Rick,

I have enclosed a link to a wiring diagram of the truck with a five fuse box. The power to the box is not switched with a ACC function on the ignition switch....I don't even know if it had a ACC position.

The fuses are for HI, LOW (hdlts),PARK, STOP and TAIL. I think these circuits were always powered, or in the case of the headlights, powered when the headlight switch was pulled ON.

http://chevy.oldcarmanualproject.com/electrical/wiring/images/49ctsm1202.jpg


Stuart