i need a schematic, i'm fixing a guitar for a friend

heres the setup:
two humbuckers, one 3-way switch, two pots
whoever did the wiring on it last severly ****ed up
the 3way switch does nothing, both pickups are on at once.
both of the pots have been wired as volume controls
now you might say "well to choose your pickup just turn one down and one up"
well it doesnt work. all it does is turn the sound off

so can anyone help me?