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09-25-2022, 04:41 PM | #1 |
Scooby Newbie
Member#: 493310
Join Date: Oct 2018
Vehicle:2010 Sti |
Can the charging voltage be turned down? 2010 STI
My car charges at 14.1 to 14.7vdc. Our forester did the same. This happens whether the car has just been started or driven for several hours. It doesn't drop below 14 no matter what I do.
The battery has evidence of acid leaking out from under the battery caps. If I do not wash the top of the battery every so often the battery hold down clamp shows a little rust. Every other vehicle I have (from the 67 Toyota to the 2015 Honda) charges at 13.something vdc. No other vehicle shows evidence of overcharging. I had this battery in a different vehicle for a while and it showed no evidence of leaking or overcharging. Can this voltage be turned down somehow? Does the car need to run at such a high voltage? Is this just another Subaru thing that we all just deal with? The battery is an AC Delco flooded battery. It is at least 4 years old and works fine. Thanks for any thoughts.
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09-25-2022, 06:12 PM | #2 |
Scooby Specialist
Member#: 458809
Join Date: Nov 2016
Chapter/Region:
NESIC
Location: Boston
Vehicle:05 blob, 02 bug |
People use rectifier diodes such as a 1n4007 on the battery sensing wire to increase battery charging voltage. I did this myself to my own car because it would typically charge at only around 13.0-13.5V. You could do the same but to the return wire to decrease charging voltage.
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09-26-2022, 12:29 PM | #3 | |
Scooby Newbie
Member#: 507317
Join Date: Oct 2019
Chapter/Region:
MAIC
Location: SW Ohio
Vehicle:2019 WRX Pure Red |
Quote:
What was the amp rating on the other cars you mentioned above? Other research: - 2015 Accord 2.4L 4-cyl: 110A - 125A; V6: 130A - 135A - 2015 Civic 1.8L 4-cyl: 95A I know ppl who would seek out higher amp output alternators to keep up w/electrical demand such as high-watt stereos, aux-lights, air compressors, or any other device with high current demands. Is the battery vent tube clogged or blocked causing acid to vent out of the fill holes? Good luck in your quest. |
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09-30-2022, 05:47 PM | #4 | |
Scooby Newbie
Member#: 493310
Join Date: Oct 2018
Vehicle:2010 Sti |
Quote:
There's no vent tube. This isn't an old motorcycle battery. I do know the difference between volts and amps. Amp ratings have no relevance here. Thanks for bringing attention to the thread. |
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