2013 Honda Accord - Battery Voltage Fluctuates - Drive Accord Honda Forums | radio-pro.ru
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post #1 of 12 Old 02-23-2017, 05:25 AM Thread Starter
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2013 Honda Accord - Battery Voltage Fluctuates

I've been monitoring the battery voltage through my OBD2 sensor. While I'm driving, the battery voltage moves from 14.1 V to 12.5 V. It's not constant or follows a pattern. Sometimes it'll stay at 14.1 V. Other times it'll bounce between these voltages or stay at 12.5 V. Is this normal or is there something wrong with the alternator?

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post #2 of 12 Old 02-23-2017, 06:01 AM
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Normal. A perfect case of "Too Much Information" This how the newer alternators are designed to work. They are designed for maximum fuel economy, and only charge as needed.

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post #3 of 12 Old 02-23-2017, 07:45 AM
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The ELD (Electrical Load Detector) has been around since the early 90's. Basically if there is low current draw from the electrical system, the alternator is commanded to charge in low mode. If the current draw from the Electrical system is higher (AC on, headlights on, defroster on...Etc) the alternator is charging in high mode.

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post #4 of 12 Old 02-23-2017, 11:20 AM
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Quote:
Originally Posted by justgotya View Post
I've been monitoring the battery voltage through my OBD2 sensor. While I'm driving, the battery voltage moves from 14.1 V to 12.5 V. It's not constant or follows a pattern. Sometimes it'll stay at 14.1 V. Other times it'll bounce between these voltages or stay at 12.5 V. Is this normal or is there something wrong with the alternator?
{bolded}
IMO this ELD is exactly why these batteries die so soon, especially the 51's. Low capacity and the one step forward, two back way of charging the battery. I NEED to drive my daily route with the headlights on always since my 15 mile trip would NEVER go to 14.4 Volts, during the trip if I didn't.

Idle in Park, No lights, 14.4 volts. Drive with no lights 12.6 V. Drive and Turn lights on, 14.4 V. Route is 5 miles stop/go (suburban) 10 miles 65 MPH expressway, no traffic slow downs ever.

It (ELD) saves on gas and HP, but blows it in extra charging, new batteries every few years (earlier than necessary), aggravation.

That's the way it is though.

My suggestion to you is to run with the lights on at all times especially if there is not enough miles in your trips to charge the battery properly at 12.6 V.
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post #5 of 12 Old 02-23-2017, 07:14 PM Thread Starter
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Thanks for the help.
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post #6 of 12 Old 02-25-2017, 12:38 PM
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What's funny to me is, I just bought one of those little battery voltage indicators that just plugs into the charging port. Just as OP described, I've noticed that it fluctuates between 12.5v and 14.5v randomly, with no rhyme or reason.

Reading this thread explained why, so thanks peepz!
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post #7 of 12 Old 03-01-2017, 11:18 AM
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This thread caught my eye several days ago and I finally found my Elmscan OBD-II device. I made a 10 mile round trip today and monitored the control module voltage as well as the adapter voltage. The voltage at the adapter (and would imagine this is the same as you'd see at the 12V accessory outlet / cigarette lighter) was a constant 14.3V. The control module adapter bounced around a little between 13.8 and 14.3V. I checked with different current draws - headlights, A/C fan, audio system all in different variations of on and off from all off to all on at once and while driving as well as idle.

Never dropped below 13.8V. I understand that voltage and current output are regulated intelligently by a control module but if charge voltage drops to 12.5V, then that is essentially no charging at all. That wouldn't be enough to overcome the electromotive force needed to push electrons into the battery.

I'll continue watching mine for a few days to see what it does and post back. It's kind of wild that Honda would allow the battery to ever be in a discharging state for any length of time.

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post #8 of 12 Old 03-02-2017, 05:54 AM
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Quote:
Originally Posted by AccordULEV View Post

I'll continue watching mine for a few days to see what it does and post back. It's kind of wild that Honda would allow the battery to ever be in a discharging state for any length of time.
Why? We know that the battery is not being charged at a constant, steady rate.

