Ammeter works when key is off?

I'm thinking that solenoid draw is not a big concern.
That's a temporary load, right?
Do I understand your question?
(Did not read the article)
Do it and fuse it if you want to.
The "Headlight Mod" is much more important.
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