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-   -   What side of battery to isolate on chassis battery (https://www.irv2.com/forums/f103/what-side-of-battery-to-isolate-on-chassis-battery-108244.html)

ottffss 11-17-2011 09:01 AM

Quote:

Originally Posted by Qwert66 (Post 1011183)
...The longer dedicated positive starter cord may explain why its bigger vs the many ground connections and their shorter lengths.

And you would be exactly correct.

A phenomena of lower voltages like 12v is that "line loss" (due to length) can be exceptionally significant, especially under high amp draws. Hence the larger (and typically longer) positive cable (running all the way to the starter motor - the mega amp draw item).

skip - I am only trying to be technically correct and to provide the best information possible.

wa8yxm 11-17-2011 11:18 AM

Electrically it does not matter if you put it in the negative or positive leads. Either way when the disconnect is open there is not circuit to the batteries.

HOWEVER: if you put it in the NEGATIVE (Chassis ground) lead then you open the disconnect and remove before disconnecting the batteries from the coach.. now, if you are thinking (Which you won't be cause you'll be upset at haveing to buy new batteries... or at least that's your excuse) you will lift the Negative lead first.. But if by some chance you happen to lift the POSITIVE lead first.. and the wrench slips and shorts to chassis.. no damage. Since there is no "Return path" from chassis to battery.

Thus Negative is more then likely the better lead.

"007" 11-17-2011 06:51 PM

You will have a chassis battery drain from your LP detector if you do not operate the switch in your tank display area.
https://www.irv2.com/attachments/phot...icture_158.jpg
There is also battery drain from ECM and radio system you may have but small solar panel will help eliminate this drain.
It has never been necessary to add a battery cut-off, off any battery on Newmar coach it only adds a potential problem in the future.

Vegasguzzi 11-17-2011 07:35 PM

Dealer called me today and informed me they figured it out. They found a couple extra ground wires coming off the chassis batteries which were allowing current flow from one battery bank to the other. The cameras went out because of their cycling the electric so much and all they had to do was reset the monitor. Don't know what the final cost to me will be. Thanks for the discussion.

Vegasguzzi 11-17-2011 07:36 PM

I'll get my coach back in time to head to Ann Arbor for the The Game on the 26th. Go Blue!

"007" 11-17-2011 07:42 PM

DO not know how dealer found extra battery leads if he hooked up the same as original batteries were hooked up.
In Quick Tips there are pictures of different battery hook-ups and this thread will explain how your BIRD System works for charging all your batteries.


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