Amp hour meter wire run...

Are these leads from a shunt to a remote meter? The vast majority of the current to be measured goes through the shunt; only a tiny current goes through the meter. For an analog meter, it would be something like 50 micro amps. Less for digital. The voltage drop in the wire to the meter is proportional to this current. A very light gauge wire, such as you would find in a telephone or computer network cable should be fine.

If you really mean an amp-hour meter, then you are talking about a Bogart Trimetric or a Xantrex Battery Monitor. Then the answer is no. I used to install these all the time before the depression, and sailboat batteries are never near any display can be.

If that is not what you are thinking about come back with a better description or an actual maker and model number.

Matt

No.

Firstly, I think you mean ammeter in order to read amps? "Amp-hours" isn't something you'd normally measure.

Assuming you mean amps, if you add to long a run or use too small a gauge wire, if you add enough resistance to the circuit (and cause voltage drop across the new wire), there will be less current flowing through the circuit.

If a relatively short distance, always keep the wire the same gauge as what's there. Wire length will be much more important at 12VDC. For longer runs, use heavier gauge wire. Not knowing if you are taking about 120VAC or 12VDC, and other details like current level and length of wire, it's not possible to recommend what to do. Are you talking about a digital ammeter or analog? I assume you mean within your camper?

ps: I sure hope this is'nt some kind of trick question - it's too early in the morning.... :S

12 volt - any type of long wire run might have an impact due to loss. Heavier gauge wire will help a lot. 120 volt - not so much.