Positive ground?

I did some research and it seems that reverse polarity batteries are easy to find in deep cycle marine batteries.  I wrote to the company that sold them and they said they were for applications where the battery would only fit in a certain way.  I think there is some other reason for it because batteries are the same dimension regardless which way you insert it in the battery box and if the cables don't reach you can get longer cables.  I see no reason for a reverse polarity battery and a google search only turns up items about people that charged their batteries backward.  There has to be a reason for it but the vendors of the batteries excuse makes no sense.  It's one of those imponderables in life I guess.

Originally posted by furpod Actually, Black Hot, White Neutral or GND is normal. All the red/black/blue etc etc is just user preference. Go open any piece of 2/1 Romex. Black, White, Bare or Green. There are some "standards" for colored wires, mostly on multi-pin connections, like your 7 pin. While there are still a few positive ground systems in the world, unless you own a vintage British car or motorcycle, and a couple BMW motorcycles, also vintage, you are VERY unlikely to have to deal with it. As long as cable "X" goes from the + on the battery to the "POS" clamp on the 12v distribution panel and Cable "Y" goes to the "NEG" clamp. It's all fine.

I think the black/white/green is standard for AC circuits with 10/2 or other gauge romex. Other colors come into play with wires having more than one phase.

I will bow to your "older guy" wisdom, having only been retired 20 years, I am still a youngster.. But, anyways.. having worked on a BUNCH of pods over the years, and a couple Airstreams, and now a Lance, they were all wired Black and White from the batteries. Maybe because on a TT you have both 120v and 12v, so they follow the 120v convention, I don't know.. but I fully agree that a DVM is a MUST have...

But also, having been to the Pod birthing grounds a few times.. I know that "Bob" uses "what is at hand" for a lot of things.. LOL So seeing a different or odd color wouldn't surprise me much.

I get the idea of the polarity of a normal battery being reversed.  As Mike said, it's very rare and pretty much requires someone isn't paying attention.  The positive terminal becomes negative and the negative terminal becomes positive.  I don't understand how in the world anyone could even make a reverse polarity battery for sale though.  Unless that means having the + on the right front instead of the left front so the cables will reach the appropriate terminal.  (Why not just turn the battery around?)  On these alleged reverse polarity batteried the positive terminal is positive and the negative terminal is negative.  Right?

I used to have an old John Deere tractor that had a positive ground.  You just had to connect the positive cable to the block and the negative cable wherever it was supposed to go (voltage regulator?).  You didn't need some kind of special reverse polarity battery.

TT

Originally posted by Tars Tarkas  I used to have an old John Deere tractor that had a positive ground.  You just had to connect the positive cable to the block and the negative cable wherever it was supposed to go (voltage regulator?).  You didn't need some kind of special reverse polarity battery. TT

It's just where they ran the wires. On our tractor the wires won't reach if I use a "normal" polarity battery. So I use the -R equivalent.