Question about 2003 Lexus RX 300

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I need to replace the alternator for my wife's 2003 Lexus RX300. Do I buy a 100 amp or a 130 amp alternator, and does it matter?

Battery is good but won't hold a charge, so assume the alternator is the problem. I don't know anything about locating the alternator in wife's car, so don't know whether or not to buy a 100 amp or 130 amp alternator. It is a 2003 3.0 Lexus RX300.

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  • Lexus Master
  • 14,036 Answers

You need take old alternator with you to auto parts stores they can match up your alternator give you the correct AMP TYPE, your alternator amps is stamped on the out side alternator housing, the auto parts store can look up right amp alternator for your vechicle.when you say dont matter yes it does if you get wrong type alternator, your battery wont have good charge causing alternator fail early and battery fail early.

Posted on Feb 13, 2012

Testimonial: "Thanks. I assumed this was the case, but you have helped me locate the amp signature. I appreciate this help."

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6ya6ya
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Posted on Jan 02, 2017

keithheavili
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SOURCE: ? to Replace Timing belt on 2000 Lexus Rx300 with 57,000 miles.

If it is running perfectly I wouldn't think that you would need to replace the timing belt. You shouldn't need to replace that until 100,000-120,000 miles. I would definitely hold off until now unless you have start having some timing problems. Let me know if you have any other questions. Thanks for rating my response and for using FixYa!

Posted on Jul 08, 2009

  • 17 Answers

SOURCE: replace side marker light on lexus rx300

Remove 3 - 4 screws on fender cover close to side marker light. Pull fender cover out a bit for you to use your other hand to reach side marker light. By twisting on one direction and here you go the light out. Replace new bulb and replace everything on reverse order.

Posted on Aug 18, 2009

  • 17 Answers

SOURCE: Replacing outer tail light on Lexus RX300 ?

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Lift the hatch. The tall center light is located behind the upper hatch inside panel. There are two panels need to remove. One panel is on the right, the other on the left. To remove the panels you have to use flat screw driver to pry out the panel in several locations. (These panels are secured by several small metal clips.) Be careful to collect all these clips and replace them on the back of the panel. You will need these clips to replace the panel later on. After remove the panels, you will be able to locate the screws on the tall center stop light assembly. Remove those screws and cover. After replacing light bulb. Assemble everything in reverse order. Remember, the metal clips have to set on the back of the two panels not the car body.

Posted on Aug 18, 2009

Murphybanton
  • 2004 Answers

SOURCE: Lexus RX300 engine light n VSC light comes on

VSC means Vehicle Stability Control.

It comes on when the sensor send a signal that the vehicle is not stable on the ground.....check the wheel balancing and alignment and the air pressure of your tires too.

Good luck.

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Posted on Aug 23, 2009

  • 430 Answers

SOURCE: changing rear wiper fluid in a 99 lexus rx300

Nothing to change, add fluid to the reservoir in front. Lack of rear fluid could indicate a bad pump or hose connection feeding to the rear area or clogged sprayer tip

Posted on Jan 07, 2010

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2000 lexus RX300 transmission problem


Are you check trans fluid levels? Sound like a problem with the torque converter or internal valve body solenoids clugged. I suggest check with your technician before to buy or think in replacement parts.

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Alternator


Vehicles: any failing to keep its battery charged.

A vehicle unable to charge its own battery has one of 4 problems:
(a) alternator failure
(b) voltage regulator failure
(c) battery failure
(d) wiring problem between battery and alternator/voltage regulator.

One most modern vehicles (including 2002 Lexus RX300 - 2WD and AWD), the voltage regulator is an integral component of the alternator and is not separately serviceable.

In the US, one can get a free "charging system diagnosis" from the popular auto parts chains: AutoZone, Advance Auto Parts & Pep Boys. You needn't remove any parts from the car to get this diagnostic, since they can attach a diagnostic meter to the charging system in the parking lot. This diagnostic aid will tell you exactly which component has failed - battery, alternator or voltage regulator.

