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Hey guy's, I've got a 2000 996 C2 Tip with 103k miles. Just replaced the alternator 2 weeks ago due to bearing going out. I never paid much attention to the voltmeter but before it would typically sit between 12 and 14V when driving. Well, I have been paying more attention and notice that when starting the car the volt gauge drops all the way down to about 10 then as the car starts up runs up to 14V. Car starts right up no issues there. I just wasn't sure about the voltage dropping that low. After initial 14V run car settles in right about the middle of 14 and 12. Last week I had to sit at a light for 30 minutes. Voltage went from about 13 (usual running) down to right above the 12. Is my battery going?

So can someone watch their volt gauge when they start and see if it drops down to 10.

Thanks

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Hey guy's, I've got a 2000 996 C2 Tip with 103k miles. Just replaced the alternator 2 weeks ago due to bearing going out. I never paid much attention to the voltmeter but before it would typically sit between 12 and 14V when driving. Well, I have been paying more attention and notice that when starting the car the volt gauge drops all the way down to about 10 then as the car starts up runs up to 14V. Car starts right up no issues there. I just wasn't sure about the voltage dropping that low. After initial 14V run car settles in right about the middle of 14 and 12. Last week I had to sit at a light for 30 minutes. Voltage went from about 13 (usual running) down to right above the 12. Is my battery going?

So can someone watch their volt gauge when they start and see if it drops down to 10.

Thanks

seems normal, what else was on while you where at the light? radio, AC, heater, heated seats etc. these will all make your voltage momentarily go up and down.

and i would check your battery to see if it is holding a charge using a voltmeter. but it is usual to see the voltage drop at startup, especially as it gets colder.... as long as it comes up right after the car has finished cranking and is running

Rod

Edited by silver_6r
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The radio, A/C, and headlights were on at the light. Temps have been around mid-50s here in the morning. So not real cold, beautiful weather to drive with the windows down.

Everything sounds right. While cranking the engine, battery voltage does drop to approximately 10V.

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