lights dimming

Converter. Possibly bad batteries.

Is your FW hooked up to shore power or a generator when this happens? If so, I'd suspect the converter. If not, I'd start my trouble-shooting with the batteries.

Thanks yall, We are always hook up to power were full timers , this started about a week ago . is the converter something that's easy to replace

It's not too hard to do, but if you aren't familiar with the electrical system in an RV, it might be better left to the pros.

There are troubleshooting techniques you can use to isolate the converter, and safety practices you must follow when replacing. The most important safety instruction is to disconnect from shore power and disconnect the battery before you start to remove it.

If you have some basic mechanical and electrical skills, it's fairly straight forward. Disconnect from the 120VAC and 12VDC sources. Remove the screws holding the converter in the housing. Pull the converter out, and disconnect the 120V and 12V wires. Take a picture of the wiring before you disconnect it so you'll know how it goes back together. Install the new converter and reconnect everything.

FWIW - The last time my converter went out, the primary symptom was the lights getting dimmer and brighter which are the exact same symptoms you are describing.

Shorted bttery could be sucking all the juice the converter can make qnd then some start with the basics. Battery, then wiring then converter

A shorted CELL in a battery will cause this. I would most definitely check the batteries fluid levels and see if the battery case is getting hot to touch when this start happening.

Roy Ken

Well since were hooked up to shore power he turned the charger part off yesterday afternoon and the light have not dimmed at all so maybe it is the battery and not the converter
Thanks y'all for the help

Before ripping everything to pieces & buying parts that may not be needed, start with the basics right at the battery. Are the terminals clean? Are the connections tight. So often the simplest things cause problems.

Mine did the exact same thing just before the converter quit working.

Just be aware that with the converter turned off your battery is not being charged and will probably drop below 12.0VDC pretty soon. Continuing operating the battery below 12.0VDC (approximately 50% charge state) usually does harm to the battery requiring it to be replaced as well...

You can hook-up a portable battery charger to your battery setup if you have one.

You need to make DC VOLTAGE measurements to determine what is going bad...

You should read 12.6VDC across the battery terminal when not on shore power and the battery is fully charged.

Turning on shore power which in turn turns on the on-board converter/charger should read 13.6VDC on the battery terminals. (Your ceiling lights should get brighter when you do this). If you have a smart mode converter/charger installed on your trailer then the DC VOLTS OUTPUT will normally be at 13.6VDC or sometimes 13.2VDC. It will produce 14.4VDC when in boost charge mode for around three hours but for the most part will read 13.6VDC when it is turned ON. Some model converters/chargers will go to above 15.0VDC for about '15 minutes' every 20 hours doing battery maintenance. Mine does the 14.4VDC when doing this maintenance mode. A smart mode charging system should not boil out battery fluids but you should always get in the habit of checking battery fluids. I check mine every two weeks or so.

Roy Ken