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Old 10-12-2019, 11:04 PM #16
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Originally Posted by KP Texan View Post
Just replaced the 4 year old battery in my 2012 since it wouldn't hold a charge, and I've been watching the voltmeter much more closely over the past few days. Voltage seems to be normal and stays fairly steady (14.0 volts or so after I start driving, and then settling to around 13.9 volts).
Hi KP Texan,

All Alternator voltages fluctuate some, due to what the voltage Regulator's job is. It's there to maintain a safe voltage charge flowing to the battery, ...and... the vehicle's electrical system operation! Voltage flux is affected by, ambient Temperature, load demand fluctuation, wire length/diameter, and distance!

You don't (judging by your statement), have anything 'Abnormal' about your alternator's behavior, so you can just Relax and enjoy the security of the new battery, Okay(?)!

rig, cheers! Lol!
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Last edited by rigtec; 10-12-2019 at 11:06 PM.
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Old 10-12-2019, 11:15 PM #17
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Pull the ground straps on the chassis, frame, and engine and shine them up. Better yet run copper grounds to the body ground locations from the battery. I did this to a celica and the power windows sped up significantly.
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Old 10-14-2019, 08:43 AM #18
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Originally Posted by KP Texan View Post
Well, that's a bit unnerving to hear (just remember it's a gif so its playing over and over - the dip only happens once while braking). I'll check out the bulbs and any grounds also just to make sure those are good to go. I hate things like this that may or may not be a problem - I'd almost rather deal with something going out completely than wondering!

@rigtec mentioned "voltage droop" in one of his posts comparing his new high current alternator compared to the stock one. Maybe this is one of the symptoms he's referring to?
I checked my voltage meter over the weekend and it actually does exactly the same dip as yours, I just never really noticed it! So, no worries, all is normal!!!
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Old 10-14-2019, 10:07 PM #19
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Thanks guys! I feel much better about it now.
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Old 01-12-2022, 10:15 AM #20
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I replaced my dead battery yesterday and I too was paying some closer attention to the voltage meter in the dash. sits just left of 14v when vehicle is running. sometimes when I press the brakes, same thing happens, slight dip then comes back up. seems to be when I'm stopped in park it's most noticeable, doesn't happen too much when I'm driving. no headlight dimming or interior dimming. all lighting is OEM. edit: I first noticed this when it was cold out and blower fan on full, defrosting windows and high heat setting

I also noticed this happens when I put the truck in reverse from park but don't let foot off the brake. It seems to stay a bit lower until I go back to park/drive/neutral. perhaps rearview camera/reverse lights drawing power or how they are wired. I've seen some posts on other forums with 80 series LC doing the same thing but haven't heard about a 4runner doing it

I assume this is also normal, battery terminals/connections are clean and tight. as rigtec mentioned, the alternator seems to be doing it's job by regulating the charge. you don't know what you don't know, I'm surprised I hadn't noticed this earlier
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Old 01-12-2022, 02:51 PM #21
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**** the volts.. measure your CCA to find battery life.

I run a tender on mine, battery is over 6 years old now. Without the tender I think the battery would get maybe 3-4 years max.

Keep the terminals clean, use a terminal cleaner and then use the red magic spray to minimize corrosion.

Our stock batteries are 550CCA panasonics on the old ones. I like to aim to keep it above 500ish. I check it only when parked and sat overnight.
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