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1999 argo conquest, it quit charging, then after over night it started charging, then after an hour of running it quit charging, is it the regulator?

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I would check the drive belt condition and tension first. Then check that the battery terminals and posts are shiny clean and tight. I would have a output test done on the alternator to check if the regulator is ok or if there is a fault in the alternator like no brushed or dirty slip rings.

Posted on Oct 13, 2013

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Battery being drained over night


Check to be sure that your hood light is turning off when you close the hood. Seriously. (Common problem.)
Remove the bulb from the hood light to see if the problem persists. If the battery no longer drains, replace the hood light assembly.
Also, run the car for a short while, then turn the car off. Leave the car off for an hour, then feel the back of the alternator. If it is hot, the diodes are bad in the alternator.

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What's draining my battery?


1: Faulty Battery: inspect and fill it with distilled water, if needed: battery may be shorted out

2: Alternator: the voltage regulator inside alternator will drain battery when it quits working: break unit open, and replace the regulator: or replace the entire unit with a rebuilt alternator.

3: Loose alternator belt, which slips and does not allow for enough revolutions to fully charge the battery - especially at night-time, when you are running your headlights and such.

Now, to do a test, which will tell you if the alternator has failed, in 10 minutes:

1) Simply loosen, but Do Not Remove, the battery post clamps / cables, from battery.

2) Start Engine.

3) With engine running, REMOVE both cables from battery posts (engine should continue to run) (if it does not / dies out upon removal of cables, then test no further): ensure to secure the positive post cable - wrap it with a rag, or set it on cardboard or rubber, so it does not ground: then reach inside, and turn ON your headlights: upon doing so, and highlights are ignited, if the engine dies out - if the engine quits running the instant you turn your lights on, with the battery cable disconnected off - that means that the alternator is Not Charging; that it is not producing enough current to run itself / maintain itself running / maintain the engine running; so it does not produce enough electricity to keep your battery fully charged - and, is in fact, draining your battery of any available current which was stored in it.

So, more likely then not, it's the electronic regulator / diode stored inside of the large alternator unit: but, because, your car is a 1990, the brushes on your alternator are shot anyway; so you are better off just replacing the whole unit and belt: and battery if need be.

I hope this helps somewhat: where, with ENGINE RUNNING at normal / higher idle speed, and BATTERY DISCONNECTED, and ACCESSORIES RUNNING, especially headlights and heater - the Engine Must Remain ON / Running - on solely alternator power.

In that: the battery is only required to start the car; stored energy / current for the purpose of starting the car, as supplied by the alternator - and adjusted by the regulator: a faulty regulator will fry your battery, by over-charging / allowing too much electricity to flow.

Good Luck,

Ray

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I have a 1999 Lexus LS-400. Appears to have charging problems (ABS, VSC, & Battery lights on). While running if I disconnect red terminal, car remains running (alternator). Starter checked was OK....


firstly check with your car scanner ,read for fault code, as my experience the alternater fault due to leak in alternator regulator ,check with multimeter for your voltage, at least with light and air con on, it should at least 13.6volt.normally with alternator light on when engine running.conform alternator,replace one thank you

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Yup, time for a new alternator. Most models have the regulator built into the alternator, so it makes it a little bit more expensive - but it will resolve your problems. If you are driving at night with a load on your charging system (lights and radio on), you will probably notice you have dim headlights. If you don't change it soon, you'll end up having to replace your battery too.

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Sounds like the fuel pressure regulator is leaking try and locate the fuel rail and find the regulator remove the vacuum hose and have some one turn the key on it leaks gas its bad. Note on some of the 4.3L engines the regulator in under the intake

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