Hi. I purchased a new genuine Cosworth alternator from eBay. I have put it into the car however it won’t charge! The engine is in a mk3 fiesta. Battery relocated too the boot. Thick cable runs from the batt to the starter then from the start to the alternator. I then have the exciter wire connected to “Off the top of my head “ D+ ? Turn the ignition on and the battery light comes on on the dash. And exciter wire has 12v at it. Start the engine and nothing! Battery light stays on and alternator is giving 0v. Any ideas ? Or is it just a faulty alternator ? Thanks.