Ammeter works when key is off?

ricks70dart said

By running 10g wire from alt output to battery side of starter relay it then carries most of the load to charge battery instead of sending all through bulkhead connector were thing tend to melt down if Iam reading correctly.There saying to use a fuse link in line of 10 g wire

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Oh. I see.
My bad for not reading the article.
You might want to put in a volt meter just to better keep an eye on things since that would "bypass" the AMP meter for charging current, I guess.
Maybe hang a small one under the dash in front of your left knee.
You know, a some people have run a wire through the bulkhead connector and eliminated the Packard type blade connectors for that load you are talking about.
But that probably is more wiring than you want to do.

That meter melt down is a point of big debate.
I think as long as your connections are good and tight on the back, the AMP meter is pretty reliable.
That's my experience, anyway.