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Old Jun 22, 2022 | 02:25 PM
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While not so strange, I pulled my top off to adjust the rear latch and found the set screw not so unsurprisingly stripped. I suppose there is no EASY way OUT of this. Now for the strange occurrence. I drove the car at night for the first time Friday evening. Lights appeared to work normally and vision was adequate. I noticed as I stopped at a traffic light, the headlight beam seemed to change to a downward focus. Same thing as I braked for stop signs. Once I began moving again the focus was normal. Is there some sort of sensor that causes the headlights to perform that way? It was not random. At every stop sign I stopped at, it was consistent. Yes, I read the manual but it shed no light (sorry) on my concern.
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Old Jun 22, 2022 | 02:32 PM
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Does your system voltage remain constant during normal lighting and downward-focused lighting?
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Old Jun 22, 2022 | 03:09 PM
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Checking the voltage is a good idea, but not from the gauge. Use the DIC. The OEM alternator can barely keep up with the rad fan at idle speeds. Add in the full headlighting system, brake lights, and HVAC fan, you are in a drawdown condition. You would likely notice a 2 or 2.5 voltage drop.
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Old Jun 22, 2022 | 03:57 PM
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Interesting. I wasn't paying any attention to voltage but do the lights go dim or completely dark in a voltage situation? And regain brightness at an RPM increase?
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Old Jun 22, 2022 | 04:15 PM
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Originally Posted by DEFCON5
Interesting. I wasn't paying any attention to voltage but do the lights go dim or completely dark in a voltage situation? And regain brightness at an RPM increase?
Yes, the lights can go dim when voltage drops. If you can confirm voltage drop when RPM drops, it could be caused by one or more of these things:
1. Battery going bad
2. Alternator going bad
3. Someone may have messed with the pulley size of the harmonic damper and/or alternator.

The stock alternator is marginal anyway, so it will be sensitive to any extra load or system deficiency.
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Old Jun 22, 2022 | 04:26 PM
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Originally Posted by DEFCON5
Interesting. I wasn't paying any attention to voltage but do the lights go dim or completely dark in a voltage situation? And regain brightness at an RPM increase?
Yes, and to make the situation worse, not only is the alternator struggling at idle speeds to keep up, but as it gets heat soaked, its internal resistance increases, so its output drops even more. A double whammy.
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Old Jun 22, 2022 | 05:22 PM
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Funny. I was getting a bearing noise when I first bought the car a couple of months ago. I bought a new alternator but the other one stopped making noise and seemed to be consistently above 14 volts during the days I drove it. I've been driving around with the new one stored in the back well in case of failure. Maybe it's time...
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