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Old 09-27-2015, 01:57 PM   #1
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Circuit Panel/Converter Heads Up

Camping last week, on last evening, with 30amp electric plugged in routed through protector that does it all, surge, hi/low voltage, neutral ground sensing etc. Had DC lights flickering & radio (on DC circuit) cutting in/out. Looked at circuit panel but nothing obvious so pushed dc fuses, water pump fuse a little out of place so removed looked at it and put it back in.

Checked pump but it did not work. Also found that other items had ceased working on the convenience panel. Went back to DC side of circuit panel pulled/put back in fuses. Things worked again. So left everything alone knowing more had to be done at home. This was the last night returned home next day.

At home removed external AC electric. Turned battery isolation switch to off. Ensured no power to AC or DC circuits. Removed cover from the circuit panel and started checking the wiring. All grounds and wiring from converter and battery were good.

What I found was the water pump power wire at the terminal, by the fuse, was almost completely burned through, hanging by a couple of strands. Removed the wire, trimmed the burned end, cleaned the terminal, pulled the fuse and replaced it with a new one and reattached the wire, checked all other terminal connections which were solid.

Put everything back together, applied all power and tested the systems. All now appears to be OK.

Just a heads up that if you are having power problems you might want to check the wiring on the fuse/circuit breaker terminals.
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Old 09-27-2015, 02:05 PM   #2
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I found several of the 12V connections in our TT (especially the wire nut connections) were incorrectly done. When the wire was stripped to make the connection, it was incorrectly done resulting in some of the wire strands being cut. This results in an increase in resistance and a potential hot spot under load. I have since redone the majority of the wire nut connections in the TT.
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Old 09-27-2015, 02:29 PM   #3
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Just like your home, loose connections are a fire waiting to happen.
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Old 09-27-2015, 03:29 PM   #4
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Oops, seems I spoke too soon about everything OK. DW was out in the motorhome doing some cleanup getting ready for winter storage. She comes back in and says the lights are flickering. I went out and started checking again. It seems that the battery was down a little bit and the converter charger was cycling on/off the lights dimmed on/off with the charger. The charger did not charge the battery. I turned everything off then on and the converter seemed to work properly after that. My guess is the old converter, a WF-9855 WFCO 55amp power converter, is starting to fail.

Since we are preparing for winter storage anyway I have removed the AC and turned the Battery Disconnect (proper terminology) to off. I'll remove the batteries tomorrow.

I'll do research to find a new converter during the winter and install in the spring.
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Old 09-28-2015, 01:17 PM   #5
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Get a good 3 stage converter. Make sure the maintain voltage is not more than 13 volts. This will help battery life.
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Old 09-28-2015, 01:29 PM   #6
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Time for a progressive dynamics converter with charge pendant.

The converter is cycling due to overheating.
On lights bright
Off lights dim.


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Old 09-28-2015, 02:07 PM   #7
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TURBS

The cycling is as you describe. Just removed the batteries from the MH as the MH is going to winter storage. I will check the batteries see if there is an issue there as well.

Checked the price, in Canada, of the PD 9260 -- $429 CAD!!!!!!

Was looking at replacing passenger seat, not now, converter first!
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Old 09-28-2015, 02:08 PM   #8
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Could not hurt.

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Old 09-28-2015, 02:46 PM   #9
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I would ensure that it isn't the batteries that are causing the converter to shut down. Check them with a volt meter or at least see if they are low on water when no AC power is supplied to your rig.
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Old 09-28-2015, 03:00 PM   #10
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Extremely low battery voltage is not the only failure mode that will prevent your converter from starting. A shorted cell will also prevent the converter from turning on.

If the other cells are OK, the voltage will appear low but chargeable, yet the battery will fail a load test. The converter will "see" the shorted cell and not turn on to save itself from the inevitable overload.
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