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Join Date: Jul 2005
Location: Reno, NV
Posts: 5,941
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modern battery charging voltage??
My 2007 Saturn Vue has a battery charging fault light that comes on when I start it. So I was thinking I have an alternator going .. So I bought a new alternator ( haven't installed it yet) but to double check I put in a voltage gauge/ usb charger in the cig lighter and have been monitoring it.. Seems to like 13.8-14.1 volts .. Ok so I'm thinking that correct ,, might be a spike once in a while that I don't catch ( diode in the alternator going bad?).
Now Im on a road trip so used another usb charger/ volt meter set up for a spare charger in my 2014 buick.. I"m noticing that the voltage goes up as high as 15.1 V once in a while and down as low as 12.6 Volts.. So my question is.. what do modern cars charge at ? With my buick it seems that they are all digitally controlled as the voltage does seem to fall as the battery gets topped off, but the initial charge still seems high..
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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12-24-2019, 10:58 AM
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Join Date: Jul 2005
Location: Reno, NV
Posts: 5,941
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Ok meant to post this in off topic but what the hell. We all know turbo guys are the smartest ones on the forums anyway!!!
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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12-24-2019, 10:59 AM
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Join Date: Dec 2005
Location: Allentown, PA
Posts: 1,233
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Don't know what modern cars charge to. I would think around 13.5-14V would be safe. Maybe check online for info on the Vue.
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Find Spoke's LED Products: www.spokeworksled.com |
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12-24-2019, 02:45 PM
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Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
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Quote:
The Bosch reman I took out was logging 14.1V. I do notice that gauge readings like oil pressure don't tick down anymore when I switch the lights on... And the lights are a lot brighter too - with relays/fuse panel, 10 year old stock 55/60w bulbs were already white, now they're brighter still... To the point where I've had a pair of Philips ExtremeVision +130 bulbs waiting to go into the 911 for a couple of years (ever since I fitted one to the Ducati and was impressed by the improvement), but has never seemed urgent enough to get around to fitting them.
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'77 S with '78 930 power and a few other things. |
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12-31-2019, 07:53 AM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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Saturn,
chances are the battery is going bad. could be that the battery voltage is dropping too low when cranking. buick looks like a alternator. take then both to some place like advance and let them test everything for freeeeeeeeeee! much better than guessing
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-31-2019, 09:04 AM
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Join Date: Jul 2008
Location: Central Washington State
Posts: 4,376
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Go here to learn all about batteries, all kinds. More than you'll ever want to know.
https://batteryuniversity.com/learn/
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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01-01-2020, 04:26 AM
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