Wondering if I need to do this. I was driving the 83 home today, and braked to stop for a traffic light, and the charge and brake indicator lights flashed on and off. Was running fogs, headlights, and heater at that time. It doesn't do it all the time, just randomly. The car is an 83 with a 6MGE, so the engine does have the multi rib belt pulley system. I changed the alternator less than a year ago, and figured I would have to do the mod, but the lights never came on, so I didn't change anything. So almost a year later, I am starting to get this random flash of the indicator lights, hope it's not a bad alternator again, because if so, I'll be looking to go with something else if I have to change it again (either a 7mge, or Camry alternator) because the alternator issues are getting old.