Nissan Repair: Electrical fault, auto electrician, starter solenoid

Question
Hi, I am thinking of buying a 1988 Nissan pulsar Q as a project car, or to use for parts for my own pulsar. The guy that owns it said that it wont run or crank over, he thinks this is due to the main fuse being blown, which he cannot find. I would like to know; where is it, what it looks like, could he mean the inhibitor relay? It hasn't been driven for about 6 months, and the only thing that does work is the rear demisters and the wipers. He had the ECM checked, and it works fine.
Any help would be greatly appreciated,
Thank you

Answer
If the motor does not crank the first thing we do is to check the battery of course. The battery should retain 12.6 volts in order for the starter motor to spin. Make sure the battery cables are clean and corrosion free and tight. Make sure the ground cable is mounted properly. With a self powered multimeter check the battery voltage and record the reading. After that, connect the multi meter to the positive cable of the starter motor. It should read the exact same voltage. If not, the cable is corroded or loose. If there is voltage on that terminal, connect a test light to the starter solenoid terminal and have someone turn the key to start/crank position. The test light should illuminate but if the starter does not turn, then it had failed and it needs to be replaced. If there is no voltage anywhere in the starting system, remove the cover from the fusible links and relays in the engine compartment. Look for a burnt out fusible link or a fuse that looks different in shape from the normal fuses. If you locate one that had burned, then there is a short somewhere in the electrical system. Sometimes is the alternator that causes this problem. I recommend an auto electrician, since he has the tools and the knowledge to run these tests.