Cell phone charging

[Russell Reay]

I followed Paul Shinn's video about installing a cell phone charger using a unit from Amazon https://www.amazon.com/dp/B0D4YSHSH3...sin_title&th=1. It is described as a 12V cigarette lighter and power outlet, and says it comes with a 10 amp fuse, but this is the one that came with it. As nearly as I can decipher this is a 3 amp fuse. The symbol before the numeral 3 appears to be something that didn't stamp completely in the factory, but that is what it looks like. I have this connected to the ammeter and grounded in common with the turn signals. I am using red for power--neg, and black for ground--pos. Paul's video shows an in line fuse, but he doesn't state its size. I can splice in a different fuse holder, but what size should I use?