Having problems with your 1985 Honda Prelude ?
1985 Honda Prelude replaced alternator and regulator trouble shooting wires, battery light still comes on
I had an 84 Prelude with a similar problem. I will assume that the car runs just fine as though there is nothing wrong but has the light on. When this happened to me it was just a bad diode in the alternator. If the battery takes a load fine and shows good charge then take off the alternator, take it back to autozone or wherever you bought it and have them test it. I would bet there is a diode bad and they will give you a replacement. Good luck!
Repair Help & Product Troubleshooting for 1985 Honda Prelude
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