Although they are simple set ups I believe they aren't easy to fix once broken. It will need to be replaced. With an original that would be relatively expensive. However, a small portable separate one would be cheap and would measure any other batteries too.

Red and Blue Army!

I think wiring one in is simple enough but what I was talking about is just buying a small portable one from a DIY place, or Halford (sh1t I know) and using that. There are a couple of issues with fitting or fixing the original one. There's actually a whole set of things about wiring and resistance that will change your readings. If you buy a small separate one, you won't have to worry. A decent one shouldn't be too expensive and you can get one as accurate as you like, and use it on other things.
Another obvious thing is looking it up online. I presume you have 'googled it'. It reminds me of when I went on to caravan World website for something, can't remember why. Who was the first I saw on it? Somebody like Hambo or Midlands Eagle was the mod there. We do get around.

Red and Blue Army!

Thanks for all your replies guys, its much appreciated. Its good to know the premise of the various rules to bear in mind, however ultimately after reading up its ni on impossible to know exactly the remaining capacity of a battery. The readings on the meter can indicate a few things, depending on the wiring method. Talking of which, I may need a portable tester just to test how the onboard meter was set up (inline with nuetral or live). Another thing that may allow me to bypass having to fiddle with the above and purchasing both bits of kit is by using the little usb charging display that plugs into the cigarette lighter socket. Thoughts on this? Not sure on their reliability or where the socket runs off of mind you, just that its mounted above the fridge! Cheers guys

1/6/2010.a new era.we made it everyone!!!lets get the ball rolling for another 105 years of proud history.thank you cpfc2010.

palace forever.eeaaaaaaaaaaaaaggglless!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Belated replies! So my usb 12v reader now makes sense to me thanks to a friend of mine giving me a battery capacity % > volt reading chart...sure this does not equate for time or what individual devises draw, but it is a pretty solid indicator.

So, I cant remember what I'm hitting with my engine on but its significantly higher than the 12.4 with it off. 12.4 is something like 60% capacity for the leisure battery. Its dropping to 11.8 after a few hours of our 12v fridge being on, lights and stereo etc so could probably do with a new one.

I know the above probably has a few "but ifs" and "grey wires" but I think its a good basic start for me to understand what im working with.

What I am now stuck on is the inverter. I went to use a designated 235v 600watt microwave and it couldnt fully fire it up. I think this is another indicator that the leisure battery needs replacing, I might for fun take some readings and do the maths as per the kindly laid out OHMs law post above, just so I keep the understanding going and dont waste money.

As for the original meter in question, my sparky friend has told me its a rudametary ammeter, ie shows when something is being drawn, or not. On the face of its pretty pointless, what's weird though is its pretty comprehensively wired, possibly has something to do with showing when the 130v caravan hook up is in use? I'll have a think/play!

Thanks for your help, much love and UTP.

Raw

1/6/2010.a new era.we made it everyone!!!lets get the ball rolling for another 105 years of proud history.thank you cpfc2010.

palace forever.eeaaaaaaaaaaaaaggglless!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I would be tempted to replace the unit. Should be easy enough to take out and replace as long as you remember which wire goes where. The give it a little test at home. These like most electrical kit will either fail pretty much straight away or give long service. If you are not comfy doing it, look for a local caravan supplier they may fit it for you.