Go Back   Club Lexus Forums > Lexus Model Forums > LS Models > LS430
Sign in using an external account
Register Forgot Password?

Alternator replacement?

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 01-05-13, 06:10 PM   #1
yuri.ber
Lead Lap
Trader Score: (7)
 
yuri.ber's Avatar
 
Join Date: Sep 2008
Location: NY
Posts: 519
Default Alternator replacement?

Hey guys. Today while changing battery, mechanic checked the alternator and said its half way done. He said it's putting out 65amps when normal output should be over 100amps.
Anyone changed the alternator in their LS 430's? What mileage it was changed at? What replacement alternator was chosen: new OEM unit, rebuilt Denso unit or rebuilt aftermarket unit?
Should I change it right away or wait until the car will "tell me" to do it?
Thanks for input.
This ad is not displayed to registered members.
Register your free account today and become a member on Club Lexus!
__________________
2001 Lexus LS 430 Ultra Luxury.
Millennium Silver on Black Leather with Rose Wood.
On OEM Sport Shocks and Tanabe NF210 lowering springs, 4 Cross Drilled Rotors, All doors and rear deck Dynamatted, Kicker COMP8 Sub.
yuri.ber is offline   Reply With Quote
Old 01-05-13, 06:49 PM   #2
xuserx04
Lead Lap
Trader Score: (5)
 
xuserx04's Avatar
 
Join Date: Jan 2008
Location: New York
Posts: 596
Send a message via ICQ to xuserx04
Default

I did mine around 250k. Car just died on a highway one day. Was lucky enough to start it up again and get to an off ramp. Got an aftermarket one because I feel an OEM is a bit too much money for my mileage.
__________________
2004 Lexus LS430 ML
xuserx04 is offline   Reply With Quote
Old 01-05-13, 09:16 PM   #3
Bocatrip
Lexus Test Driver
Trader Score: (0)
 
Join Date: May 2006
Location: Fl
Posts: 1,078
Default

My Alternator with around 100,000 miles has been putting out 3.3 volts under load for the better part of the last 2 years when I know that 3.8-4.0 would be optimal. I have never had a problem with starting. I purchased a new 7 year battery (A/C Delco Professional) a few months ago after 3+ years on the prior one for peace of mind. I priced alternators, and a good aftermarket will do the job while saving a few bucks. I am not planning on replacement unless I have any starting problems. Is your car having starting problems or is the charge light coming on?
__________________
Currently Own:
2001 Lexus LS430 Millenium Silver/Nav/ML
2010 Jaguar XK Coupe Liquid Silver
2004 Infiniti G35 Coupe - purchased new. (sold)

Last edited by Bocatrip; 01-05-13 at 09:20 PM..
Bocatrip is offline   Reply With Quote
Old 01-05-13, 09:34 PM   #4
yuri.ber
Lead Lap
Trader Score: (7)
 
yuri.ber's Avatar
 
Join Date: Sep 2008
Location: NY
Posts: 519
Default

Thanks for input.
Car starts fine after battery change today. Mechanic also put AC Delco Professional battery in, said it's very good for its price, I paid $105. My previous Interstate battery lasted for a little over 3 years.
No light on dash too. Mechanic said not to worry and change it when "No charge" light comes on.
__________________
2001 Lexus LS 430 Ultra Luxury.
Millennium Silver on Black Leather with Rose Wood.
On OEM Sport Shocks and Tanabe NF210 lowering springs, 4 Cross Drilled Rotors, All doors and rear deck Dynamatted, Kicker COMP8 Sub.
yuri.ber is offline   Reply With Quote
Old 01-06-13, 06:59 AM   #5
Lynzoid
Lead Lap
Trader Score: (0)
 
Join Date: Jun 2010
Location: RU
Posts: 722
Default

I'd fix it... Mine went last year. If your 'no charge' pops up - that means you toasted your battery already and you will be stranded in next 10mins.
I used a reman shop for this - they replaced diode brigde and some bearings and brushes. Cost me 100usd with unbolt/install and took 2hrs.
Lynzoid is offline   Reply With Quote
Old 01-06-13, 07:05 AM   #6
toyo
Pole Position
Trader Score: (0)
 
Join Date: Sep 2002
Location: Georgia
Posts: 242
Default

Was the mechanic putting the proper load on the system when he checked it? It's pretty rare and very unscientific to say an alternator has 50% of it's life left. I would not replace it until you start seeing a difference in your car. A very good indicator of a faulty alternator is let's say you have your lights on, a/c or heater going, etc. You pull up to a light and sit there. If you notice your lights dim after you have just stopped or brighten up after you take off that's a pretty darn good sign. It's not rocket science, but it happens everytime.
__________________
2013 Toyota Tacoma DCSB 4X4
2008 Toyota 4Runner V8 AWD
2006 LS430 UL Pearl White
2001 RX300 AWD Mineral Green
toyo is offline   Reply With Quote
Old 01-06-13, 07:22 AM   #7
Lynzoid
Lead Lap
Trader Score: (0)
 
