04-28-2023, 07:19 PM
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#1
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Alternator voltage with engine running
Troubleshooting a potentially bad alternator - 2007 V6 @ 163k. Believe it’s the original alt. Tested voltage at the alternator lead with truck running, and got about 0.03v. Even if the alt bad, shouldn’t this still read around 12.6v? Makes me wonder if there’s a bad connection b/t alt and battery.
Batt voltage w/ engine running was 12.5v. I know that means it’s getting nothing from alt.
140a fuse looks ok. Is there another fuse for it?
Checked ohms from batt to alt and got 0. Any other test I could do to rule out wiring?
Thanks to anyone who could chime in!
Last edited by Toystory2; 04-28-2023 at 07:25 PM.
Reason: More info
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04-28-2023, 07:29 PM
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#2
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did you check the alt-s fuse? that is the charging fuse i think.
also your brush might be worned.
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Last edited by riceandpho; 04-28-2023 at 07:32 PM.
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04-28-2023, 07:34 PM
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Quote:
Originally Posted by riceandpho
did you check the alt-s fuse? that is the charging fuse i think.
also your brush might be worned.
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I checked the 140a in the fuse box, is this a different one? If so, where is it located?
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04-28-2023, 07:38 PM
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its in the fuse box also, its the smaller ones. your fuse box cover will show
7.5amp
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Pioneer DEH-80PRS,Rockford Fosgate T600-2,Hertz ML 1650.3(2 pairs),T400-2,Hertz ML 280.3(2 pairs),T1000-1bdcp,(2)JL Audio 12W6v3, Mechman 240a HO Alternator, Dual Northstar 31m,Borla Dual Exhaust,AFE Magnumforce intake.Enkei WT-4 Michelin Defender LTX 275/55R20. retrofitted S2000 projectors,Philips 85122 White Vision,Morimoto 5Five Ballast.Diode Dynamics SS3 Yellow Fog Sport.2 pairs of Hella Supertones.Full led conversion on interior and exterior.HAWK LTS pads F+R, Stoptech slotted rotors and stainless steel lines F+R.Bilstein 5100 @0.85, MOOG FJ Springs front,Bilstein B12 36-281824 rear .
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04-28-2023, 08:54 PM
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#5
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Quote:
Originally Posted by riceandpho
its in the fuse box also, its the smaller ones. your fuse box cover will show
7.5amp
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Thank you kindly, I’ll check it out
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04-29-2023, 05:52 AM
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#6
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Quote:
Originally Posted by Toystory2
Checked ohms from batt to alt and got 0. Any other test I could do to rule out wiring?!
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Resistance is not the correct test - you need to look at voltage drop.
https://www.youtube.com/watch?v=EMS8On17BnM
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Last edited by Buckaroo; 04-29-2023 at 06:01 AM.
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04-29-2023, 10:51 AM
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Quote:
Originally Posted by Buckaroo
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Thanks for the tip. Just ran this test and got between 0.02 -0.09 on the positive circuit. Got 0.0 on the negative circuit. So looks like there’s not much drop at all.
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04-29-2023, 07:55 PM
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#8
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So wiring looks good. If you are going to replace it, I suggest Denso Reman from RockAuto....
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2000 T4R SR5 V6 (Retired) & 2005 T4R Limited V6
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04-30-2023, 10:14 PM
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#9
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Quote:
Originally Posted by Buckaroo
So wiring looks good. If you are going to replace it, I suggest Denso Reman from RockAuto....
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Thanks, I got a Toyota reman from EBay, which I believe is Denso anyway.
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04-30-2023, 10:36 PM
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did you consider doing a high output alternator?
any large electrical add ons?
im using the mechman 240a, its pretty good for my needs
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05-01-2023, 01:53 PM
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#11
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Quote:
Originally Posted by riceandpho
did you consider doing a high output alternator?
any large electrical add ons?
im using the mechman 240a, its pretty good for my needs
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I don’t have any add-ons, but you bring up a good point. Now would be the perfect time to upgrade if I was going to.
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