[jhv48]

So, under normal driving, with the lights and fan off, is the ammeter needle to the right or left of the center mark? It Should be slightly to the right (the plus side). If it stays to the left of center, then your alternator/regulator is not functioning properly and you're running off the battery.

If not, and the needle goes to the right of center when the fan and lights are all on then it's wired incorrectly. It should be slightly to the left of center when all accessories are on and the engine is running.