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Date:         Mon, 6 Aug 2007 17:19:13 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Attn: Electrical Gurus. Wiring question (diagram supplied)
Comments: To: David Kao <dtkao0205@yahoo.com>
In-Reply-To:  <811349.86737.qm@web82709.mail.mud.yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1

Thanks David.

I wondered what would happen.

FWIW, the 12V DC "shore" source is 110 AC to 12V DC using an AC adpator. (wall plug)

I didn't note that in the diagram. My bad.

Still, I'm doing it wrong.

Thanks for help.

Neil.

On 8/6/07, David Kao <dtkao0205@yahoo.com> wrote: > Neil: > > It looks to me the internal fan will see +12V from either home or shore > battery depending on the position of the DPDT switch. > > If the rear fan switch is closed (conected) you will not get 24 volt. > It will still get +12V from either the home or the shore battery. > But if it gets +12V form the shore battery (through the DPDT switch) > and the thermal switch is closed at the same time it will put both > batteries in paralle, meaning it shorts the +12V leads of the two > batteries. This is a problem. If one battery has a higher voltage than > the other there will be current flowing from one battery to another, > which is like charging the of a lower voltage. It may not cause > any damage to anything if the voltage difference between the two > batteries is very minimum. But if the difference is not very small > It would be like shorting a voltage of the difference, which could > easily burn the wires or the switches at the moment they are connected. > > Batteries should never be connected in parallel. > > David > > > > --- neil N <musomuso@GMAIL.COM> wrote: > > > Hi all. > > > > The diagram: > > > > http://web.mac.com/tubaneil/iWeb/Site%205/DometicWiring.html > > > > Fans work properly from both power sources. Internal is switched at > > DPDT, and rear is switched dependent on power from DPDT. > > > > IF thermal switch went "on" AND power still "on" from either source, > > will rear + internal fan see app. 24 volts if "rear fan switch closed? > > Or are they in series? (remains app 12V) > > > > Many thanks, if anyone can answer! > > > > Neil. > > > > -- > > Please send me your Vanagon/Westfalia links! > > http://vanagonlinks.googlepages.com/home > > > > Neil Nicholson. 1981 Air Cooled Westfalia. > > http://web.mac.com/tubaneil > > > > > > ____________________________________________________________________________________ > Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center. > http://autos.yahoo.com/green_center/ >

-- Please send me your Vanagon/Westfalia links! http://vanagonlinks.googlepages.com/home

Neil Nicholson. 1981 Air Cooled Westfalia. http://web.mac.com/tubaneil


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