[72k5ls]

To answer your question yes you can do it but I would put a fuse in that wire just in case. Every vechicle I have had I have upgraded the charge wire between the alternator and battery since I have installed fuel injection on most of them. The factory charge was ok for stock applications but when you add things like you did the factory charge wire is barely large enough to carry the load that is why it was getting hot since it was carrying alot of amps but it had high resistance which makes heat. The larger wire you installed can carry the load with less resistance hence it is not getting hot. All the grounds you have installed are not wasted it helps the electronics live longer since they are getting a good ground and battery voltage.