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Old 11-08-2005, 02:31 PM   #1
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When running 12v items in my trailer (when it's plugged into 30a service) the low 12v voltage warning starts beeping. I assumed that when I was plugged in the battery condition didn't matter. Is this true? (I know the batteries are shot). If it is true, shouldn't I be able to run 12v appliances without batteries even installed? Basically I'm trying to determine whether or not I have a dying converter or if good batteries are required for proper 12v operation even when the trailer is plugged in.

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Old 11-08-2005, 02:31 PM   #2
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When running 12v items in my trailer (when it's plugged into 30a service) the low 12v voltage warning starts beeping. I assumed that when I was plugged in the battery condition didn't matter. Is this true? (I know the batteries are shot). If it is true, shouldn't I be able to run 12v appliances without batteries even installed? Basically I'm trying to determine whether or not I have a dying converter or if good batteries are required for proper 12v operation even when the trailer is plugged in.

thanks
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Old 11-08-2005, 06:05 PM   #3
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Your conveter has diodes to rectify the AC into DC - some use a full bridge configuration while others use a simple two diode full wave rectifier. In either model if you lose a diode, you lose some of your voltage and current capability. The two diode verson will lose more than the bridge type. It is possible that your bad battery caused the diodes to work too hard and one of them could not keep up and it opened up.
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Old 11-08-2005, 07:33 PM   #4
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OK, i read through some other posts and decided to unplug the batteries and see what happened. There isn't even enough voltage to run one 12v light. So, I'm assuming the converter is toast. Are there any quick fix things I should look at before taking it in for warranty work? I didn't see a reset button or anything similiar. I really don't know anything about converters other than their function.
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Old 11-10-2005, 09:25 PM   #5
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Is there any DC voltage? Or is the light just dim? You might look for a circuit breaker/fuse in the AC distribution box. after all if you don't have AC going into the converter, you can't get DC out.
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Old 11-10-2005, 10:35 PM   #6
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If I read your SIG right you don't have a warranty on your 5-6 year old 5vr. As someone else has said look for the fuse between the battery circuit and the converter. Mine also has a fuse block up in the battery compartment and in the pin where the truck hookup cable is. The other thing to check is to see if you actually have not opened the battery disconnect switch and just forgot to close it back. You may still have a problem with your convertor even after all of this.
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Old 11-12-2005, 04:41 PM   #7
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You state you know your batteries are shot. Running the converter with shorted batteries places a huge burden on the converter. It could easily heat up a diode and blow it. Get a decent battery during this process.
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Old 11-19-2005, 04:01 PM   #8
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Not sure which killed which, but I replaced everything and it all works fine now.
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