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Old 11-03-2022, 08:18 AM #1
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Density Alternator Question

I appreciate this forum and all the great info on here. I have looked through a lot of previous threads before I posted this one so here is my question

When everyone says get a Denso alternator, is there a model specific? On RockAuto, there is model 2100434 for around $200. Toyota has a remanufactured one for almost $375. I believe I need an alternator since mine is original and have a 2000 with 169,000 and my battery light is on. Battery is about 6months old. I also plan on keeping the original and rebuilding it to have as a backup
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Old 11-03-2022, 11:40 AM #2
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When I bought my 97 it came with a CarQuest reman. 5 years later the brushes were shot so I put OEM brushes in from Toyota.

A reman is still a OEM Denso Alt. It’s just that if you buy a reman from Denso it’s suppose to have the same quality parts as when it was new.


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Old 11-03-2022, 02:11 PM #3
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Like @19963.4lsr5 mentioned, I'd first try replacing the brushes before dropping coin on a replacement alternator. It's very well possible all you need is a new set of brushes and I have the video below you can use as a tutorial to get it done. If you are going to go the replacement route, I'd definitely by a remanned Denso alternator.

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Old 11-03-2022, 02:43 PM #4
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One quick way to determine if the brushes are worn is to tap the alternator housing with a hammer. More often than not, the vibration will cause the worn brushes to reposition slightly, contact will improve, and the battery light will go out. Old tip from a Toyota mechanic I work with.

I was in the same boat as you though. I wanted to rebuild mine, but the slip rings were completely worn out. I bought the Denso reman from Rockauto instead.
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Old 11-03-2022, 09:32 PM #5
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For my 97, I bought a reman Denso (from densoproducts.com which is really sparkplugs.com) for a 2000 4Runner so I could go from 70 amp to 80 amp. 80 amp one fits with no hassle, uses same belts, etc. Current price $202.57 Mine has been in service for a bit over a year w/o problems. As expected.
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Old 11-04-2022, 06:56 PM #6
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Quote:
Originally Posted by 19963.4lsr5 View Post
When I bought my 97 it came with a CarQuest reman. 5 years later the brushes were shot so I put OEM brushes in from Toyota.

A reman is still a OEM Denso Alt. It’s just that if you buy a reman from Denso it’s suppose to have the same quality parts as when it was new.


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Thank you for the information! That’s what I needed to know
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Old 11-04-2022, 07:00 PM #7
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Quote:
Originally Posted by mtbtim View Post
Like @19963.4lsr5 mentioned, I'd first try replacing the brushes before dropping coin on a replacement alternator. It's very well possible all you need is a new set of brushes and I have the video below you can use as a tutorial to get it done. If you are going to go the replacement route, I'd definitely by a remanned Denso alternator.

First thank you for all the helpful videos, I’m sure you get that a lot from everyone, but it’s a lifesaver for guys like me who want to learn and need a little extra confidence in wrenching.

Thanks for the information. I’ll buy a new one and put it in, then repair the original since I’d rather not be stranded in the middle of no where without service-since that’s where I fish a lot.
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Old 11-04-2022, 07:02 PM #8
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Quote:
Originally Posted by jlaho View Post
One quick way to determine if the brushes are worn is to tap the alternator housing with a hammer. More often than not, the vibration will cause the worn brushes to reposition slightly, contact will improve, and the battery light will go out. Old tip from a Toyota mechanic I work with.

I was in the same boat as you though. I wanted to rebuild mine, but the slip rings were completely worn out. I bought the Denso reman from Rockauto instead.
Thats good to know. I’ll have to try that this weekend before I order a new one. Thanks for the information! Yeah, I’d rather not be stranded at the worst time.
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Old 11-04-2022, 07:02 PM #9
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Quote:
Originally Posted by pluton View Post
For my 97, I bought a reman Denso (from densoproducts.com which is really sparkplugs.com) for a 2000 4Runner so I could go from 70 amp to 80 amp. 80 amp one fits with no hassle, uses same belts, etc. Current price $202.57 Mine has been in service for a bit over a year w/o problems. As expected.

🤙🏼🤙🏼🤙🏼 Sweet good to know. I’ll shop around and take a look there. Thanks!
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Old 11-05-2022, 12:49 AM #10
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Quote:
Originally Posted by SC_4RunnerSC View Post
First thank you for all the helpful videos, I’m sure you get that a lot from everyone, but it’s a lifesaver for guys like me who want to learn and need a little extra confidence in wrenching.

Thanks for the information. I’ll buy a new one and put it in, then repair the original since I’d rather not be stranded in the middle of no where without service-since that’s where I fish a lot.
You're very welcome. Hope the swap goes smooth for you. Happy Wrenching!
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Old 11-05-2022, 10:19 AM #11
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Removing the plug in the back of the Alt can be a bugger.


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Old 11-05-2022, 05:31 PM #12
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Removing the plug in the back of the Alt can be a bugger.


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You ain't kidding. The last time I removed one, I unbolted the alternator first and got the alternator in a position where it was more comfortable for me to get my hand on the connector to release it. Even then it was a hassle to remove.
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Old 11-05-2022, 07:44 PM #13
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I unbolt and move the alt to unplug them. Then I use hose plyers to hold the clip down and wiggle the wire out.

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Old 11-06-2022, 02:06 AM #14
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I wished I had removed the battery before I swapped my alternator out.
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Old 11-06-2022, 09:33 AM #15
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I wished I had removed the battery before I swapped my alternator out.

It does open the area up for your arms.


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