Prism have not got standard alternator then? never tested mine to see what it's like but last thing I want to do is blow £250 on a screen to ruin it.
I think mine is from a forklift. Only 50A output, seems to get red hot after a session on track, and higher than normal voltage on tickover but i'm not sure if thats just a dodgy reading from my cheap multimeter.
I think all in it cost around £300-£330 for the screen, delivery, VAT and someone to fit it.
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Goldie the track car.