Not doing anything

The problem is not the fuse most likely but the reverse light switch on the transmission. If it is an automatic the reverse light switch is part of the large switch that sits under the cable that shifts the transmission gears you select. If it is a manual it is located on the side of the case of the tranny. The interior lights are on a different fuse, do they come on at the head light dome light switch? Has the bulb been checked. I do not have the owner's manual on file due to the age of the truck, sorry.

Great question. Could there be some thing else on dome light circuit? Horn etc? would need a schematic. Door switches switch ground for light?

You may have to check your ignition switch, also check voltage to and from ignition switch. Your instrument cluster should get voltage feed from ignition switch. Anything electrical, you want to check voltage and ground for that system.
Your starter motor circuit usually has two voltage circuits, one comes straight from the battery, hot all the time. The other circuit goes hot with key in the crank position and is wired through the neutral or clutch switch, depending on the tranny. The starter usually grounds through the engine block. You may have a starter relay? I haven't looked at your wiring. Any testing at the starter make sure tranny is in park or neutral and the parking brake is set.

Depending on mileage and care...100K+ could mean low on tranny fluid (1) dirty clogged tranny fluid & filter (2) wheel bearing worn/locked? If you think it is dirty/low on tranny fluid, try adding a bottle or 2 of Lucas Oil Transmission Stabilizer...works great without draining anything...try this first...any other symptoms?

didnjt i see this question a few days ago ,i think they blew a fuse connecting up a secondary power source by the sound of it

Did it do it under hard acceleration? or just a normal take off. I have heard of engine mounts or tranny mount bushings getting old (not mileage old but just aging) causing a thump or clunking sound in between shifting. What happens is the tranny actually hits the undercarriage of the vehicle during high torque situations such as shifting gears. I have also seen the mount retaining nut back off of the mounts and the only thing holding everything in place is gravity. Another possibility is drive shaft u-joint problems, but if it were it would probably be making the noise more often. I dont think there is actually anything wrong with the transmission itself as usually when they go bad they dont magically get better. Hope this helps. Good luck!

Had this before and i found a fault on the fuse board ,no supply the printed circuit maybe as i didnt go any further i just looped it from another fuse that had power via ignition switch through the radio fuse and it all worked but the fuse for the radio wasnt the one i looped as that had power for the memory it was another one that done the interior light and a thin bit of telephone wire done the trick so check all the fuses for power ,pull them out and check with a little 12v screwdriver light thing from the chinese shop ,right star trek is about to start goodnight

The mileage that you flush tranny depends on many factors. Do you tow anything, lots of city driving, in hilly terain, or in hot weather. Is so tranny probably need flush now. If most of your driving is on highway then you could go considerable further. Cost $ 60 - 100 is standard.

The wire that runs to the dome light runs along the carpet retainer on the floor of the driver door opening. It then runs up the "B" pillar and over to the dome light.
Have you checked the bulb and the presence of voltage and ground at the dome light socket?
I would start there first before tearing anything apart and make sure all is good.
Let me know.
Regards,

This is a good one. Get your hands on a wiring diagram. What you're looking for is a common wire that possibly links the radio, dome light, and defroster. You're looking for possibly a common power wire. Look for bad grounds under the dash. Mainly look for a common wire between the components. I have seen if one thing goes bad, it would effect things that you wouldn't think had anything to do with it. Honda is good about that.