Quote:
Originally Posted by CoachKD
Good Morning,
I have a 2017 Thor Motorcoach Challenger 37YT and I am having low voltage issues. I just replaced both of batteries for the 12 volt system and tested the coach battery. I am hooked to a 50 Amp 220 volt shore power, but have no low voltage unless I run the engine. I have 220 and 120 voltage at the main breaker and all other breakers. I have pulled and tested all 12 volt fuses, tested voltage at the convertor and I have 120 volts coming and 12 volts out. The fuse at the battery is good and not tripped, but still no low voltage. Any ideas where else to check?
Thanks in advance for any assistance.
Kevin
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Quote:
Originally Posted by CoachKD
the lights and the AC started working after I changed the batteries, but still not low voltage at the controller for the jacks or the slides.
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You say you have a low voltage problem but then continuously contradict that with "no low voltage". It's quite confusing.
Please define your problem. There are multiple voltage systems in a motorhome:
A 50 amp motorhome has 240 VAC from SP which is usually split into two 120 VAC legs for outlets, Air Conditioners, Microwave, maybe the fridge, an electric water heater element and the Converter/Charger.
You have the Chassis 12 VDC system for running the engine and its associated loads and sometimes the steps.
Then you have the 12 VDC HOUSE system which powers the interior lights, furnace, control power for the thermostat, absorption fridge and water heater; leveling jacks, slides, and some dedicated USB charging ports.
I believe you have concerns with the house system?
The converter/charger (if powered) will supply AT LEAST 13.1 VDC to the house DC buss (not 12.6 VDC as previously mentioned) if it is working correctly. It may provide up to 14.5 VDC if bulk charging the house batteries.
If not connected to SP for an hour or so and with no DC loads running the house batteries should be at about 12.6 VDC
The house batteries will also be charged by your engines' alternator when the engine is running (and the chassis battery by the converter/charger when plugged into SP).
The house batteries are disconnected from the DC buss (and the Converter/Charger) by your USE/STORE switch (in STORE). There is also a 50 amp DC breaker near the house batteries that when tripped (flag out) will also disconnect the house batteries from the DC buss.
You can trip the breaker by pushing the button and reset the breaker by pushing the flag back in. The button and flag can be any color.