Where is the headlight fuse on a 1979 cj7 jeep

Don't believe there is one for headlights. Your jeep is too darn old: I can see wiring diagrams going back to 1986 at a site, so I looked at one for an '86 CJ7. Unfortunately not a complete headlight wiring diagram, however, so you're getting a two bit answer, with inflation worth about 10 cents. lol.

The headlight switch gets power from a fusible link (Fuse link A) that looks like it may be located on the starter solenoid terminal- two fuse links- A & B, there somewhere. But this same fusible link A also supplies power to the fuse block with the park/tail lamps, hazards, brake lights, and a couple others. So if you have stop lights and park lights, then the fusible link is good, so you should have power to the headlight switch. Neither the fuse block, nor the instrumentation diagram, shows any fuses for the headlights. A lot of older vehicles did not have headlamp fuses, because the light switch had a built-in circuit breaker.

My guess is you have a bad dimmer switch, or the connection there may be bad. Or check if you have power to the headlight socket with the light switch on, and if you do, there may be a headlight ground problem.

as simple as this is going to sound its been my exspirence with the cj's they loose ground back at the light housing. try taking off the light and ill bet there will be some rust there. use a small peice of 180 sand paper to scratch off the dibris and reatach and you sould see the lights return. hope this helps and let me know. thanks and good luck.

the bell housing might be different

no installed fuse. you have fusible link, near the battery terminal, and a breaker, if your ligths cant on but light bulb is good, it is switch problem or the fusible link

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

Auto wrecker.

generally manual boxes have a square plug on top that you can remove and fill through, use a good grade of gear oil.

If all the fuses are good, try turning the dimmer and see if the lights come on dim. If the lights still do not work, it could be a bad switch.
I would check the headlamp switch with a test light.

If I'm correct there a fusible link for the headlights.
Probably of the starter solonoid.

check your fuse, if good check or replace headlight, if that is good then check the headlight switch, easy to change. good luck