where is the fuse gearbox for the transmission 1993 XJ6

Hello, I'm not aware of any gearbox fuse specifically. I would not ever suspect a faulty transmission control module. Are you certain the transmission has an electrical concern? What specifically is the symptom you are experiencing?

If your battery is old get a new one it should fix the problem. This happened to me. I replaced the battery and it reset the computer and it never came on again