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Old 10-08-2020, 01:38 PM #1
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07 SR5 Dead battery after 1 day

Hey guys so I have a 2007 SR5 that is having a dead battery after one day of sitting. I have narrowed it down to this fuse in the engine bay (see pics)
Do you guys have any idea what this could be? Maybe an alternator? I never seem to get more than 13.5 volts charging even when driving.

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Old 10-08-2020, 07:03 PM #2
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Quote:
Originally Posted by evan1242 View Post
Hey guys so I have a 2007 SR5 that is having a dead battery after one day of sitting. I have narrowed it down to this fuse in the engine bay (see pics)
Do you guys have any idea what this could be? Maybe an alternator? I never seem to get more than 13.5 volts charging even when driving.

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I'm afraid you've got to dig a little deeper. That's a main fuse or what I've always referred to as a fusible link, even though technically it's not. It supplies power to multiple circuits. I found a fuse box diagram and it appears to be fuse #40. This is what it supplies power to: 40 AM1 50 All components in "ACC", "CIG", "IGl", "ECU-IG", "FR WIP-WSH", "RR WIP", "RR-WSH", "4WD", and "STA" fuses.
If you want to look at the diagram it's here: Fuse Box Diagram Toyota 4Runner (N210; 2003-2009)

Hope the link works, and I hope this helps a little. Good luck.
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Old 10-09-2020, 07:42 AM #3
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Originally Posted by importman View Post
I'm afraid you've got to dig a little deeper. That's a main fuse or what I've always referred to as a fusible link, even though technically it's not. It supplies power to multiple circuits. I found a fuse box diagram and it appears to be fuse #40. This is what it supplies power to: 40 AM1 50 All components in "ACC", "CIG", "IGl", "ECU-IG", "FR WIP-WSH", "RR WIP", "RR-WSH", "4WD", and "STA" fuses.
If you want to look at the diagram it's here: Fuse Box Diagram Toyota 4Runner (N210; 2003-2009)

Hope the link works, and I hope this helps a little. Good luck.
Awesome! Thank you for that link. That will definitely help me narrow it down some more.
Iíll report back with what I find next.
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Old 10-09-2020, 01:06 PM #4
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My scangauge II shows my voltage while driving as 13.8-14.0 volts. When I turn the truck off it rests at 12.8 volts.

If your battery is dying after one day then you have a power drain or your alternator is dead. What does your battery voltage show at idle with the truck on?

Have you done any electrical mods like adding a dual usb port in your center console?
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Old 10-12-2020, 12:35 AM #5
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It could be a bad battery. Check each cell with a hydrometer. If one cell is lower than the rest that cell is bad. Each cell is worth 2.1 volts. A battery with a bad cell will read 10.5 volts on a voltmeter. Most alternators wont make up the 2 volts while running. The bad cell will drain the battery like a light bulb that wont shut off. A load test on the battery will show a bad cell, the bad cell will boil furiously while on load.
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Old 10-12-2020, 02:03 PM #6
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my vote is alternator.
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Old 10-12-2020, 02:07 PM #7
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I found this thread was a good resource for understanding the cars electrical system.

DIY:CHARGING SYSTEM FULL DIAGNOSTIC(alternator/battery) | Lexus IS Forum
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