Where is the main fuse located in a 1983 jeep ?

The IOD fuse is located in the IPM (Intelligent Power Module - a fancy term for the main fuse box) which is in the engine compartment right next to the battery.

https://www.chryslerminivan.net/threads/what-is-controlled-by-the-iod-fuse.22096/
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Check the ignition fuse and the ballast resisitor. Most Jeeps had these on the firewall. Looks like a
square knife sharpening stone about 3" long with electrical connectors on each end.
Just replace it, they are cheap. Check with Oreilly's or Autozone for info on the location
of any ignition fuseable links. These are inline fuses that are sealed in a wiring harness
or simply look like a plastic nub in the middle of a wire.

If it's an inline six cylinder the location is in the driver's side, on the engine head by the fire wall.

At your brake pedal follow the arm up and you will see a switch on a bracket.

ok its easy, first see the stereo installation diagram, but i think its have spare wire harness, try to find it. inlay your wire in secured area, dont forget to install fuse in acc and in hot at all time(constant 12V)

1986 or 1983? if 1986 need to know if 4 cyl or 6 cyl engine

The fuse panel is located under the hood on the driver's side

does the main yellow wire have a fusable link in it, if so it might be blown,

Try to change the motorcraft module box located on the inside fender well on the left side.

You need a Chiltons or Haynes manual