How accurate is the battery gauge?

TerribleONE · 12-22-2015, 10:58 AM

Battery gauge??

Assuming you are talking about the volt meter, which I would assume is pretty accurate.

Also, when the car is running it will show around 14 volts if the alternator is doing its job.

barncobob · 12-22-2015, 11:04 AM

how old is battery? anything over 3 years is a candidate for replacement

Ghostvette · 12-22-2015, 04:29 PM

Quote:

Originally Posted by kennyz

So long story short, woke up this morning tried starting my car , it wont turn on , nothing work , car won't unlock or lock. At first I thought it was steering lock failure since I haven't had a chance to pull my fuse BT from reading on the forum , it says it should still unlock and lock , lights should work still if is steering lock failure. Fortunately j was able to jumpstart the car so it definitely wasn't steering lock. I was driving my car perfectly fine yesterday and I always see my battery gauge above 12 and close to 14 if I remember correctly. So my question is how accurate is the guage? If my gauge is reading at like 14 .. My battery shouldn't have died so easily?

Quote:

Originally Posted by barncobob

how old is battery? anything over 3 years is a candidate for replacement

Voltmeter in car shows alternator output only.

What barncobob says is mostly correct. I replace wet cell batteries every two years regardless of warranty. I've never had a 'failure to start' due to battery since I started this practice.

Now for the inevitable question: "What battery do I get?"

AGM... whether it is an Optima or any other AGM, it doesn't really matter. An AGM battery will likely be the last one you put in your car. Just my

Chan Chee Hoe · 12-22-2015, 05:23 PM

Cold start in the mornung,it will show 14.3v,after warming up,it will dropped to 12.7v..

Spooler · 12-22-2015, 05:29 PM

Quote:

Originally Posted by Chan Chee Hoe

Cold start in the mornung,it will show 14.3v,after warming up,it will dropped to 12.7v..

Ugg, you have a problem. The minimum voltage should be 13.8 volts. If you don't see that you have a problem.

12-22-2015, 10:58 AM	#1 (permalink)
TerribleONE A True Z Fanatic Join Date: Jan 2009 Location: Socal Posts: 10,203 Drives: WOT Rep Power: 5851	Battery gauge?? Assuming you are talking about the volt meter, which I would assume is pretty accurate. Also, when the car is running it will show around 14 volts if the alternator is doing its job. kenchan, FPenvy, Ghostvette and 1 others like this. __________________ 638WHP 541WTQ @ 13.5PSI Build thread

12-22-2015, 11:04 AM	#2 (permalink)
barncobob A True Z Fanatic Join Date: Sep 2015 Location: hangtown, CA Posts: 1,164 Drives: 16 370Z auto Rep Power: 590	how old is battery? anything over 3 years is a candidate for replacement Ghostvette and wanker like this.

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12-22-2015, 05:23 PM	#4 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 18	Cold start in the mornung,it will show 14.3v,after warming up,it will dropped to 12.7v..