Question about 2000 Lexus RX 300

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

My lexus rx300 has a new battery,new belts,alternator is cranking out 13.4 amps other two areas tested good, and now the belt is squeaking when the air is turned on each time and the battery light comes on at the same time. Air is cold. also would not start two different time in a period of two week on first turn , but did second.just sounded like there wasnt even a battery hooked up.Help

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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.

Posted on Jul 16, 2010

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How do I tell if I need a 100 amp or 130 amp alternator for a 2001 Lexus rx300. I already have an aftermarket alternator so I don't know what the original is.


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1999 Lexus RX300 wont turn over no sound


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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?


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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

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

How to tighten belts on a 2002 Lexus RX300


Bring it back to the dealer, tell them they squeck. new belts should not squeck. Squeaking means they are too loose or have fluids on them. If they're not shiny, the're loose.

Sep 16, 2009 | 2002 Lexus RX 300

2 Answers

When do you change timing belt on 2002 lexus rx300


Every 90,000 miles or 72 months per manufacturers recommendations.

Feb 22, 2009 | 2002 Lexus RX 300

1 Answer

Battery discharging/lights pulsing


i would say that the regulateur on the altentor under pressure can not supply the charge. it might test good but it's not just have a shop replace your alternateur and that should solve your problem.hope this works for you .

Jan 05, 2009 | 1999 Lexus RX 300

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