Question about 1998 Ford Explorer

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My battery light won't go off even though i've had the alternator tested and installed brand new battery

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Well; on your car, the alternator has an internal regulator. have you checked any wires or harnesses that ran off the battery? And see if you may have a cut place on your cables, or if one has come loose from the ground.

Posted on Sep 07, 2009

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THE BATTERY LIGHT CAN STILL ILLUMINATE EVEN IF THE ALTERNATOR IS CHARGING IN SOME CASES,THE REGULATOR WHICH IS BUILT INTO ALTERNATOR CAN TURN LIGHT ON IF IT IS FAULTY, AND THE DIODES COULD DO THE SAME. BOTTOM LINE IS REPLACE ALTERNATOR...THATS WHERE THE PROBLEM LIES. GOOD LUCK!!

Posted on Sep 07, 2009

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Hi there i got 1998 ford focus just been in gargae had new alternator new battery but my battery warning light still on any ideas

Posted on Mar 20, 2010

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If both the alternator and the battery are good, either the alternator isn't turning fast enough (slipping belt or engine idle speed too slow), or you have a wiring problem.

To check your wiring, look for the "1" terminal on the back of the alternator (left side of spade terminal connector). When you turn the ignition key to the run position without starting the engine, the alternator warning light should be at full brightness. If the bulb is burned out, the alternator will not get the excitation current it needs to start up (it goes through the bulb). With the engine running, you should measure 12 Volts at the 1 terminal (this is the excitation terminal).

Another thing to check is whether the battery charge wire is good. If it is corroded inside at the battery clamp end or burned out, you won't get charging even though the alternator appears to be working. If you don't have an ohmmeter, you can make a quick test by adding a new 8 AWG wire between the output terminal and the battery clamp. If the battery now charges, the original wire is bad. If this works, I recommend installing an inline fuse at the alternator end no larger than the largest size used in your electrical system, just in case something happens to the jumper wire. That way you won't burn out your alternator.

The heater/AC issue could very likely be a separate problem, but inadequate power may keep that system from running properly. (Note: low idle speed or belt problems will also be detrimental to AC performance.)

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Sounds like a bad alternator or Voltage regulator. Get the Haynes repair manual on your vehicle and follow the directions for removing the Alternator. take the Alternator to Auto Zone or O'Rielley''s and have it tested. If it is bad you can get a new one then and install it and solve the problem. If it test good then you will need to change the Voltage regulator.

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