Quote:
Originally Posted by jalad12
2019 Cougar 27Res. On my maiden voyage! Hooked up to a 50 amp circuit at a campground. Wired for 50 but have only one A/C unit. Things seemed ok for the first two days. Running A/C during day, fridge on electric, water heater on electric/gas, and toaster oven for toast at breakfast. This morning, the third day, voltage was 11.5 and steady. We left for several hours and returned to find voltage at 8.4. I checked the converter and The 35 amp fuse was blown. The 40 amp fuse was intact. I only had a 30 amp fuse to replace with and when I put the new fuse in the fan kicked on for about 5 seconds then shut off. I removed the fuse and checked it. It was still good. I put it back in and the fan again ran for 5 seconds before stopping. This cycle happened two more times before the fan didn’t come on at all. Do I need to charge the batteries before the converter will stay on ? Do I need a new converter? In the meantime, my slide outs won’t retract and I’m not sure if the auto leveling device will work. I’m supposed to be out of the campground in 12 hours!
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My bet is the converter is ok. The batteries are, or at least one is bad. Each 12v battery is made up of 6 cells each storing 2.2vdc at full charge. If one cell is shorted the reading would be around 11vdc. The 35a fuse is probably the charging line back to the batteries. It likely blew due to the shorted/bad battery.
If you disconnect the batteries you can check the converter output by connecting to shore power as described earlier. If the lights in the trailer work and you're getting 13+ vdc at the main battery connection in the converter then the converter is OK.
With the batteries disconnected check the battery voltage of each, separately.
If one is in the 12v range hook it up. connect the tow vehicle cable to the trailer with the engine running and try your slides.
If neither battery is reading 12v. get/borrow another battery to operate your slides temporary until you get home and can have the batteries tested.
The slides are wired ahead of the converter so if the converter is bad it won't keep the slides from operating, but you must have a battery connected.