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post #9 of 12 Old 03-02-2017, 06:23 AM
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Originally Posted by cookieman214 View Post
Why? We know that the battery is not being charged at a constant, steady rate.
Charge rate is variable, sure. But dropping to 12.5V is abnormal. There is no charging at all happening at that voltage.

Checked again last night. Mine never drops below 13.7V. There is fluctuation, yes but the alternator never just stops charging the battery altogether.

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post #10 of 12 Old 03-02-2017, 09:59 AM
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Originally Posted by AccordULEV View Post
Charge rate is variable, sure. But dropping to 12.5V is abnormal. There is no charging at all happening at that voltage.

Checked again last night. Mine never drops below 13.7V. There is fluctuation, yes but the alternator never just stops charging the battery altogether.
I also have one of those power port meters and it is reading .3-.4 volts LOWER than at the battery posts. I measure 12.3VDC power port, 12.65 VDC at posts (engine not running). There must be a huge voltage drop at the power port OR the power port is regulated differently to avoid frying electronics. So I don't rely on the voltage reading taken there as gospel.

The meter itself is accurate. I verified it to a calibrated voltmeter and it is accurate. Go figure a 15.00 meter that accurate !

I'll need to do a live data dump as you did on my daily drive.


AccordULEV was your trip including stop/go and highway speeds? I've read that the ELD will not charge anything below a steady 3K (70 mph = about 2k rpm "V6") but will at 10-45 mph and at idle. TIA

keep_hope_alive had a great thread regarding his workaround and IIRC he stated that earlier models(2013? included) drops unless AC or headlights are on. Maybe your 2015 has fixed that with a software update.

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post #11 of 12 Old 03-06-2017, 05:32 AM
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Originally Posted by Miker View Post
I also have one of those power port meters and it is reading .3-.4 volts LOWER than at the battery posts. I measure 12.3VDC power port, 12.65 VDC at posts (engine not running). There must be a huge voltage drop at the power port OR the power port is regulated differently to avoid frying electronics. So I don't rely on the voltage reading taken there as gospel.

The meter itself is accurate. I verified it to a calibrated voltmeter and it is accurate. Go figure a 15.00 meter that accurate !

I'll need to do a live data dump as you did on my daily drive.


AccordULEV was your trip including stop/go and highway speeds? I've read that the ELD will not charge anything below a steady 3K (70 mph = about 2k rpm "V6") but will at 10-45 mph and at idle. TIA

keep_hope_alive had a great thread regarding his workaround and IIRC he stated that earlier models(2013? included) drops unless AC or headlights are on. Maybe your 2015 has fixed that with a software update.

I've been monitoring mine. The ELD is perhaps programmed differently on mine (?). I have monitored at highway speed (70-80mph), around town (25-40mph) and at idle. All situations with headlights on/off, radio on/off, A/C fan on/off - ALL accessories OFF at idle. It makes no difference. I see 13.7V minimum, normally 14.0V and as high as 14.3 V at the control module (I assume this is a direct voltage from the alternator) and a consistent/steady 14.3 volts at the OBDII adapter, which I assume is after the voltage has been passed through the voltage regulator so that the signal has been cleaned up. Voltage at the adapter does not fluctuate at all ever.

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post #12 of 12 Old 03-09-2017, 06:05 AM
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it is not uncommon to measure a voltage drop at the power port in the dash relative to the battery. the factory wiring is small and will have measurable voltage drop.

yes, our alt is controlled by the ECM and regulates output at 12.5VDC to match the battery float voltage and reduce the load on the engine by the alternator.

with headlights on it jumps to 14.4VDC to resolve the dimming issues people use to report on older generations.

when braking or coasting, it jumps to 14.4VDC for "regenerative" effects.

i have a few youtube videos demonstrating this.

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