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Old 08-23-2020, 08:16 AM   #1
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Coach Batteries & Norcold Fridge Questions

How do you know if your coach deep cycle batteries are bad?
I'm plugged into 30-amp service reading 115 volts and my inside coach lights are dim and the refrigerator is reading a C?
After running the engine a bit everything seems to be fine until I shut it down, then things start to act up again, could this be the two coach batteries?
Any help would be highly appreciated.
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Old 08-23-2020, 08:42 AM   #2
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Ultimately, you should have the batteries tested.

Alternatively, check the charging voltage while plugged in. It should be ~13.5-14.2. Resting voltage should be ~12.7.

Is your charger/inverter charging? From your description it sounds like the alternator is charging but the charger may not be charging. It is also possible that the batteries are no longer able to hold a charge.
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Old 08-23-2020, 08:54 AM   #3
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You have a converter/charger problem.

When you start the engine, the chassis charging system also charges the house batteries, give you what your experiencing.

Look for a circuit breaker marked CON that may be tripped or if you accedently crossed the battery cables, two tripped fused on the converter or fuse panel.

Some converter/chargers are plugged in to GFCI outlets, check for the plug out or a tripped GFCI outlet.
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Old 08-23-2020, 10:13 AM   #4
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Where would the converter/ charger be?
Fuses / Circuits and GFCI outlets seem to be fine.
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Old 08-23-2020, 10:16 AM   #5
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Where would the converter/ charger be?
Fuses / Circuits and GFCI outlets seem to be fine.
Hard to say. What is the make, model and year of your coach?
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Old 08-23-2020, 10:22 AM   #6
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Would the lights dim when plugged in to shore power or do they still draw on the house batteries?
Pretty sure the house batteries are OK but they are like 7-8 years old and they have juice for the auxiliary boost for engine / start battery. Replaced engine battery yesterday.
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Old 08-23-2020, 10:25 AM   #7
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Old 08-23-2020, 10:27 AM   #8
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How clean are the batteries?
How old are the house batteries?
Do you see any corrosion on the battery post?
Have you ever removed and cleaned the battery connections?
Do you have, and have you ever used a battery hydrometer? It can tell you the condition of any wet cell battery.
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Old 08-23-2020, 10:28 AM   #9
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Would the lights dim when plugged in to shore power or do they still draw on the house batteries?
Pretty sure the house batteries are OK but they are like 7-8 years old and they have juice for the auxiliary boost for engine / start battery. Replaced engine battery yesterday.
Most likely you have both 12V and 120V lights in your coach. Can you confirm that it is only the 12V lights that are dim? Do your 12V ceiling fans seem to operate properly? Have you measured the DC voltage?

7-8 years is a long life for deep cycle batteries in an RV, even if they have been properly maintained. How can you be sure the house batteries are ok if you haven’t tested them and are experiencing 12V problems?
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Old 08-23-2020, 01:38 PM   #10
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All inside coach lights are 12V, no ceiling fans.
All battery post are cleaned up and looking good, never used a battery hydrometer but going to check it out, coach battery level meter reads batteries fully charged.
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Old 08-23-2020, 01:46 PM   #11
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They should go bright when plugged in. That's what the converter/charger does.It takes 120 volts and converts it to 12 volts.

Powers the 12 volt stuff and charge the batteries. Its not working.

It may be under the fuses and circuit breakers. All power off, remove a few screws and pull off the steel panel with the circuit breaker labels on it.
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Old 08-23-2020, 01:48 PM   #12
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All inside coach lights are 12V, no ceiling fans.
All battery post are cleaned up and looking good, never used a battery hydrometer but going to check it out, coach battery level meter reads batteries fully charged.
Unplug, and read that battery meter.
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Old 08-23-2020, 05:32 PM   #13
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New twist to my question folks on this wonderful evening.
I shut down the refrigerator, started the coach and ran it for 15 minutes, in the meantime I switched the refrigerator from AC to LP while plugged in and everything is working fine.
Now whats the problem with the refrigerator not working on AC but perfect on LP?
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Old 08-25-2020, 12:01 PM   #14
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I think the difference was starting the engine, not the LP gas mode. That lets the engine alternator provide 12v to the house and charge the batteries too. The fridge requires 12v for its control circuit board, regardless of mode.


Your batteries should not be the power source when plugged to shore power. You need to be looking at why your converter/charger (power center) is not producing 12v power. If it was, the batteries would not be involved.
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