1989 244 manual tranny. Been running a 100 amp alternator from a 740 for the last 10 years. I was changing my HID lights and had a bulb short out. I right after that I noticed the battery bulb was lit. I had no fuel or temp gauge and the tach was not working. I drove the car and noticed that the speedo was jumping up and down. My volt meter gauge showed that it was charging. The next day everything was normal. Today it was back to the battery light illuminated, the gauges and tach not working and speedo jumping again. But still the volt meter read a charge. Is this typical of a bad alternator or maybe bad diodes in it? Thanks for any help you can provide.
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