Is it a positive from the battery and a negative from the black terminal of the generator? Does anyone have a diagram then can post of send me?
Thanks
Raf

Raf,
If you insist, see:
http://www.houlihane.co.uk/amps.htm 

However, since you'll be adding another possible failure point (the ammeter) in series in your charging system and since you have to run heavy duty cable through your instrument panel, a voltmeter (which connects in parallel using light gauge wiring) is generally a better option for monitoring your battery condition.

hth

You are right. I just read more about them. Sound like a pretty risky thing to have. I asked because there is one in the car already and I thought I might as well hook it up. I will toss it and get a voltmeter
Thanks

Yes,
I have a few new ammeters but have never used one..
I prefer the volt meter..
they are usually good in showing Voltage Drop

Ammeters are Ok in front engined cars where the battery and alternator/generator etc are all close to the dash....

cheers

Lee

You get a much better idea of what is going on with both, but it really isn't needed - cars are pretty simple. You can use an ammeter with a shunt to reduce wiring problems.