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Old 01-18-2022, 03:47 PM #16
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Toyota09 -before I threw almost $500 at this problem, I'd want to know for sure what is bad. Charging system components, when they go bad, can take each other out in some cases.

The negative battery cable should go directly to a hard ground. It should be tight and corrosion free at both ends. It should be easy to follow. Same with the positive cable - it should go to the starter. It may go to a starter solenoid first - or that may be at the starter. It should be easy to follow too. It should also be tight and corrosion free. Inspect all wiring to make sure there is no damaged insulation. Also, check all connections to the alternator. Looking up the starting / charging system diagram for your make, model and year of 4Runner would give you the specifics. Might as well look for rodent damage as well.

Most repair shops have a tester that will diagnose charging system problems with the vehicle running and can tell you what is wrong. Part of this testing is to apply a load to the system to check the alternators ability to supply power (part of the alternator's job is to charge the battery via the voltage regulator). Most auto parts stores don't have this equipment. Most can test an alternator or battery if you remove it and take it in; but those tests are limited and leave out the rest of the system.

Since your battery is almost 4 years old - it would be suspect. However, I'd what to know if there are any other issues here. After re-reading your initial post, I'd also check to make sure everything is off when you turn the vehicle off. There is a certain amount of parasitic draw in most vehicle electrical systems. Keeping the radio presets and clock correct are two examples. With several computers in each vehicle - there are more. Most vehicles are designed to handle this for a certain amount of time. However, there could be a problem (such as a door ajar or light left on or ?) that could be a cause as well. Anyway, I'd start with an inspection; followed by good diagnostic testing. Good luck.
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Old 01-18-2022, 06:48 PM #17
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There is a diode you can install, piggyback, into fuse panel that'll bump the voltage to properly charge an AGM.

I will find a link, but I installed one in my FJ when I installed the Odyssey battery. Bumped the voltage quite a bit.
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