Location and description of fuses and relay Chevrolet Silverado and GMC Sierra (1500, 2500, 3500) with engine 4.3L V6 (Vortec 4300), 4.8L V8 (Vortec 4800), 5.3L V8 (Vortec 5300), 6.0L V8 (Vortec 6000), 8.1L V8 (Vortec 8100) and Diesel 6.6L V8 (Duramax) (2003, 2004, 2005, 2006)