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Old 04-22-2019, 09:47 AM #16
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Maybe the original alternator was rebuilt
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Old 04-22-2019, 11:22 AM #17
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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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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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Old 04-22-2019, 06:11 PM #18
Whiskey & Wrenches Whiskey & Wrenches is offline
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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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Old 04-23-2019, 12:34 AM #19
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07 v6, 193k OG alt and starter
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Old 04-23-2019, 08:07 PM #20
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230K and still working factory fresh!!
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Old 04-24-2019, 12:17 AM #21
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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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Old 05-04-2019, 02:31 PM #22
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233k miles and still on the original alternator. V6 2003 SR5 4WD
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Old 01-23-2021, 05:14 PM #23
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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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Old 01-23-2021, 10:24 PM #24
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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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Old 01-23-2021, 10:54 PM #25
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288K original starter and alternator 03 V8
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Old 01-23-2021, 11:20 PM #26
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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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Old 01-24-2021, 12:05 PM #27
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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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Old 01-24-2021, 01:12 PM #28
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Quote:
Originally Posted by Seymore Butts View Post
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.
Is it possible to replace the brushes with the alternator still installed?
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Old 01-24-2021, 02:04 PM #29
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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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Old 01-24-2021, 09:30 PM #30
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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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