if you have a less than std dia crank pulley (7.25") going to a 7.25 will speed up the alt (& pump which is generally OK) & may or may not require a smaller pump pulley depending on the current ones' dia so a std (7.25) crank pulley will fit which will speed up the pump even more. I'd clean ALL connections/wiring. The easiest would be to relay the headlight directly to the alt which works very well (keeps the ammeter honest also) & there's no downsides to this (maintain good relays/wiring/terminals/connections). As said there are other alt options that charge better at idle.