Question about 1989 Ford Ranger

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Battery drains while driving. already replaced the alternator and sylinode. what else could it be.

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  • ridindeeep77 Nov 19, 2009

    already replaced the battery

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  • 226 Answers

A bad battery. do a load test on it at a garage.

Posted on Nov 19, 2009

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1992 holden barina charging problem already replaced alternator but still slowly drains battery


It is not charging the battery because of several problems ---1 when connecting up the wires to the alternator was there a spark at the connection ---2 is the heavy wire on the alternator insulated from the body of the alternator--- is there a fuse in the charge circuit that is blown---4 is the light wires pushed fully home in the connection--- have you the correct alternator for the car ( internal or external voltage regulator)---5 is the drive belt in good condition and tight- If everything checks out then take it to an accredited auto electrician to have the alternator tested properly as new alternators ( out of the box new) can be faulty.

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Check all the little lights, in the trunk, interior of the car, even under the hood sometimes, to see if one is stuck on. Find it's switch.

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My 1990 Honda Civic battery keeps draining the alternator is running well between 13 and 14 when the battery got low it started to lose power while I was driving I replace battery in it was already down to...


Not sure I follow your story.
Have you checked the output of the alternator while it is on the engine, and is it between 13 and 14 volts ? Does the battery lose power while the engine is running or after you turn the engine off ?
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Have you confirmed by going out to the car at night that none of the interior lights or lighted visor lights truck or hood lights are staying on? That is by far the most common cause of a battery drain. Other less common cause is a defective alternator rectifier diode Disconnect the battery overnight as well to confirm you don't have a shorted battery cell, that to will run the battery down, it is called an internal drain. Also make sure the top of the battery is clean of any acid.

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My battery keeps dieing while running. just changed the alternater three weeks ago.


Hi.

Make sure that you also replaced the battery. Battery elements may be shorted inside. That will result in battery draining even if the alternator is working.

If you have already replaced the battery check power across battery terminals with engine on and revving above idle.You should read voltage in a range of 13.5/14.4 volts when engine is revving at about 2K rpm.

If the voltage is still wrong after replacing alternator and battery check the voltage regulator connected to the alternator. Here the part.

If battery, alternator and power regulator are OK, test wiring to find out if there is a short to ground that is draining the battery while you drive. This fault is quite unusual with your symptoms. Check battery, alternator and voltage regulator first.

Regards.

Ginko

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or any of several reasons:

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  • The battery is not being recharged while the vehicle is being driven (you have a charging problem)
  • There is a key off parasitic electrical drain on the battery because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator.
  • Your battery is old and will not hold a charge anymore. The battery needs to be replaced.

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1 Answer

Battery drains while driving


the power wire that comes off the back side of the altnator could have a bad connection, I would take the nut off and make sure the connection is good, if it is i would follow the wire all the way over to the battery to make sure there are no brakes in the wire. if there are no brakes in the wire check the connection at the battery, chances are you find something going on with that wire.

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1 Answer

Battery goes dead while driving ck out put on alt ok at the time replaced computer same thing also it may start working ck all elect connection 2000 4x4 jeep cherokee


Hello. If your battery is not charging while driving, often it is due to low or bad voltage from your voltage regulator, which is also in the Alternator usually on these vehicles. Your engine has been running off the battery only and draining it, not using the alternator's power. Here are some things to look for and a question for clarification:

If you actually replaced the alternator already your regulator should be good. But to clarify your problem report, did you replace the alternator or only check it? It may take several checks while truck is running to catch the problem. If you have not done so already you will need to verify that voltage (13.9 volts or more) is actually reaching right to your battery. 12Volts will not be enough, that means something is wrong and is just battery volts. Please do this test while your Jeep is running, with lights on. DC volts across the battery need to be about 14 Volts while all is on. If you don't get that either the Alternator/VR is bad OR bad connection to it.

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1 Answer

Battery being drained and alternator already been replaced


have you checked your drive belt and the tension pully ? it sounds like the belt is'nt turning the alternator fast enough to supply the battery

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