Bad ground or exposed wire somewhere?

If it consistantly happens at certain RPMs, I could only be the alternator correct?

2000 CSVT #1172 of 2150 Toreador Red Birthday 1/4/2000 *Drop in K&N/FMS Wires/AutolitePP Plugs *Sylvania SilverStar/Indiglo Gauges *Pioneer Premier P730/Sound by Audiobahn *White HVAC Panel/Elky Mesh Mod/35% tint