AGM Battery GM Voltage Booster

Token_Indian

Token_Indian

New member
Hello,

I am in the process of updating my main battery for the Runner and have read from multiple threads about the lack of voltage that comes from the stock alternator when upgrading to an AGM battery. Apart from getting an actual voltage booster it seems that the GM diode is a good substitute.

I am inquiring on those who have gone the GM route if they have encountered any issues with over charging the AGM battery or by increasing the voltage coming from the alternator if it lessens the life of the alternator?

I am not doing anything too crazy offroad, mostly 2-3 night camping, and I have been getting by just fine with the regular 24f battery, but I can get a decent priced 24f AGM for the same price. I dont have a fridge just yet and the only draws to the battery are mostly lights. Im just thinking in the future if I get an AGM battery that it would put extra stress on the alternator or does the voltage booster just boost the regular alternator capacity without overworking it?

Either way Ill be getting a quality battery. Thanks.
 
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Token_Indian said:
Hello,

I am in the process of updating my main battery for the Runner and have read from multiple threads about the lack of voltage that comes from the stock alternator when upgrading to an AGM battery. Apart from getting an actual voltage booster it seems that the GM diode is a good substitute.

I am inquiring on those who have gone the GM route if they have encountered any issues with over charging the AGM battery or by increasing the voltage coming from the alternator if it lessens the life of the alternator?

I am not doing anything too crazy offroad, mostly 2-3 night camping, and I have been getting by just fine with the regular 24f battery, but I can get a decent priced 24f AGM for the same price. I dont have a fridge just yet and the only draws to the battery are mostly lights. Im just thinking in the future if I get an AGM battery that it would put extra stress on the alternator or does the voltage booster just boost the regular alternator capacity without overworking it?

Either way Ill be getting a quality battery. Thanks.
Click to expand...

I got a 24F AGM recently and its been great on my 4-6 night camping trips even with my non modified alternator.
But I use a battery charger maintainer every now and then when not camping to fully charge and maintain.

I too would like to do some kind of more integrated charging. But I don't want to just go the GM rout ether.
 
I second the Arclight voltage booster. You can’t beat the couple of settings you have which can help in colder weather. Just throw it on there, set it, and forget it is what I did. And if you do go back to a regular battery you literally just flip it to off.
 
comtn4x4 said:
Have you looked at this thread?


https://www.toyota-4runner.org/5th-...oster-31m-agm-battery.html?highlight=GM+diode


I ran the GM diode for awhile and now have the Arclight version. I didn't get as much voltage from the GM diode as was needed to maintain my AGM battery especially when it's really cold
Click to expand...

4runnin4mylife said:
I second the Arclight voltage booster. You can’t beat the couple of settings you have which can help in colder weather. Just throw it on there, set it, and forget it is what I did. And if you do go back to a regular battery you literally just flip it to off.
Click to expand...
Which make and model AGM battery did you guys go with?
 
TRD PANTHER said:
Which make and model AGM battery did you guys go with?
Click to expand...


I ran an Odyssey 34 series for a while and now a Northstar 27F (Northstar no longer exists. They were purchased by Odyssey's parent company Enersys unfortunately) The Odyssey was fine although due to my lack of knowledge I shortened it's life by not maintaining it properly. The 27F size is a great size if you're not going to run dual batteries. Whatever you choose some sort of maintenance will be necessary. Either periodic use of a trickle charger or one of the fuse/diode setups.
 
I have a 34 and have been running the Arclight Booster for 2 years and no complaints. Keeps a steady 14.5 at idle and 14.2-3 under load
 
Thanks for the feed back and information. So its safe to say the Arclight voltage booster is the way to go to keep the AGM batteries topped off. Has anyone had any issues with the arclight booster, overcharging the battery or would the fuse pop protect it from damaging the battery?
 
Dumb question: Is this for rigs that aren’t daily drivers?

I need a new battery and was looking at AGM options from various sources to help survive the hot SE AZ desert to not need a new battery every couple of years.

Thanks!
 
Partywaggin said:
Dumb question: Is this for rigs that aren’t daily drivers?

I need a new battery and was looking at AGM options from various sources to help survive the hot SE AZ desert to not need a new battery every couple of years.

Thanks!
Click to expand...


My rig was a daily driver. I would drive it 70 miles round trip to work. It was a mild build for a little extra capability and capacity on my long weekend excursions. I think the daily driving along with the ArcLight booster was a great combo for the AGM battery. I set the booster and forgot about it. What I mean by that is I never put it on a charger to top it off or anything. Just drove. If it’s not a daily driver rig it’s not too difficult either, but you will have to put it on a charger periodically to help top it off to maintain the battery’s life.
 
comtn4x4 said:
Why yes it is
Click to expand...

Thanks!

Pretty basic website but I trust you guys.

I just don't want put it on a charger now and then to make sure its 100%. Plus when i am Overlanding i am not near a charger. So this device is a must.
 
Last edited:
Curious. Any reason to upgrade my alternator for the Arclight Booster for long term durability?

Should i leave it at the highest charge?
 
Ripper238 said:
Curious. Any reason to upgrade my alternator for the Arclight Booster for long term durability?

Should i leave it at the highest charge?
Click to expand...


I don’t see any reason to upgrade your alternator for long term durability. I haven’t heard anyone pointing to an alternator failure directly related to the ArcLight booster. I set mine to the boost setting (the low setting of the two) and drove it as I always do. 4 years later… all good!
 
4runnin4mylife said:
I don’t see any reason to upgrade your alternator for long term durability. I haven’t heard anyone pointing to an alternator failure directly related to the ArcLight booster. I set mine to the boost setting (the low setting of the two) and drove it as I always do. 4 years later… all good!
Click to expand...

Thank you.

Ill probably set it to the regular boost setting too and use the extra boost when I am overlanding where i may idol to get some extra juice for over night.

My ride to work is only about 15min each way, but I am sure that will be fine with my long rides on my day off. Been manually boosting it with a charger for a year now which was fine but this should be much better when I'm on the road. Almost seems getting an AGM and not adding a booster is a waist.
 
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