The way to wire a amp meter is easy...you just need to wire it in series with the + ou - terminal cable that goes from the alternator to the battery...
Never plug in parallel!! Always in series....
So this is what you do...disconect the alternator + cable...or cut it in between...hook up the side of the alternator cable to one side of the amp meter and conect the battery cable half to the other terminal in the amp meter...
Let me sum it up...i didnt explain it well...
Your amp meter is like a bit of cable...imagine you have a positive wire....that charges you battery...it goes from the alternator to the battery straight...now imagem you cut that cable in half...you open the circuit...if you hook up each half to each side of te ammeter, you will be closing the circuit...and all current that flows from the alternator will show on the amp meter...
If you still dont get it...read about connecting stuff in "SERIES"...and you'll get the picture...that is how i hooked up mine im my 120Y...
Peace...hope i helped....
ps: here is a pic...i took it off the net...is not in no car...just and example how to connect this...the ampmeter is in series, the volt meter in parallel...maybe it will explain it better...
