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Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into the alternator?

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The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

Posted on Jul 26, 2013

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SOURCE: Bench Test explorer 1998 rear wiper motor

power is wht/or & blk/blu. to make the wiper move both left and right across window, it alternates positive and negative polarity.

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SOURCE: 2002 monte carlo will not charge has a new battery

When the engine is running fast idle, the battery voltage should read 13.5 to 14.5 volts if the alternator is delivering charge to the battery. If the old alternator had a shorted diode, the very high current from the battery back through that diode will burn out what is known as a fuse link which is located within the wiring harness and it will effectively disconnect the alternator output from the battery. The battery end is connected at the starter terminal where the positive battery cable also connects.

Posted on Aug 18, 2009

85cj7
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SOURCE: I get 14 to 16 volts at the alternator and only 12 at the battery

when running your car ur battery should be around 12.4v to 13.2v ur car runs off the alternator and should be putting out more the 12 volts bc of all the assesories in ur car need more then 12volts there are no problems with ur car it should be like that

Posted on Nov 17, 2009

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SOURCE: Ford Taurus Not Charging

check alternator, could ther be a short some where?

Posted on Feb 24, 2010

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SOURCE: 1995 mystique, battery light is on, 12 volts

Was the old alternator tested to see if it was bad? If it was and all wires are in good shape and reconnected the new alternator the new one may be bad also. It can happen.

Posted on Jul 16, 2010

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Hooked up my new battery backwards, blew the main fuse. It has been replaced and now the meter fuse in the inside fuse box blows within seconds and gage cluster and alternator not working


Could have damaged regulator. When the car is running have you checked the voltage at battery terminals. If battery is charging it should be around 14 volts. If around 12 your charging system is fubar.

Meanwhile if you have to charge the car every day then something in the car is draining the battery, Using an ammeter you need to track it down, Hook it up to battery and pull fuse out one at a time till the drain goes down. That isolates the circuit with the problem.

Dec 03, 2015 | Cars & Trucks

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If my battery got hooked up backwards in my car and I replaced everything I needed to and got it running and now alternator isn't charging battery, could it be the plug on alternator? The points?


If you hooked up the battery incorrectly you may have blown a diode in the alternator so have it checked out as it will not charge if it has blown a diode

Jul 26, 2013 | Cars & Trucks

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Hooked up battery backwards on 1992 explorer, not getting any spark. Traced everything back to the coil pack. Could it need a new coil pack


most likely fried the ecm. run 12 volts to coil pack positive side a see if you get it to crank. oh by the way check that battery is installed correctly and that it is putting out 12 volts

Jul 20, 2013 | Cars & Trucks

1 Answer

2001 ford explorer sport wont charge


I'm not sure if you have all of the info you need to go forward with this.
The battery may be rated for 800 amps but could have less than 12 volts if the alternator is not charging it.
It could have a dead cell which would keep it from holding a charge.
You would need to check the charge of the battery with a volt meter, then see if the alternator is charging at 14 volts when the engine is running. The battery should be at least 12 volts with the engine off.
The problem could be in the wiring from the key switch or dash gauges back to the alternator.

Jan 26, 2013 | 2001 Ford Explorer Sport

2 Answers

My volvo s60 wont turn over but theres power in the battrie


Anything less than 12.6 volts, at the battery---is a battery that needs to be charged

Not going above 12.4 when the engine is running ---would indicate
your alternator isn't working,is that what you were told

Jun 08, 2012 | Volvo S60 Cars & Trucks

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REPLACED STARTER THEN RECHARGED BATTERY CAR STARTED FINE THEN DROVE FINE THEN GAGES ON DASH STARTED GOING CRAZY ALONG WITH RADIO THEN CAR ACTING LIKE IT WANTS TO DIE NOW WONT START


sounds like your battery is dying,, have it LOAD tested,, it could show 12 volts, but the amperage isn't up to par,, even with one bad cell the battery will drain , also,, once you know its fully charged, start the vehicle,, use a meter at the battery posts to check the voltage,, you should get a reading of 13.5-14.5 volts, if not your alternator isn't doing its job, make sure all battery connections are clean and tight.

Sep 11, 2011 | 2002 Ford Explorer

2 Answers

1995 explorer new battery new alternator battery light still stays on battery goes dead within-2 hours of driving any hints top look for?


Hello, the battery light on your Ford is controlled by the voltage regulator. If the light is on it's indicating the battery is not charging, and is being discharged. If you have a volt meter you can test at the battery. With the engine running the voltage should read at least 13.5vdc. If it's lower than that, the alternator is not charging, or the charge is not reaching the battery. Another simple test, is remove the negative battery cable, if the engine dies the alternator is not charging. Autozone will test your alternator and your battery for free, if you do not have any test equipment. If you just replaced the alternator and it failed the test, it should be under warranty. Same with the battery.

I hope this information is helpful.

Sep 03, 2011 | 1995 Ford Explorer

2 Answers

My car keeps dying out, could it be the battery or alternator?


unlikely, if it starts the battery is good because it just started the car and the alternator is good because it charged the battery the prior time it was running. i would put some thought into a fuel supply problem, such as the pressure falling off rapidly after a start; or something getting hot in the ignition systrem and failing causing a loss of spark.

Jul 25, 2011 | 1993 Ford Probe

1 Answer

My 2005 ford explorer check charging system warning light


if charging light is on w/ engine running,the fault could be the alternator or another component of the charging system.remove, clean and tighten battery post connections to check for alternator output,use a volt meter or multi-tester set to 50 Volts DC,w/ tester on battery terminals it should read 12 volts W/ engine off;13 to 14 volts w/engine running.if voltage increases when alternator is spinning,suspect battery

Sep 28, 2009 | 2002 Ford Explorer

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