Join Date: Jun 2010
Location: RU
Posts: 722
Default

LS is more intelligent that way. It starts cutting power sequentially to non essential systems. Radio goes first, then hvac, then cruise. When i had mine die, hid headlight stayed on till it completely died.
Also, if you have display in your ls, you can access displays diag menu (search) and there you have voltmeter. If you in doubt - check it. If you're below 12v - definitely almost dead.
Lynzoid is offline   Reply With Quote
Old 01-06-13, 07:25 AM   #8
toyo
Pole Position
Trader Score: (0)
 
Join Date: Sep 2002
Location: Georgia
Posts: 242
Default

Lynzoid, please explain the last part of your post in more detail?
__________________
2013 Toyota Tacoma DCSB 4X4
2008 Toyota 4Runner V8 AWD
2006 LS430 UL Pearl White
2001 RX300 AWD Mineral Green
toyo is offline   Reply With Quote
Old 01-06-13, 09:24 AM   #9
94GS300
Driver School Candidate
Trader Score: (0)
 
Join Date: Sep 2001
Posts: 47
Default

Quote:
Originally Posted by yuri.ber View Post
Hey guys. Today while changing battery, mechanic checked the alternator and said its half way done. He said it's putting out 65amps when normal output should be over 100amps.
Anyone changed the alternator in their LS 430's? What mileage it was changed at? What replacement alternator was chosen: new OEM unit, rebuilt Denso unit or rebuilt aftermarket unit?
Should I change it right away or wait until the car will "tell me" to do it?
Thanks for input.
As far as replacing your alternator, here are my recommendations based on my experience with this issue:
1. If money isn't an issue, definitely a new OEM unit is the way to go. However, it can be nearly impossible to find a new OEM unit if the car is older because new ones don't exist anymore. Toyota/Lexus likes to use Denso alternators and they are very good alternators. My experience is the original OEM alternator lasts way longer than any other alternator you can buy.
2. Next best option to getting a new OEM unit is to rebuild the unit yourself. Most people either don't know how to do this, don't want to do this, or don't know where to find the parts so not many people take this route. However, if you know what you are doing you can rebuild your alternator and make it almost brand new for less than what you would pay for one of those "no name" junky reman units. Typically on Toyota/Lexus alternators the bearings, stators, and rotors last forever. Most of the time when an alternator gives out it is because the brushes are worn, the regulator is fried, or the rectifier is toast. Those parts are fairly easy to replace and don't cost a whole lot of money.
3. If you don't want to rebuild it yourself, then find a reputable shop that rebuilds alternators. A good shop will rebuild your alternator with new bearings, brushes, regulator, and rectifier. Most of the time this route is actually cheaper than buying a junk reman one. I would recommend most people take this route.
4. If you don't want to do any of the above, then buy a Denso reman unit. Denso is one of the best reman alternators out there. Bosch is also good. These are more expensive but have much better quality control.
5. The last option would be a reman unit from another manufacturer. Just remember, most reman units don't replace the regulator and rectifier. Most of the time they just slap on new brushes and sometimes new bearings and if the unit passes final test they call it good. The regualator and recitier could be 10 years old but you wouldn't know it until they fail on you in a few months. Sometimes people get lucky but a lot of times they are finding that their reman unit lasts only a fraction of the time their original did.

Again, this is just from my experience. Your OEM alternator is going to have the best quality components and last the longest.
94GS300 is offline   Reply With Quote
Old 01-06-13, 09:46 AM   #10
Bocatrip
Lexus Test Driver
Trader Score: (0)
 
Join Date: May 2006
Location: Fl
Posts: 1,078
Default

Quote:
Originally Posted by toyo View Post
Was the mechanic putting the proper load on the system when he checked it? It's pretty rare and very unscientific to say an alternator has 50% of it's life left. I would not replace it until you start seeing a difference in your car. A very good indicator of a faulty alternator is let's say you have your lights on, a/c or heater going, etc. You pull up to a light and sit there. If you notice your lights dim after you have just stopped or brighten up after you take off that's a pretty darn good sign. It's not rocket science, but it happens everytime.
+1. It's amazing how mechanics can say something a Dr would say and scare the owner to the point of running out and exchanging the part, no questions asked. As I mentioned earlier, my alternator has not been putting out optimal voltage for years and my car has not had any headlight dimming issues or starting problems. Yes, it's true that once the idiot light comes on, you will have to do the replacement realitvely soon, but you more than likely will still not get stranded unless shutting off the car. Our original alternators as the rest of the car's parts are quite durable.
__________________
Currently Own:
2001 Lexus LS430 Millenium Silver/Nav/ML
2010 Jaguar XK Coupe Liquid Silver
2004 Infiniti G35 Coupe - purchased new. (sold)
Bocatrip is offline   Reply With Quote
Old 01-06-13, 09:47 AM   #11
toyo
Pole Position
Trader Score: (0)
 
Join Date: Sep 2002
Location: Georgia
Posts: 242
Default

A new OEM unit will set you back about $700.00 the last time I checked. As the above post states, I would check to see if there is a place that can rebuild your current unit. Won't cost anymore than maybe $125.00 bucks. They will go thru it and replace all pertinent parts, give it an acid bath and it will look brand new.

