Peterbilt Clearance Lights Wiring Diagram. Main cab harness dash start interrupt ignition switch firewall starter (357, 375, 377, 378, 379) wiring. It exhibits how the electrical. I have a 2005 387 Peterbilt. With. No high beam. And no reverse lights from www.justanswer.com (see interior lights system wiring diagram) late production. Start date nov 13 2012. […]