12 volt RV wiring guide - Fiberglass RV


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Old 12-30-2008, 03:52 PM   #1
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Here is a link to good site about RV wiring

http://www.ccis.com/home/mnemeth/12volt/12volt.htm
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Old 12-30-2008, 10:42 PM   #2
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Good website. Thanks for the post!
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Old 12-31-2008, 07:58 AM   #3
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The block diagram is wrong. The 12VDC fuse panel comes directly after the converter and the battery is connected in parallel with the converter.

In the block diagram, if the battery is disconnected there would not be any 12VDC.

Yes, It is important especially for the people who do not understand wiring.
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Old 12-31-2008, 08:21 AM   #4
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You could hook it up the way shown but as Darwin points out, if you did, removing the battery would stop 12v to the rest of the trailer.

In practice, the converter/charger and battery usually both go to common posts. + from the converter and + from the battery to one post on the fuse panel and likewise the negatives share another post on the panel. This is the parallel hook up that Darwin talks about. That way, removing the battery still allows the converter to supply 12v to the rest of the trailer. And it still allows the charger/inverter to recharge a battery when one is hooked up.

I believe, but I've not checked my set up, that the + and - from the Tow (when present) also hook up to the common posts as well.
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Old 12-31-2008, 08:34 AM   #5
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Personally, I'd draw the wiring diagram like so:

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Old 12-31-2008, 01:34 PM   #6
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[quote]Personally, I'd draw the wiring diagram like so:

Attachment 17352


That's the way I would hook it up as well, during the winter I remove my batteries I still like to work on the trailer when its not -50 below outside, having the lights work makes it a lot easier. The site has a lot of useful tables and other links, if you start at the home page it answers a lot of newbe (like me) questions.

Home http://www.ccis.com/home/mnemeth/tech.htm
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Old 03-15-2009, 09:01 PM   #7
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The block diagram is wrong. The 12VDC fuse panel comes directly after the converter and the battery is connected in parallel with the converter.

In the block diagram, if the battery is disconnected there would not be any 12VDC.

Yes, It is important especially for the people who do not understand wiring.

Hows it goin?? you seem to know your way around the 12V system. I have a question for ya. I have a 1979 Vanguard truck camper, it has a model MPC 300D converter. Now when im on shore power with no battery connected, should i still be able to have 12 V power??? Right now I have 120 coming in with outlets working, but lights and other 12 V stuff nothing. Do I need a battery to complete the circuit??? I would appreciate the wisdom. Thanks, Rick
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Old 03-15-2009, 11:07 PM   #8
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I believe some RVs ARE wired just like Nemeth's block diagram, in which case the converter doesn't power anything without the battery -- The battery is being used as a filter.
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Old 08-09-2016, 09:56 PM   #9
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http://www.ccis.com/home/mnemeth/tech.htm

its a dead link , any one know where i can find new link ?

thanks
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