Fuse box diagram for a 1991 jeep comanche

SOURCE: Need diagram of vacuum system for 1988 jeep comanche pick-up 6 cy

Haynes manual has a diagram. Main important hookups are to power brake booster, fuel pressure regulator and map sensor. also need a connection to a/c controls inside drivers compartment and evap system canister. will also need connection to egr valve solenoid if you have one. as well as pcv on valve cover (or ccv which replaces pcv on some)

SOURCE: schematic diagram Jeep 1989

This link should provide all the diagrams you need http://www.google.com/search?q=1989+jeep+comanche+wiring+diagram&sourceid=navclient-ff&ie=UTF-8&rlz=1B3GGGL_enUS249US254.

SOURCE: Break Lights won't come on in my 1988 Jeep Comanche

Why replace the whole fuse box? That's rediculous. If you can't find the fuse box, just fix the affected circuit. Did they check the brake switch?

SOURCE: need wiring diagram for 1988 jeep comanche 4x4 6

check the solenoid on the starter it powers the ign for starting then switches to run when you let off key,either the solenoid is bad or a wire to the solenoid has come unhooked and sometime they have an in line fuse which can blow.

SOURCE: 87 Jeep Comanche, turn signal issues

You will find that there are two flasher units on the fuse panel. Turn on the four ways to identify which flasher serves that circuit. Then, move the flasher to the other position (where the signal flasher is) Your directionals should then work. You then can buy another flasher and install it when you have a chance, putting it in the 4 way position. The 4 ways get used so infrequently, you always have a reliable spare signal flasher there!