on my 99 ranger the wipers will randomely go off while im driving, does anyone know why this happens?

i had the complete opposite happen on my '94 i use to have. ended up being dirty contacts in the wiper switch

Little gremlins like this are usually linked to a failing ignition switch.

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Current Mods
White gauges and Temp Cntrl, OHCw/Buggman LED mod,
Bosch +4, Accel Coil Pack, MSD6AL, Walbro, HiFlo Fuel filter,
Custom Ram Air, K&N, Ported / Matched intake, JBA 9mm wires,
Tweeked FPR, EBC 6k's, DynoMax-S CatBack, Jet-Chip, Reflex shocks,
New Anvil Mounts, Timbren's, Optima Yellow, DB 220A Alt. w/4g. jumper,
Western snow plow, More2Come