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Bouncing Voltage Gauge

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Old Feb 6, 2019 | 06:32 AM
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Default Bouncing Voltage Gauge


Recently installed a LS1 in my 1987 944 turbo and immediately noticed the voltage gauge bouncing. Never an issue with this gauge in the past. I have done some reading online, but haven't found a ton of info on this issue. With the engine running, I am reading ~14.45 Volts at the battery terminals. Any suggestions other than checking all the grounds?
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Old Feb 6, 2019 | 09:49 AM
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If it's not the gauge and only does it with engine running, it's probably a bad rectifier in the alternator.
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Old Feb 6, 2019 | 08:15 PM
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Don't measure the voltage at the battery. It will smooth out the ripples. Measure it at the fuse box and see if an external gauge bounces.
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Old Feb 27, 2019 | 05:15 PM
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Thanks for the help guys, I think it was the rectifier. I sent it out to be rebuilt as a 1 wire (figuring the rectifier was shot anyway) and wanting to simplify things. Rebuilt alternator works great, the voltage gauge bounce is gone, shows 14.60V solid at the battery.
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Old Feb 28, 2019 | 04:57 PM
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I love a happy ending




Shoot. I should own the patriots.
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