1988 GMC S.15 Fuse Box Diagram 1988 GMC S.15 Fuse Box Map Fuse Panel Layout Diagram Parts: over speed warning, cruise control, auto trans, rear defogger timer, clock, circuit brake, power window, courtesy lamp, dome lamp, 4wheel drive, lift gate release, I/P comp lamp, tachometer, rear defogger lamp, ashtray lamp, clock dim, rear defogger, power …