My battery is good and so is my alternator - TerrainForum.net: GMC Terrain Forum
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post #1 of 16 (permalink) Old 09-15-2019, 07:06 PM Thread Starter
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My battery is good and so is my alternator

My battery won’t charge above 12 volts. I thought it was the alternator took it off and had it tested at both oreilys and autozone. It turns out the alternator is good. The battery runs down as I drive and has to be recharged to drive. Not really sure what to check next any advice would be appreciated
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post #2 of 16 (permalink) Old 09-15-2019, 07:51 PM
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Unless you have a big drain on your electrics (not very likely) or the Battery is just bad, it happens quite a bit. You got the ALT checked, so the next thing is the Battery. Good luck with it
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post #3 of 16 (permalink) Old 09-15-2019, 08:24 PM
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Can you give us a few more details... Year ? Engine ?
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post #4 of 16 (permalink) Old 09-15-2019, 08:49 PM Thread Starter
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It is 2005 equinox with v6
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post #5 of 16 (permalink) Old 09-15-2019, 08:54 PM Thread Starter
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It also says 3400 sfi on the top of the engine. I would like to figure this out without having to take it to a mechanic so any help is appreciated
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post #6 of 16 (permalink) Old 09-15-2019, 09:37 PM
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How do you get the car started? Do you boost it or do you charge the battery before starting? If you charge the battery at night will it start in the morning without a boost? Have you checked the fuses in the under hood fuse box? There are often 1 or 2 fuse in the fuse box that protect the alternator and its wiring.
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post #7 of 16 (permalink) Old 09-15-2019, 11:30 PM
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Is the drive belt tight? Maybe a bad belt tensioner. Rare, but you never know. But I'd more suspect a bad circuit between the alternator and the battery, fuse, dirty connection, etc. Fusible link on this machine?
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post #8 of 16 (permalink) Old 09-16-2019, 12:24 AM
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Easiest thing to do is a put a voltmeter on the battery while the engine is running and see what the voltage is. If it's 12 volts or so, the battery is not receiving a charge. It should be 13.6 or even higher
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post #9 of 16 (permalink) Old 09-16-2019, 08:50 AM
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Garage
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My battery is good and so is my alternator
Mine too!

2011 GMC Terrain 3.0L AWD
2008 Chevy Impala SS
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post #10 of 16 (permalink) Old 09-16-2019, 01:40 PM
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I agree with checking the charging voltage at the battery terminals, first prior to starting and then after it is running. There should be at least 12 volts at rest and can vary from around 13.2 - 15 volts when running.

Has the battery been load tested to verify condition? A simple volt meter reading is insufficient to determine battery capacity and condition.

If the alternator and battery are indeed good; then there is a charging circuit issue, if the charging voltage is the same as the static voltage of the battery.

2019 Chevy Equinox; 2.0 - LT - FWD - Silver Ice/Redline - Purchased 10/20/2018; Mills Chevrolet, Davenport IA
2016 Chevy Equinox; 3.6 - LTZ-AWD - Black/Black - Purchased 7/7/2016; Mills Chevrolet, Davenport IA
2017 Chevy Malibu; 1.5 - LT - Pepperdust - Purchased 8/2017; Green Chevrolet, East Moline, IL
2009 Chevy Silverado; 5.3 -LT - 4WD - Ext. Cab - Granite Met. - Purchased 02/2009; Green Chevrolet, East Moline IL
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