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Old 05-26-2015, 08:00 AM   #1
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tucson , Arizona
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lights dim ,radio quits

We just got an 07 25fb and have an odd thing that happens when testing everything to go on our first trip. I had the radio on and turned on the overhead lights and the radio quits. As I turn on some other lights the overhead lights dim a little with each turn on. I've got it plugged into 110. Was told the batteries were new but I'm assuming that when plugged in the 12 volt stuff doesn't route through the batteries but is direct out of the converter. Is this how it works in this mode? I'm not the greatest with electrical as I'm a cabinet maker but for 90 bucks an hour @ the rv place I'm willing to try to do what I can. Any thoughts would be appreciated . Thanks

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Old 05-26-2015, 08:13 AM   #2
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The convertor is a battery charger and is wired in parallel with the batteries. While plugged into shore power the convertor keeps the batteries topped off and thus you should not see any deterioration in voltage while plugged in.

Remove the shore power.

I would put a voltmeter across the battery and while someone is watching it turn on and off lights one at a time to see if there is one light that effects the voltage. If that is the case there may be a short to ground in that fixture. Unlikely but a first test.

If that does not find it you have a problem that warrants more info before I can venture a guess.

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Old 05-26-2015, 08:18 AM   #3
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Fair Oaks , California
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The only things that should be running directly from the 110 power are your AC, fridge, power outlets, and your converter. Your converter takes the 110 power in and uses it to run its internal battery charger which keeps your 12v batteries charged. Everything else runs off of the 12v batteries. Your batteries could be new, but if they do not have a full (or nearly full) charge, and you turn on everything that runs off the 12v system to test it all at the same time, your batteries may not have sufficient charge to run it all. That could cause the lights to dim and/or the radio to quit. Check your systems monitor to see if it's registering low remaining power in your batteries. If so, you just need to charge your batteries fully and/or turn some stuff off. You can also test each of the lights one at a time.
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Old 05-26-2015, 08:25 AM   #4
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tucson , Arizona
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Thanks for the input as I'm kind of dense on this stuff! I'll do some more testing and see what happens.
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Old 05-26-2015, 09:10 AM   #5
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1993 21' Sovereign
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Check to make sure the breaker for the cconverter, as well as th two 12v fuses for the converter are all on and not blown.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
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Old 05-26-2015, 09:27 AM   #6
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1995 30' Excella
Bowie , Maryland
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Make sure that the converter is turned on - since the 90s or so, Airstream has been installing a switch so you can turn it off. Ours is behind the front curtain, curbside, but you have a completely different trailer so it may be in a different spot. It looks like a regular household light switch.

1995 Airstream Classic 30' Excella 1000
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