See Figures 1, 2, 3, 4, 5 and 6
The fuse box, on trucks through 1984, is located on the left side of the engine compartment near the windshield.
On 1986 pick-ups, the fuse box is located under the instrument panel, on the left of the driver.
On 1972-76 models, there is a 40 amp master fuse located underneath a plastic cover on the right-hand fender apron in the engine compartment, just behind the battery tray support. To replace it, first disconnect the battery ground cable. Then remove the plastic cover and the fuse.
1986 trucks have a master fuse block located under a protective cover on the right fender apron just behind the battery. This fuse block contains a 30 amp and an 80 amp fuse. The 30 amp fuse can be removed without disturbing the fuse block by simply pulling it out and pushing a new on in. To remove the 80 amp fuse, you'll have to remove the fuse block, remove the cover, unscrew the wiring terminal and pull out the fuse.
The master fuse(s) protects the entire electrical system; all systems will be dead if it has blown.
1977-84 trucks have a fusible link instead of the master fuse. The fusible link is a length of wire specially designed to melt under excessive electrical loads. It protects the entire electrical system. Replacements are made by splicing a new section into place. To replace the fusible link, first disconnect the battery negative cable. Then remove the old link and replace it with a link of similar capacity, available at your dealer.
When a fuse blows out, inspect the electrical system for shorts or other faults. Fuses of specified capacity should be installed in their respective positions. Oversize fuses will allow excessive current to flow and should not be used.
Spare fuses should be kept in a vinyl bag in the glove compartment.