not a problem, the valkyrie has the Goldwing alternator.
http://www.rattlebars.com/valkfaq/ALTERNATOR: OUTPUT: 546 WATTS & 14.2 VOLTS @ 3500 RPM
The Valkyrie is equipped with an honest to goodness alternator located under the plastic chrome cover (which says "HONDA") on the left side below the petcock. Born of the notoriously over lighted and accessorized Gold Wing and driven by a gear directly off the crankshaft, it has an output of 546 Watts and 14.2 volts at 3500rpm. Unlike many motorcycles, once started your bike will run off the alternator alone without the battery in the circuit, but it's not a good idea to do so as the voltage drops at idle. This alternator is a strong beast (like the Valkyrie) so turning on your high wattage headlight, running lights, spotlights, custom lights, radio, CB, heated clothing and your cappuccino machine will probably do nothing more than make it proud of itself.
The alternator will whine a little but if it "squeals" then its bearings might be going bad. If it "clacks" then the brushes can be worn. Have your dealer check it with a stethoscope and test output for the condition of the stator and brushes. This is a rebuildable item and frequent inspection can save you a $600 replacement fee. If you've deadened the sound by spraying Quiet Kote or Duplicolor Rubberized Sound deadner spray under the cover, every now and then listen closely because your alternator could be telling you something.
For the curious, here's what I run off the stock alternator:
100/90 headlamp
twin 35 watt spots
twin 55 watt Lazer Stars
two 1157's up front (TS & running)
two 1157's on rear (ditto)
two 1156 for custom under lights
two 192's in the instruments
EIGHTEEN 192's for lighting the engine
FOUR 4" strobe lights
one NEON under the swing arm
one 1157 tail light (run and stop)
one (forget the number, but it's a high watt courtesy light from a car) to light the license plate
another one of those as a second brake light
one 4" Signal Dynamics LED for another extra brake light
two 192's to light the side of the tail light under the Highway Hawk cover
one 192 under the bar clamp to light the clock
SIX license plate bullets in various places
Heated gloves
Heated Jacket liner
Heated socks
