# Honda Civic 2010 Alternator Voltage Regulator **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** civic, honda\ **Created:** [June 22, 2018, 2:28am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602 "2018-06-22T02:28:49Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 22, 2018, 2:28am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/1 "2018-06-22T02:28:49Z")
issue: car needed a jump start after work, the battery was not completely dead but not charged enough to get the motor running I had a diagnostic test done at Autozone, test reading: battery good, alternator regulator faulty Since then I have driven the car several times to run errands and get to work, so far no issues car has 70K miles can I trust the Autozone reading? if repair is needed, are aftermarket parts ok? Is it a repair I could try to do myself? Looking forward to your answers. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [June 22, 2018, 2:31am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/2 "2018-06-22T02:31:23Z")
A diy’er can do a basic voltage check with a volt meter probing the battery terminals. When the car hasn’t been used overnight, and before starting the engine the next morning, the battery should measure about 12.6 volts. After starting the engine , should measure in the 13.5- 15.5 volt range. What does yours measure? Do you know what caused the battery to go dead the time after work? ---
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 22, 2018, 2:54am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/3 "2018-06-22T02:54:43Z")
I have no explanation why battery was dead. I have not checked the volt range. ---
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 22, 2018, 2:56am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/4 "2018-06-22T02:56:11Z")
I found this in an older post: \_Honda alternator is controlled by the engine computer so it cannot be diagnosed by any one that does not have a computer link to the manufacturer - Is this a correct statement? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 22, 2018, 2:57am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/5 "2018-06-22T02:57:13Z")
Yes. It requires a scanner with the correct program. Tester ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [June 22, 2018, 3:00am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/6 "2018-06-22T03:00:43Z")
It’s correct, but a diy’er can still do some basic diagnosis, as mentioned above. If it fails that test, most likely there is a alternator or battery problem. If it passes the test, good chance the alternator at least is ok. ---
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 22, 2018, 3:02am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/7 "2018-06-22T03:02:12Z")
how about the Autozone test result? Is it just a guess? ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [June 22, 2018, 6:21am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/8 "2018-06-22T06:21:42Z")
> [@mercury07](#): > > I had a diagnostic test done at Autozone, test reading: battery good, alternator regulator faulty The conductance battery test is not without fault, you can get different results from a battery after sitting over night. It is unlikely that you are driving around with a failing alternator, your weak battery would allow the vehicle to operate for just a few minutes without an alternator. How old is this battery? Is there a warranty? ---
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 23, 2018, 11:17am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/9 "2018-06-23T11:17:56Z")
checked battery again with volt meter, bad battery-thanks ---
**Author:** ![mercury07](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@mercury07](https://community.cartalk.com/u/mercury07)\ **Post date:** [June 23, 2018, 11:20am UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/10 "2018-06-23T11:20:22Z")
battery was at least 7 years old, Autozone diagnosis proved to be wrong-thanks ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [June 23, 2018, 10:47pm UTC](https://community.cartalk.com/t/honda-civic-2010-alternator-voltage-regulator/119602/11 "2018-06-23T22:47:29Z")
Good for you for getting the problem correctly diagnosed and repaired. Best of luck. Auto batteries as reported here rarely last more than 5-6 years, so you got your money’s worth out of that one.