Alternator wire to battery
 

So Im looking up more info on the electrical. As well as strategies with capacitors and voltage stabilization I see things on the big three. I already have a grounding kit that made a huge difference but I know with audio upgrades a lot of this stuff comes in. This is more performance for me since I dont have too demanding electronics but I'm looking to make sure my cars electrical is flowing as smoothly as possible.

Should I connect the alternator directly to the positive terminal on the battery (with an inline fuse)? Or is that more for stereo upgrading?

upgrading the wire from the alt positive to the battery positive reduces resistance in the circuit which reduces voltage drop. it should be fused at the battery.

This is a good all around upgrade then, not just for stereo systems?

And what amp fuse should i use- What the battery is rated to or a little less?

fuse size is always determined by the ampacity of the wire.

fuses protect in two ways
1. overcurrent (protects wire from melting an causing a fire in the event of over loading)
2. short circuit (protects the battery from exploding in the event of a short)

Yeah, I dont want my battery exploding. I looked in my cars circuits and saw the connection from the alternator to the battery was 80 amps. I'm assuming an 80 amp fuse in direct connection is my best option?