Fluctuating Voltage Display - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Newbie BRZ · 11-09-2021, 10:34 PM

Hello, I have had my car for about 8 months and just the past couple of days I noticed my voltage display going from 12.5 - 14.2 volts. It only happens when the car is warm and mildly accelerating. Nothing else is unusual and it seems to stay around the 14v mark with the lights on.
Any help appreciated.

tomm.brz · 11-10-2021, 02:47 AM

normal

humfrz · 11-10-2021, 02:51 AM

Hey ya, Newbie BRZ - welcome to ye ol forum -

So, what is your concern?

I reckon that fluctuating is normal and nothing to worry about.

However, I'm going to send in a specialist @soundman98 and ask him to give his opinion.

Newbie BRZ · 11-10-2021, 03:52 AM

Ok thanks guys. Funny it only just started but it did 3-4hrs cruise a week ago. I did a search on google and it sent me here with some answers but the forum search showed nothing?

ZDan · 11-10-2021, 09:07 AM

More optimal to charge while totally off the throttle, coasting or braking, and to eliminate the drag from the alternator when under cruise conditions as much as possible. There's a brain that keeps up with state of charge to ensure the battery stays topped-off.

Normal on '17+

Tokay444 · 11-10-2021, 10:35 AM

Quote:

Originally Posted by Newbie BRZ

Ok thanks guys. Funny it only just started but it did 3-4hrs cruise a week ago. I did a search on google and it sent me here with some answers but the forum search showed nothing?

So what's the problem?

Tcoat · 11-10-2021, 10:45 AM

Probably has always done it and just never noticed before.

Newbie BRZ · 11-10-2021, 05:42 PM

Great Thanks I can rest easy now. Yes probably didn`t notice it doing it before.

Tcoat · 11-12-2021, 10:29 AM

Quote:

Originally Posted by Newbie BRZ

Great Thanks I can rest easy now. Yes probably didn`t notice it doing it before.

Now you need to worry if you notice it STOPS doing it!

AlinaBetka · 11-15-2021, 05:08 PM

Thank you. That was very helpful.
najepsze darmowe filmy

Tcoat · 11-15-2021, 07:16 PM

Quote:

Originally Posted by AlinaBetka

Thank you. That was very helpful.

Anytime...
Bot

AlinaBetka · 11-17-2021, 07:47 PM

Quote:

Originally Posted by Tcoat

Anytime...
Bot

what ? Bot or both ?

11-09-2021, 10:34 PM	#1
Newbie BRZ Member Join Date: Sep 2021 Drives: brzts vwbeetle Location: 1/2 way Posts: 16 Thanks: 7 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Fluctuating Voltage Display Hello, I have had my car for about 8 months and just the past couple of days I noticed my voltage display going from 12.5 - 14.2 volts. It only happens when the car is warm and mildly accelerating. Nothing else is unusual and it seems to stay around the 14v mark with the lights on. Any help appreciated.

11-10-2021, 10:45 AM	#7
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Probably has always done it and just never noticed before. Attached Images __________________ Racecar spelled backwards is Racecar, because Racecar.

11-15-2021, 05:08 PM	#10
AlinaBetka Junior Member Join Date: Nov 2021 Drives: Fast Location: USA Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you. That was very helpful. najepsze darmowe filmy Last edited by AlinaBetka; 11-17-2021 at 07:55 PM.

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11-10-2021, 02:47 AM	#2
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,279 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	normal

11-10-2021, 02:51 AM	#3
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Hey ya, Newbie BRZ - welcome to ye ol forum - So, what is your concern? I reckon that fluctuating is normal and nothing to worry about. However, I'm going to send in a specialist @soundman98 and ask him to give his opinion.

11-10-2021, 03:52 AM	#4
Newbie BRZ Member Join Date: Sep 2021 Drives: brzts vwbeetle Location: 1/2 way Posts: 16 Thanks: 7 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Ok thanks guys. Funny it only just started but it did 3-4hrs cruise a week ago. I did a search on google and it sent me here with some answers but the forum search showed nothing?

11-10-2021, 09:07 AM	#5
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,672 Thanks: 1,439 Thanked 4,011 Times in 2,097 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	More optimal to charge while totally off the throttle, coasting or braking, and to eliminate the drag from the alternator when under cruise conditions as much as possible. There's a brain that keeps up with state of charge to ensure the battery stays topped-off. Normal on '17+

11-10-2021, 05:42 PM	#8
Newbie BRZ Member Join Date: Sep 2021 Drives: brzts vwbeetle Location: 1/2 way Posts: 16 Thanks: 7 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Great Thanks I can rest easy now. Yes probably didn`t notice it doing it before.

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