Question about 1987 Toyota Land Cruiser

2 Answers

Not charging at low idle

When the engine is at low idle, the alternator is not keeping up

Posted by on

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 119 Answers

Some times when the alternator brushes is short can be,.so check alternatoe brushes.

Posted on Nov 07, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 42 Answers

How have you determined "not keeping up"?

We need to diagnose whether the culprit is the alternator or battery (or something else like an accessory drawing more than normal current)

With a digital voltmeter (not analog) , measure battery with car off, then compare battery at idle.
Off reading = about 12.6 - 12.8 volts DC
Idle reading must be higher than above or no charging will take place, Idle volts typically 13 - 13.5 and should increase a bit with RPM until regulator limits the increase.

Some possibilities are :

  1. bad diode in alternator (can be replaced separately in many alternators)
  2. bad regulator (built-in to modern alternators)
  3. bad connection at battery terminals (wire brush or use battery terminal cleaning tool)
  4. bad battery (shorted cell, often caused by allowing water level to go below tops of lead plates)

Posted on Oct 25, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

My car engine drop so low whenever my acc is on?

Probably using the AC takes a lot of power. Requires the alternator to keep the battery charged, drawing more power making the engine to slow.
The same thing happens when you press on the brakes, but not as obvious.

May 07, 2015 | Cars & Trucks

3 Answers

Where do I find the voltage regulator on a 2005 kia Sedona 3.5L

exactly whay john said. always check the least expensive first. also check tension on belt

Nov 16, 2014 | 2005 Kia Sedona

1 Answer

My battery light keeps coming on in sporadic manner. It will start fine at times.

If your engine idles too low, below 600 RPM, then this will often cause a drop in charge to the battery. The alternator needs to spin at a given rate to provide enough amps for charging.

Nov 02, 2012 | 1996 Ford Taurus

1 Answer

1998 Dodge Neon. At low speed or idling, the headlights pulse. They seem to pulse in time to the idling of the engine.

You need to check the amperage output of your alternator. Sounds like it is either too low of rpm`s from your engine or your alternator/regulator is going bad.

May 05, 2011 | Dodge Neon Cars & Trucks

1 Answer

Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...

OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.

Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

Nov 06, 2010 | 1999 Buick LeSabre

1 Answer

My truck will start with a jump but will shut off. battery checked ok,alternator checked ok.plenty of gas. runs at high idle shutsoff at low idle. whats wrong?

if the battery is ok why do you need to jump anyway? most likely its not ok, the alternator do not provide enough power at idle to supply the engine the amount of power needed to keep it running,below 1200rpm you actually use the battery, in the range of 1400 to 2000rpm the alternator will produce a surplus enough to recharge the battery, but if the battery is old it does not recharge enough to start your truck

Dec 15, 2009 | 1996 Dodge Dakota

2 Answers

1998 k1500 5.7l 105a alternator. replaced

Now change the sulfated batery for a new one.

Sep 09, 2009 | 1998 Chevrolet K1500

1 Answer

Idle very low then turns off

this is the cause.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Jun 11, 2009 | 2003 Toyota Camry

2 Answers

Rough Idle or stall when stop or slowing down.

yes the alternator can send dirty ..too high...or too low a voltage to the system causing all sorts of gremlins.. test test

Jan 14, 2009 | 1994 Nissan Altima

Not finding what you are looking for?
Cars & Trucks Logo

851 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

69014 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22026 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6817 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides