Question about 1985 Ford F150

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Where do the wires go on back of alternater. ibought a neew voltage regulater d a new alternator now the battery wont charge

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Color codes are shown in the diagram. The terminals should be marked F (field), S (stator), and B (battery) on the alternator. The ECM provides the stator current. Please let me know if you have more questions. where do the wires go on back of alternater. - jturcotte_110.gif

Posted on Nov 08, 2010

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Posted on Jan 02, 2017

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I bought a new alternater and battery the alternater isnt charging the battery what else could be wrong


You have to check for B+ voltage at the heavier gage wire on the back of the alternator , could have a blown fusible link , plus the smaller gage wires at the connector that plug into the alternator mite have B+ voltage as well . You could look at a wiring diagram , that would show you . http://www.bbbind.com/free_tsb.html .Plus watch Test and troubleshoot your charging system Battery alternator testing

Jan 11, 2017 | Cars & Trucks

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Alternater wont charge battery and fusable link on starter keeps burning


Bad voltage regulator. Usually built-into alternator.
Start car and unplug battery, if it dies your alternator is dead. Get new alternator. If car keeps running, get a voltmeter and check voltage coming through - should be higher than 12v but less than 18v. Any other number means your voltage regulator is dead, cheaper to get a new alternator.

Jan 11, 2013 | 2000 Dodge Neon

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New alternater still not charging


The car is having power drained somewhere. Check for an electrical short or some kind of "on" power source. Good Luck!!-----------------------------------------------------------------------------------
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Dec 17, 2012 | 1999 Chevrolet Venture

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Charging system


Start your engine and take digatal multimeter and ground the black probe and put the red one on the back on the alternators large red wire and read the voltage it should between 13-15 volts anything more or less then you will need to replace the alternator.

Feb 03, 2012 | Cars & Trucks

2 Answers

There is a ground some were that is causeing the battery not to charge put new selinoid ,new battery,alternater,new key lock cylender check wirers fuses relay switches and battery still wont charge


It sounds like you have done a whole lot of replacing and not much "diagnosing". Did you chech for battery voltage at the alternator? There should be battey voltage at the large Black/Orange wire that is on the B+ terminal of the alternator. This wire should have voltage all the time. If there is no battery voltage, you most likely have a burned fusible link at the starter relay area.
There should also be voltage at the "S" terminal with the ignition on. If there is no voltage, then check for voltage at the "S" terminal of the voltage regulator. If there is no voltage at the "S" terminal on the voltage regulator then check the "I" terminal on the regulator for voltage.

NOTE: The voltage on the "S" terminal should be 1/2 that of the voltage on the "I" terminal.

If there is voltage on the "I" terminal, make sure your voltage regulator is grounded properly to the fender and retest to see if it is charging the battery. If it is still not charging, disconnect the regulator connector and connect a jumper between the "A" and "F" terminals of the connector. Start the engine. The alternator should now be charging the battery at high voltage (usually over 15 volts) If it does, replace your voltage regulator. If it does not, then you need to check your wiring between the voltage regulator and the alternator.

Please also review this article:

What Else Could Be Wrong?

Jun 15, 2011 | 1987 Ford F 150

1 Answer

My jeep will run all day long untill i run my headlights or use winsheild wipers but i put new battery and alternater and voltage regulater .but soon as i turn any thing on my jeep will run for a little...


Check the alternator drive belt adjustment 2- Check battery terminals for corrotion or loose.3- loose,broken or faulty wiring in the charging system. 4- short in the vehicle wiring cause continuous drain of charge., sammyc47

Feb 24, 2011 | 1995 Jeep Cherokee

1 Answer

Battery is only chargeing intermittently I think. Both lights and battery warning dashboard warnings come on, and stay on when I start the car. I believe the lights icon is only to alert you to a failed...


You need to measure the charging voltage and current using a multimeter while Rev'ing the engine. If there is no clean flow to the battery then you need to start from the alternator, the output ac and the charging regulator section which rectifies and controls the charging. The alternator can be taken out and checked individually , if there is a steady AC flow. Check the battery ground and also the charging regulator which is usually an extra unit- trace the lines of the alternator to this unit.
Please find some tips below .


http://www.fixya.com/cars/r5824824-draining_car_battery_charge

Feb 21, 2011 | 1991 Toyota Camry

1 Answer

Not charging


First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

Sep 23, 2009 | 1986 Chrysler LeBaron

1 Answer

Alternator wont charge the battery put a new one on still wont


When replacing Alternator on This Vehicle Voltage Regulater Must Be Replaced Also.

Jun 02, 2009 | 1990 Chrysler New Yorker

1 Answer

F250 NEED HELP!!!


The only thing I could suggest is that if you bought a remanufactured alternater you may have gotten a bad one. It tends to be hit or miss with any remanufactured part.

Oct 31, 2008 | 1987 Ford F 250

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