04-22-2019, 09:47 AM
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#16
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Join Date: Nov 2018
Location: California
Posts: 49
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Join Date: Nov 2018
Location: California
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Maybe the original alternator was rebuilt
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2004 4Runner Limited, v8, 4WD
Overlanding Travel App for iPhone
"Great things are done when men and mountains meet." -William Blake
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04-22-2019, 11:22 AM
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#17
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Senior Member
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Join Date: Dec 2015
Location: Colorado
Posts: 1,181
Real Name: Ron
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Join Date: Dec 2015
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Among my son, daughter, and me, we own 5 4runners of 2nd, 3rd, and 4th generations, with mileages of 180K, 220K, 280K, 300K, and 300K (miles). As far as I know, all are running on the original starters and alternators.
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2006 Sport Edition, V8, 206K miles, 2.5/1.5" OME lift, SPC adjustable UCA's, 255/75/17 BFG KO2's load range C @ 40psi. Regeared diffs to 4.30, with TrueTrac in rear.
1994 SR5, V6, 5-spd, Aussie locker front, Aisin manual hubs, Truetrac rear, 33/10.50/15 BFG KO's, stock suspension, OBA (Viair 400C), Front Range Offroad twin stick, 225K miles. Dual 2.28 transfer cases, for a 90:1 crawl ratio.
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04-22-2019, 06:11 PM
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#18
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Join Date: Oct 2017
Location: San Antonio, TX
Posts: 38
Real Name: 2004 SR5 V6 4WD
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Join Date: Oct 2017
Location: San Antonio, TX
Posts: 38
Real Name: 2004 SR5 V6 4WD
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My 4Runner has a little over 200,000 and I'm still running the original alternator and haven't had any problems.
My last car was a Honda Accord, the original alternator lasted over 330,000 miles before it gave up the ghost.
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2004 SR5 V6 4WD
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04-23-2019, 12:34 AM
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#19
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Join Date: Sep 2010
Location: SLC UT
Posts: 18
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Join Date: Sep 2010
Location: SLC UT
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07 v6, 193k OG alt and starter
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04-23-2019, 08:07 PM
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#20
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Join Date: Apr 2019
Location: Ocoee
Posts: 13
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Location: Ocoee
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230K and still working factory fresh!!
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04-24-2019, 12:17 AM
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#21
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Join Date: Aug 2013
Posts: 45
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Join Date: Aug 2013
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Mine is still going strong at 242k, along with no skid plate underneath and no splash guards in the wheel wells for a long time as well.
I also did the voltage mod to get an extra .5 to 1 volt to my odyssey battery. Puts out 15v when cold and 14v when warmed up.
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05-04-2019, 02:31 PM
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#22
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Join Date: Dec 2007
Location: San Jose, CA
Posts: 723
Real Name: Mike
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Location: San Jose, CA
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Real Name: Mike
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233k miles and still on the original alternator. V6 2003 SR5 4WD
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2003 V6 BLACK SR5 4X4-Runner
OB #1334
https://www.instagram.com/ob_1334/?hl=en
Dad's Travel Service.
We drive around till we find it. No map's needed!
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01-23-2021, 05:14 PM
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#23
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Join Date: Aug 2017
Location: Houston
Posts: 8
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Location: Houston
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Replaced alternator (Denso), serpentine belt (Bando), and valve cover gaskets (stone) @323K miles... I am the 2nd owner just over 100K miles myself...
From the looks of the belt, and gasket I'd say original, guessing alternator is too...
03 4Runner V6 Sport
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2003 4Runner Sport V6 2wd, close to 270k
2nd owner, running like a champ...
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01-23-2021, 10:24 PM
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#24
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Join Date: Jan 2021
Location: San Diego
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Yes it's possible to be the original. Might be worth getting a Scan Gauge or Ultragauge to keep an eye on alternator voltage output.
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01-23-2021, 10:54 PM
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#25
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Join Date: Sep 2012
Location: Middle TN
Posts: 173
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Join Date: Sep 2012
Location: Middle TN
Posts: 173
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288K original starter and alternator 03 V8
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2003 4Runner SR5 V8
319k and counting...
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01-23-2021, 11:20 PM
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#26
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Join Date: Dec 2020
Location: Nowhere Special
Posts: 676
Real Name: Special Ed
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Real Name: Special Ed
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I have the original in one '04 Sienna that now has over 500k highway miles on it.
The '03 crapped out around 260k with mixed driving.
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N̷̢̗̪̗̞̯͈̥̐̉͌͜͝O̴̢̨͚̭͕̾B̶̪̩̙̰̩̟̪͓̠̫̉̏̀͗̀̾͒̏̐̽O̵̾̏̈ ̨̡̖̬̀͂̒͂͂̃D̷̯̪͙͍͖͙̰͒̈Y̸͎̗̝͍͌̑̆͂̈́͘̕
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01-24-2021, 12:05 PM
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#27
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Join Date: Sep 2017
Location: Colorado
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Join Date: Sep 2017
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Most of the alternator failures are due to brushes wearing out. I recently replaced mine with an OEM set that I got at the dealer for about sixteen bucks as a PM action. It was an easy job, and after seeing how much black dust fell out when I removed the old brushes after 130K miles, I was happy to have a brand new set installed. My voltage monitor is constantly 0.2 to 0.3v higher than it was before the brush replacement. I'll keep doing that until the bearing goes out. Give it a shot, and you may have many more years left in the original alternator.
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01-24-2021, 01:12 PM
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#28
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Join Date: Nov 2016
Location: South Carolina
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Real Name: Skip
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Quote:
Originally Posted by Seymore Butts
Most of the alternator failures are due to brushes wearing out. I recently replaced mine with an OEM set that I got at the dealer for about sixteen bucks as a PM action. It was an easy job, and after seeing how much black dust fell out when I removed the old brushes after 130K miles, I was happy to have a brand new set installed. My voltage monitor is constantly 0.2 to 0.3v higher than it was before the brush replacement. I'll keep doing that until the bearing goes out. Give it a shot, and you may have many more years left in the original alternator.
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Is it possible to replace the brushes with the alternator still installed?
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2004 Limited V8
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01-24-2021, 02:04 PM
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#29
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Join Date: Sep 2017
Location: Colorado
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No, you need to remove the rear cover and then take out two tiny screws that secure the brush holder. No chance doing it blind.
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01-24-2021, 09:30 PM
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#30
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Junior Member
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Join Date: Aug 2017
Location: Houston
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323K miles, I believe my alternator was original... Denso replaced with Denso 210-0541
Well finally fight, the alternator bolts off... More PB and a breaker bar... Got new on (Denso), rerouted the belt... But I knew battery was too low to start, so put on a portable starter for some extra juice, but wanted to start it on its own... BAM, good to go... RAN last 30mins just fine, no battery light. revved RMPS to 2k twice... Idle is good...
So alternator, valve cover gaskets and serpentine belt, DONE....🙏✔🥱
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2003 4Runner Sport V6 2wd, close to 270k
2nd owner, running like a champ...
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