 13.2VDC, 13.6VDC, and 14.4VDC depending what mode it is in at the time. Other brand converters/chargers may put out 15VDC for about 15 minutes every 21 hours doing what they call a desulf mode.
Sometimes a shorted cell in your battery setup will really work on your converter/charger unit trying to overcome the shorted cell status. This usually ends up getting your batteries very hot and they may boil out battery fluids.
This is not normal for your 12VDC system to be doing this... Batteries and the on-board converter/charger will be suspect items.
Roy Ken
