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Old 07-21-2015, 10:17 AM   #1
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1988 Granville MH no DC power

I have been beating myself up over this.. We took our motor home camping last month and it rained heavy for the whole day. Shortly into our stay I noticed all my accessories as far as the AC, water pump, range hood, and other hood controls had no power to them. Although my interior lights and recepticals did. We were hooked to a separate generator and not using the one onboard. All my fuses and circuit breakers were fine and not tripped. I took the mh home and realized that the 30a shore plug was filled with mud. I cleaned it very well and reconnected to power from my house. Still nothing. Now when I start up the motorhome there is power where I did not previously have it when just hooked to shore power... Is this a sign that my power converter is damaged or inoperable? Any information would be greatly appreciated. Thank you
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Old 07-22-2015, 10:53 AM   #2
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Welcome to iRV2.

Are your interior lights , 12v or 120v ?

If the lights are 12v; and the lights were working, and other 12v systems were not, you probably have a blown fuse for the non-operating systems.
If the lights are 120v, then a converter/charger problem is a possibility.
Do you have a multi-meter ?
When plugged into shore power , you should get 13.2v > 14.2v from the C/C to the coach battery, if you don't then you need to test the C/C for power supply 120v, and any fuses or breakers on the C/C, its self.
If the C/C has power and no blown fuses , and no output there is a very good chance it's gone bad.
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Old 07-28-2015, 11:48 AM   #3
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Welcome to iRV2.

Are your interior lights , 12v or 120v ?

If the lights are 12v; and the lights were working, and other 12v systems were not, you probably have a blown fuse for the non-operating systems.
If the lights are 120v, then a converter/charger problem is a possibility.
Do you have a multi-meter ?
When plugged into shore power , you should get 13.2v > 14.2v from the C/C to the coach battery, if you don't then you need to test the C/C for power supply 120v, and any fuses or breakers on the C/C, its self.
If the C/C has power and no blown fuses , and no output there is a very good chance it's gone bad.
At shore power I'm getting like 11.3 all fuses and breakers are fine. Like I said all the DC power works when the rv engine is running and I'm sure the lights are 12v
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Old 07-29-2015, 10:30 AM   #4
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At shore power I'm getting like 11.3 all fuses and breakers are fine. Like I said all the DC power works when the rv engine is running and I'm sure the lights are 12v
At 11.3 volts , you have a Converter/Charger problem , there may be fuses or circuit breakers , on the C/C that need to be replaced or re-set.
Or there may be a master fuse or circuit breaker between the C/C and the battery that's stopping the charge from getting through.
You need to check for power out-put at the C/C.
If you put an aux battery charger on the coach battery to bring the volts up to 12.4+ will your systems work properly , as they do from the engine alternator?
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Old 07-29-2015, 11:03 AM   #5
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What chassis??
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Old 07-30-2015, 04:32 AM   #6
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What chassis??
E350 debonair
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Old 07-30-2015, 07:13 AM   #7
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At 11.3 volts , you have a Converter/Charger problem , there may be fuses or circuit breakers , on the C/C that need to be replaced or re-set.
Or there may be a master fuse or circuit breaker between the C/C and the battery that's stopping the charge from getting through.
You need to check for power out-put at the C/C.
If you put an aux battery charger on the coach battery to bring the volts up to 12.4+ will your systems work properly , as they do from the engine alternator?
So as a temporary fix I can hook up a battery charger to my house battery and still run my DC accessories? Am I to the point where I should just replace the c/c?
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Old 07-31-2015, 09:43 AM   #8
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So as a temporary fix I can hook up a battery charger to my house battery and still run my DC accessories? Am I to the point where I should just replace the c/c?
I had to use a battery charger for 3 days while waiting for my new C/C to be delivered. Voltage at the fuses should be the same as that at the batteries; if not you have a connection or wiring problem, between the battery and fuses.
If your C/C has 120v, power to it , and there are no fuses or circuit breakers on the unit that need to be replaced or reset , then there's a really good chance that it's dead and needs to be replaced.
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