Alternators are funny creatures. Some units on the same exact car will last the lifetime of the car, another one will go at 100K. My 01 RX with 385K still has the original unit and works perfect. Puzzling.....
__________________
2013 Toyota Tacoma DCSB 4X4
2008 Toyota 4Runner V8 AWD
2006 LS430 UL Pearl White
2001 RX300 AWD Mineral Green
toyo is offline   Reply With Quote
Old 01-06-13, 10:23 AM   #12
BradTank
Lead Lap
Trader Score: (0)
 
BradTank's Avatar
 
Join Date: Jan 2011
Location: AZ
Posts: 539
Default

I'd hold off on replacing it, I think your mechanic is looking for some extra work. If you've had no charging issues and no dash lights have come one, keep running it.

Alternators don't really have a "percentage" of life left to them that can be accurately assessed that way, to say it's "half way done" is complete b.s. It either needs to replaced or it doesn't.
BradTank is offline   Reply With Quote
Old 01-06-13, 10:28 AM   #13
yuri.ber
Lead Lap
Trader Score: (7)
 
yuri.ber's Avatar
 
Join Date: Sep 2008
Location: NY
Posts: 519
Default

Thanks a lot for input guys.
I just checked, alternator assembly at sewellparts.com is $326.11 before shipping and with CL discount. Rebuild Denso unit is ~$185 - $220 plus core replacement fee. Aftermarket unit is ~$100 plus core replacement.
I am definitely not a candidate to rebuild an alternator myself so replacement unit is in order. I think I'll wait till I get a sign or two mentioned here.
__________________
2001 Lexus LS 430 Ultra Luxury.
Millennium Silver on Black Leather with Rose Wood.
On OEM Sport Shocks and Tanabe NF210 lowering springs, 4 Cross Drilled Rotors, All doors and rear deck Dynamatted, Kicker COMP8 Sub.
yuri.ber is offline   Reply With Quote
Old 01-06-13, 11:10 AM   #14
Bocatrip
Lexus Test Driver
Trader Score: (0)
 
Join Date: May 2006
Location: Fl
Posts: 1,078
Default

Quote:
Originally Posted by toyo View Post
A new OEM unit will set you back about $700.00 the last time I checked. As the above post states, I would check to see if there is a place that can rebuild your current unit. Won't cost anymore than maybe $125.00 bucks. They will go thru it and replace all pertinent parts, give it an acid bath and it will look brand new.

Alternators are funny creatures. Some units on the same exact car will last the lifetime of the car, another one will go at 100K. My 01 RX with 385K still has the original unit and works perfect. Puzzling.....
I remember the days of removing my carb, sending into one of numerous shops that rebuilt them and got it back working like new.This applied to radiators, starters, speedometers, etc. Good luck trying to find any shop anywhere that will rebuild what you have. It's now the world of discard and replace. Good luck regardless of what you decide, but I personally would wait a bit longer to see if it becomes symptomatic. . These things can sometimes last longer than you car ownership!
__________________
Currently Own:
2001 Lexus LS430 Millenium Silver/Nav/ML
2010 Jaguar XK Coupe Liquid Silver
2004 Infiniti G35 Coupe - purchased new. (sold)

Last edited by Bocatrip; 01-07-13 at 10:45 AM..
Bocatrip is offline   Reply With Quote
Old 01-07-13, 06:28 AM   #15
Lynzoid
Lead Lap
Trader Score: (0)
 
Join Date: Jun 2010
Location: RU
Posts: 722
Default

Quote:
Originally Posted by toyo View Post
Lynzoid, please explain the last part of your post in more detail?
How to access this menu? Turn off park lights, hold the INFO button right of the display, then turn parking lights on and off 3 times. You should be in the diag menu. Be careful there, don't touch anything to do with 'loading'. You'll find voltmeter somewhere there.
Lynzoid is offline   Reply With Quote
Old 01-07-13, 06:28 AM
 
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Alternator replacement 2005 LS 430 chunkyda LS430 14 08-11-14 08:59 AM
Alternator measured voltage question - in AC and DC mode... peterls LS400 10 09-06-13 01:54 PM
Which new compressor for 92 r12 or r134a WDoherty Performance & Maintenance 4 04-24-13 07:48 PM
DIY 1992 SC400 Alternator Rebuild-- MJHSC400 Performance & Maintenance 33 01-10-13 08:13 AM
Alternator question.. Din SC 400/300 6 08-29-02 02:56 AM


Tags
2001, 2004, 2006, alternator, atlernator, cost, lexus, location, ls430, lx470, mileage, picture, recommended, replacement, replacing, rx300

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 03:07 PM.

Join ClubLexus
Advertising


Copyright © 2000-2008 Internet Brands, Inc. All Rights Reserved
Privacy Policy | Disclaimer | Terms of Use | JOBS


Get all contact info