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Old 01-13-2019, 09:32 PM   #15
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Yeah that's overcharge.
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Old 01-14-2019, 05:07 AM   #16
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What is a "full charging system check"?
A voltmeter will show voltage, but you need to see ripple, loaded voltage and amperage too. He needs a real tester, not a voltmeter.
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Old 01-14-2019, 07:22 AM   #17
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A voltmeter will show voltage, but you need to see ripple, loaded voltage and amperage too. He needs a real tester, not a voltmeter.

I was asking because voltage and amperage are the only metric to test an alternator by.

"Loaded" is the only way to test an alternator, as sticking multimeter probes on the battery terminals at idle with all accessories off isn't an alternator test. He can easily do it all with a cheap meter. VAC on the alt case and B+ terminal will show ripple better than the usual "charging system tester" with a ripple/diode indicator. But a leaking battery isn't likely to be a ripple issue. You don't need an amp clam, all accessories and lights on and a 1500 RPM idle is all the load you need, observing an output voltage that remains comfortably around 14V is all you need to know to confirm amperage output.

What we want to know here however is if the system is over charging, and we'll find that out by turning all the accessories off and having the engine turning at usual driving speed. It's OK to do this parked, and an overcharging alternator will simply show up as gradually increasing voltage following engine RPM, steadily increasing over 15 and possibly over 16V.
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Old 01-14-2019, 11:53 AM   #18
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Is your car tracked or auto-crossed?


Mine was always fine durint street use, but would notice it to be a tish wet after tracking/autox events.
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Old 01-14-2019, 01:12 PM   #19
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Possibly (likely) culprit is a faulty voltage regulator. A fellow racer had his battery spew it's guts all over his engine bay twice until we finally put a volt meter on the terminals and revved the engine a bit. The Voltage regulator should keep the voltage at a constant despite RPM like RZNT4R mentioned. However his would climb with RPM - 12v @ idle and I believe it jumped to 40v or more over 3000rpm.



On his car the voltage regulator is inside the Alternator (not sure on our cars) so swapping the alternator, along with cleaning the engine bay with baking soda, and we were back on track.
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Old 01-14-2019, 01:59 PM   #20
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I installed a Shorai battery in September of 2014 and I've had no major issues. I have noticed the battery doesn't like cold (sub 40s F.) but it still starts first try.

There was an old thread (locked now) where a forum member was selling custom battery trays to accommodate it and I picked one up. Definitely recommend running Shorai, I've been very happy with their products.
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Old 01-14-2019, 03:00 PM   #21
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I installed a Shorai battery in September of 2014 and I've had no major issues. I have noticed the battery doesn't like cold (sub 40s F.) but it still starts first try.

There was an old thread (locked now) where a forum member was selling custom battery trays to accommodate it and I picked one up. Definitely recommend running Shorai, I've been very happy with their products.
I removed the factory style and went to a 11lb Braille unit. Made my own install kit as I wasn't going to pay 100ish for the FT86SF unit.
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Old 01-14-2019, 04:09 PM   #22
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I removed the factory style and went to a 11lb Braille unit. Made my own install kit as I wasn't going to pay 100ish for the FT86SF unit.
Nice, any issues? When it gets cold I think the longest I can go without driving my car is about 8 days. However I picked up the Shorai charging unit so if it goes longer I just hook that up.
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Old 01-14-2019, 04:16 PM   #23
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Nice, any issues? When it gets cold I think the longest I can go without driving my car is about 8 days. However I picked up the Shorai charging unit so if it goes longer I just hook that up.

I have a CTEK charger wired into the car, its not a daily and is stored in winter.

I had a little trouble starting the last autocross I was at when I took it off the trailer and in the morning for the 2nd day. It was 34 degrees and I am on a E85 OFT map with no adjustments to cold start tables. I did have some cold start issues on really cold mornings with previous battery as well.
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