If you have a factory amp gauge, the alternator output needs to connect to the horn relay rather than the battery and any added load like elect fans etc. also need to connect to the horn relay. Wired as such the factory amp gauge will indicate charge when current is flowing from the alternator - horn relay to the battery and will indicate discharge when current flows from the battery to the load. The amp gauge doesn't indicate the current that is generated by the alternator and being used by load connected to the horn relay.
If it's an aftermarket amp gauge I agree with Big James 4XL, go with a volt gauge.
Right now I believe we have the Alternator wired directly to the battery. Is this a problem? I will check it when I get home tonight, but I am pretty sure that is the way we have it. This is with a factory Amp Gauge.
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