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When I plug in the trailer's 30 amp cord into shore power, and energize the converter's circuit breaker, I read 18.4 VDC at my interior fixtures. The lighting gets noticeably brighter. Over a short period of time, I have burnt out several LEDs. This does not happen when I am boondocking on battery power. While the CCFL's don't seem to be affected, I have taken to swaping to incandescent bulbs while on shore power and only use LED "bulb replacements" when boondocking on battery power. I suspect that the converter has a failure in the output regulator circuit, but with a work-around, fixing it (without so much as a schematic) is low on my priority list.
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OK.
Modern converters have a method of disconnecting the battery when the battery voltage reaches a preset voltage to prevent overcharging (boiling out the water). I suspect you're right about the regulator being bad, which would could have the effect of disconnecting the battery. If it was me I'd check the voltage at the battery with converter is on. If you're getting more than around 14 volts disconnect the battery to keep from boiling it all away then check the voltage at the interior fixtures, it might go higher.
Another option would be to use a battery charger instead of the converter. Run off the battery all the time, when in camp where you have power connect a charger to battery to keep it charged. 10 Amp smart chargers are pretty cheap and will do the job.
As for the LEDs, I'm kind of surprised that they would "burn out" at that voltage. It possible that the design of your LED fixture or replacement bulbs is set to run near maximum current instead of nominal current. They would do that to get maximum
light output.
Anyway good luck with it all and happy camping.