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Old 09-22-2021, 08:42 PM #1
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2020+ Voltage Booster
The fuse box layout changed for the 2020+ 4Runner.
Does Anybody know of a solution for a voltage booster for the 2020+ 4Runner to charge an AGM battery?

Arclight does not work
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Old 09-26-2021, 08:46 AM #2
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Bump, anybody?
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Old 09-27-2021, 10:20 AM #3
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GM fuse won't fit either?
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Old 09-27-2021, 04:40 PM #4
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I haven’t tried that.
I don’t want to assume that the fuse is called the same (Alt-S) but on another spot.
Was wondering if anybody else has tried it.
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Old 09-27-2021, 05:01 PM #5
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Here is my post about this:

https://www.toyota-4runner.org/5th-gen-t4rs/298637-[69][4k]-odyssey-agm-battery-gm-diode-mod-higher-voltage-proper-charge-2.html

I used the same diode as with the old layout but location and orientation is different. There is a link to photos there. I have been running an Odyssey battery with this setup for some months now with no issues. Charging voltage with the diode is the same as with the old AGM/diode setup.

You still have to file the diode to get it to fit.

Edit: well the link isn't working like I want. Maybe this link to the photos will work:

Toyota fuses - Google Photos
Last edited by dflowerz; 09-27-2021 at 05:05 PM.
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Old 10-01-2021, 01:54 PM #6
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Quote:
Originally Posted by dflowerz View Post
Here is my post about this:

https://www.toyota-4runner.org/5th-gen-t4rs/298637-[69][4k]-odyssey-agm-battery-gm-diode-mod-higher-voltage-proper-charge-2.html

I used the same diode as with the old layout but location and orientation is different. There is a link to photos there. I have been running an Odyssey battery with this setup for some months now with no issues. Charging voltage with the diode is the same as with the old AGM/diode setup.

You still have to file the diode to get it to fit.

Edit: well the link isn't working like I want. Maybe this link to the photos will work:

Toyota fuses - Google Photos

Thanks for the link

I assume your 4runner has not yet exploded from doing this correct?
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Old 01-28-2022, 09:57 PM #7
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Quote:
Originally Posted by dflowerz View Post
Here is my post about this:

https://www.toyota-4runner.org/5th-gen-t4rs/298637-[69][4k]-odyssey-agm-battery-gm-diode-mod-higher-voltage-proper-charge-2.html

I used the same diode as with the old layout but location and orientation is different. There is a link to photos there. I have been running an Odyssey battery with this setup for some months now with no issues. Charging voltage with the diode is the same as with the old AGM/diode setup.

You still have to file the diode to get it to fit.

Edit: well the link isn't working like I want. Maybe this link to the photos will work:

Toyota fuses - Google Photos
Tried doing the same to my buddies 2020 4runner but there's a battery check light that comes on
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Old 01-29-2022, 01:42 PM #8
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I'm confused...I had AGM's in my 2010( dual agm's, a 31 and 27) and 2016 (grp 31, now 6 yrs old) and never had an issue...what am I missing?
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Old 01-29-2022, 02:00 PM #9
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Correct me if I’m off here but it’s my understanding that optimal charge voltage for agm battery is 14.2+ volts (brand dependent), my alternator never got higher than 13.6v. With voltage booster i see around 14-14.2 so my battery should be charging at full capacity.


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Old 01-29-2022, 03:05 PM #10
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Quote:
Originally Posted by Titanpat57 View Post
I'm confused...I had AGM's in my 2010( dual agm's, a 31 and 27) and 2016 (grp 31, now 6 yrs old) and never had an issue...what am I missing?
2020+ the fuse box lay out changed. And the battery check light comes on with this mod

I have the same agm gm fuse mod on my 2014 no issues either
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Old 01-29-2022, 03:06 PM #11
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Quote:
Originally Posted by Ascole View Post
Correct me if I’m off here but it’s my understanding that optimal charge voltage for agm battery is 14.2+ volts (brand dependent), my alternator never got higher than 13.6v. With voltage booster i see around 14-14.2 so my battery should be charging at full capacity.


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Yes it should be charging at 14.2volts
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Old 02-22-2022, 03:37 PM #12
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Bumping this up.

Any updates from any other 2020+ owners doing the GM Diode mode? Interested in how many people are experiencing the check battery light.

Thanks!
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Old 02-24-2022, 03:13 AM #13
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Quote:
Originally Posted by TheWraith View Post
Tried doing the same to my buddies 2020 4runner but there's a battery check light that comes on
Flip the diode around the other way, 180 degrees.
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