Rear lights on my Infiniti J30 do not work.

see if going to this link helps you out.
can not find the fuse for front door lock in 1995 infiniti J30 Google...

Driver side foot area on the left next to the parking brake open the panel and a diagram is on the cover showing you where the fuse is for the radio.

do a pin test on fuses one of them is blown! look in your service manual for loction

No it will be fine, but have you checked the brake switch that is right below the brake pedal?

replace the brake light switch, it is located above the brake pedal, u will need to remove the trim panel under the dash to see it.

the brake on off switch behind the brake pedal has a return spring and the spring might be bad. out on a new brake on off switch

You may have checked the connection on your battery, but you also need to check the other end of your negative connection to the battery, (the end connected to the body of your car), chances are it's a bad connection and needs to be cleaned.

Sounds like it could be a short in your wiring. Or else it could be a fuse. Start there, check your fuses~~~

It depends on what parts you're thinking of. Some will carry over between years, and some may not. Minor restyling on the exterior and lighting may present some difficulty, and the 96 is an OBD2-emissions controlled engine, so its ECU, engine bay harness, and many sensors may not work on the earlier car (which is the much less-stringent OBD1 emissions control).

I've only had experience with struts, running lights, trunk gaskets and various under-hood brackets; so far everything has been interchangeable. It may not look EXACTLY the same, but it fits. Hope it helps!