In case the vehicle is immobile, one can DIY (do it yourself) the diagnosis.
(a) inspect the wiring for corrosion/loose connections/loose connectors/etc.
(b) check alternator belt/pulley - if drive belt is properly turning the alternator pulley (no slippage/misrouting/etc.), then the mechanical tests are complete, and you'll need to continue testing the electrical performance of the charging system components.
(c) first component to test: battery
DIY test 1: remove battery from car and put battery on a 120VAC automotive battery charger and charge it fully (or just check it in the car with motor off, since the car's charging system is a type of automotive battery charger).
test parameter: a fully charged lead-acid automotive battery should read 12.45 volts on a VOM/DMM
DIY test 2: disassemble battery out of car after driving it to one of the auto parts chain stores (Advance/AutoZone/Pep Boys) for a free battery test. These testers will test the battery under load, which is not possible with just a DMM.
(d) if wiring is good, and battery tests good under load, then
the failed component is the alternator/voltage regulator - by process of elimination.
(e) DIY test 3: direct alternator/voltage regulator test (car must start and idle successfully to perform this test)
Start the car, and put a VOM/DMM across the terminals of the battery. Since the car is running, you'll be reading the output voltage of the alternator and not the output voltage of the battery. The acceptable ranges for alternator/voltage regulator output are:

ALTERNATOR CHARGING VOLTAGE

Most alternators that are charging properly should produce a voltage of about 13.8 to 14.2 volts at idle with the lights and accessories off. Always refer to the vehicle manufacturer's specifications. Many Asian vehicles, for example, have higher charging voltages of around 15 volts.

When the engine is first started, the charging voltage should rise quickly to about two volts above base battery voltage, then taper off, leveling out at the specified voltage.

The exact charging voltage will vary according to the battery's state of charge, the load on the vehicle's electrical system, and temperature. The lower the temperature the higher the charging voltage, and the higher the temperature the lower the charging voltage. The "normal" charging voltage on a typical application might be 13.9 to 15.1 volts at 77 degrees F. But at 20 degrees F. below zero, the charging voltage might be 14.9 to 15.8 volts. On a hot engine on a hot day, the normal charging voltage might drop to 13.5 to 14.3 volts.

Here are the full specs for installation of the 2002 Lexus RX300 alternator - you may be able to check these specs yourself (with a torque wrench), or pass them along to your mechanic.

Note: the VIN 8th digit should be "F" for the 2002 Lexus RX300 (2WD & AWD)

2002 Lexus RX300 (2WD and AWD) - 3.0L Engine, VIN "F" SFI DOHC

Alternator

Drive belt. Tension the belt to 170-180 lbs. for a new belt or 95-135 lbs. for a used belt.
Adjusting alternator lockbolt. Tighten the bolt to 13 ft.-lbs. (18 Nm).
Alternator pivot bolt. Tighten the bolt to 41 ft.-lbs. (56 Nm).

Glossary of acronyms
--------------------------------
DIY = do it yourself
DMM = Digital Multimeter
DOHC = Dual Overhead Cam
SFI = Sequential Fuel Injection
VOM = Volt Ohmmeter

References
----------------
How to test a Car Alternator - todayifoundout.com

Alternator & Charging System Checks - aa1car.com

Dec 26, 2011 | 2002 Lexus RX 300

2 Answers

I have lost my lexus remote control key. how and where can i buy a new one through the net. thank you..


Hi,

Buy it from :-

http://cgi.ebay.com/ebaymotors/2001-2002-2003-LEXUS-RX-300-RX300-KEY-REMOTE-KEY-_W0QQcmdZViewItemQQitemZ120607853494QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

I hope i have been helpful.

Thank You!!

Aug 21, 2010 | 2001 Lexus RX 300

1 Answer

My lexus rx300 new belts are squealling,battery light on,


as the a/c motor is a pump (resistance to turning),if the belt is not adjusted correctly(too loose)it will squeel,and the alternator will not produce enough power to keep the battery charged up.you should always retension the belts after about 1k/1 month after fitting new.
adjust so that the longest run of the belt, between pulleys, has 1/2"flex

Jul 16, 2010 | 2000 Lexus RX 300

1 Answer

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It sounds like you have loose belt(s). When the A/C is turned on, it puts a big load on the belt, if it is loose and starts slipping and squeeling, then the alternator won't turn, so the battery runs down as you drive. Make sure all your belts and battery terminals are tight.

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