Hi. I've looked through the postings on alternators but have just ended up confused. My 92 Legacy wagon has a 4 pin, round plug on the alternator. It has 4 wires attatched!. As it has been pronounced dead and I can not get one the same I was looking at replacing it with the later 2 pin one. Does anyone know exactly what the 4 wires do?. It runs perfectly without the alternator even connected so one wonders just what is needed...... Thanks....Michelle (New Zealand)