[2.2 Straight six]

I will at some time be buying a truck (once i've moved) which will most likely be an '01-03 F-150. i want to add spotlights to both the front and also on the roof, as well as a lightbar. i figure to run between 6 and 8 spotlight and also a lightbar (although it'll rarley be used) i'd need a more powerful alternator to cope with the increased power demand.

what i'd like to know is firstly, will i need a higher output alternator?

also, what kind of output would i need (amperage)?

and finally, if i install a higher-output alternator, will that have any negative effect on the truck when the lights aren't being used? will it cause fuses to blow or cause circuit damage?

Thanks,
Chris.