Tail light fuse keeps blowing

Terry: It's obvious I'm not dealing with a USA spec car, however, I had lived in the U.S. Virgin Islands and am quite familiar with the Bluebirds of the past. Nissan still uses the same basic circuitry designs as far as what circuits serve what. Here are the circuits to look at.
All lights which are switched on by the headlight switch. This includes the Cigarette lighter back light, radio light power supply, automatics have shifter back lighting as well as your climate controls and all dash lights. Your side marker lights are also served by this circuit. The dash lights go through a type of dimmer switch which essentially creates resistance, thus dimming the lights. Sometimes the clocks are tied into the circuits. Start with the simple things first and work your way in. There is a type of fuse called a circuit breaker which will plug into the fuse block in place of the fuse.
Get the same rating as the one you pulled out. DO NOT USE A JUMPER WIRE AND LET THE SMOKE OUT OF THE WIRES!
If the circuit breaker blows immediately, you have a serious short!
With the circuit breaker, if the short is not real bad, the lights will burn for a little bit before the breaker blows. Once it cools, it will close and the circuit will operate again. While it is in operation, you look for the lights that operate and the ones that don't. Check the ones that don't. Although it's rare for a bulb to cause a fuse to blow, it does happen.
I often find problems are due to radio installations or other types of installations. So if you don't have a factory radio or if you have some type of accessory which has been installed in the console or dash, this would be a prime suspect. Nissan's are not really known for electrical problems unless they have been in collisions. If your car has been in a collision, look in the area where it was hit. You may find a pinched wire or damaged insulation. I am not quite sure what model your car would compare to in reference to a US car.
The Bluebird's were 510's. Are the Maxima's now? What ever model it is, unless it has no sister model imported to the
USA, the odds are that the circuits are going to be real close if not identical! I hope I have been of some assistance. Let me know.

I had the same problem, the black wire on Nissan's wiring harness is not a ground it is the illumination wire. After it blows the fuse it uses it as a ground and the radio will work. I ended up making up my own ground and it works fine.