Cosworth 2wd alternator help!!!
#1
Regular Contributor
Thread Starter
Cosworth 2wd alternator help!!!
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.
#3
Regular Contributor
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Hi no got it for around £80. So wasn’t bad. However I removed the alternator last night and tested it and the alternator is working! However I believe because I am using fiesta clocks the battery light is the wrong wattage and causing incorrect power to the exciter wire. So will need to add a resistor
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#8
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The wire for the light is Earth when no power comes from the alternator, other side of light goes to switched live, then when alternator is providing power the wire becomes live thus the light goes out, this needs to happen for the alternator to work. Also make sure the engine has a really good earth strap or add another and make sure the earth is really clean.
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