what should my voltmeter read?

[Yorkie3621]

It used to read 14.4v all the time, then my main battery went bad and blew a 150amp fuse block. Dealer replaced the fuse block and the battery, since then it's been reading 12.6 to 13.9 randomly. I put it on charge yesterday with a Genus charger and conditioner and it now reads 12.7v constantly. Am i overthinking it?

Thanks.

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[WranglerMan]

What you are seeing is normal, the JL utilizes a smart alternator so the days of seeing 14+ all the time are gone unless it’s parked a lot but even then after a long drive the voltage should float like what you are seeing.

The IBS monitors the voltage then it works in conjunction with the alternator to send out the needed charge to bring the battery up to fully charged so if it’s parked say several days upon startup the EVIC display will more than likely be over 14 volts but after driving for a bit the voltage should slowly display a lower voltage as the batteries are getting closer to being charged and as you slow down and start breaking you will see the voltage ramp up and once stopped will drop back down.

The process above keeps the batteries at peak charge and reduces the drag induced on the system by not throwing a constant 14+ volts all the time to the batteries and this is supposed to give you increased fuel economy and also not keep charging and charging your batteries shortening their life.

Here is some info on how the system is supposed to work in regard to the alternator

https://www.redarc.com.au/alternator-vs-fixed-alternator

Also the reason you are seeing the 12.7 after being charged is the IBS has figured out the battery is fully charged so the alternator is not throwing any charge to the battery, after it’s parked a day or two you will see it slowly creep up but again if you take it for a long drive it will slowly drop down to the 12.8-13.0 range and ramp up and down.

Here is a short vid I did quite awhile back and this is normal

 

[Yorkie3621]

This

What you are seeing is normal, the JL utilizes a smart alternator so the days of seeing 14+ all the time are unless it’s parked a lot but even then after a long drive the voltage should float like what you are seeing.

The IBS monitors the voltage then it works in conjunction with the alternator to send out the needed charge to bring the battery up to fully charged so if it’s parked say several days upon startup the EVIC display will more than likely be over 14 volts but after driving for a bit the voltage should slowly display a lower voltage as the batteries are getting closer to being charged and as you slow down and start breaking you will see the voltage ramp up and once stopped will drop back down.

The process above keeps the batteries at peak charge and reduces the drag induced on the system by not throwing a constant 14+ volts all the time to the batteries and this is supposed to give you increased fuel economy and also not keep charging and charging your batteries shortening their life.

Here is some info on how the system is supposed to work in regard to the alternator

https://www.redarc.com.au/alternator-vs-fixed-alternator

Also the reason you are seeing the 12.7 after being charged is the IBS has figured out the battery is fully charged so the alternator is not throwing any charge to the battery, after it’s parked a day or two you will see it slowly creep up but again if you take it for a long drive it will slowly drop down to the 12.8-13.0 range and ramp up and down.

Here is a short vid I did quite awhile back and this is normal

answers all my questions. Thank you so much.

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