Maybe he doesn't have any problems at all.
Maybe he just bumped the voltage regulator fuse and it blew and he didn't notice it. Then, if that happened, he effectively has no charging at all. And
maybe those new lights only draw 15 amps and his existing alternator is plenty good enough and he could move the source over to the hot side of the #1 fuse holder and everything will work perfectly and he won't have to do much of anything....
