Question about 1985 Dodge Ramcharger

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Charging system is not charging. Battery and alternator good. Any ideas?

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  • jaap schildmeijer May 11, 2010

    voltage regulator built inn or external

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Check the wires for corrotion at the terminals, especcially the ground wire is prone for problems with corrotion, check on both the alternator and the battery and where they connects to the chassis, also check the wires for other defects

Posted on Feb 08, 2010

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I start my 2009 dodge truck 6.7 up and it said call dealer and the volts drop

Posted on Oct 25, 2012

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99 Dodge Ram 3500, Alternator is good but batteries are not charging.

Posted on Apr 19, 2010

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  • Master
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On the fire wall there is a silver looking box that's your voltage regulator, more then likely bad, replace it.

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

freetek
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SOURCE: 2002 sonata 2.4l battery dash light on. replaced alternator. Still not charging

I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it. The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator. The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.     Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only. This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.

Posted on Oct 03, 2008

  • 9 Answers

SOURCE: 1988 chevy suburban charging system

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

Posted on Jan 07, 2009

  • 114 Answers

SOURCE: 1996 dodge ram 2500 van alternator not charging battery

do a continuity test from the large red wire on your alt to the battery,could be a fusible link or broken wire,sometimes a wire will break within the sheathing so it won't be visible by eye,check all conections for corrosion and either clean or repair

Posted on Feb 21, 2009

  • 117 Answers

SOURCE: Alternator & battery test good...alternator is not charging bat.

you might check the fuses and battery cables

Posted on Jul 03, 2009

  • 56 Answers

SOURCE: 2005 ford f350 diesel charging system

take the termanals off and look inside them. Use coke to clean them.

Posted on Jul 21, 2009

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Are you aware that this charging system is computer controlled ? There is also a temp sensor for the battery > Battery Thermistor
In addition to the voltage regulator the charging system also utilizes a battery thermistor, which measures battery temperature, in order to control system voltage. A procedure for replacement of the battery thermistor can be found in this section.

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Are you using quality alternator? Is this rebuilt or new alternator? Make sure the battery has a full charge, don't charge a dead battery with alternator. Check the alternator belt tension. Check wiring circuits for battery and charging system. Check for excessive battery amp draw, with everything off.

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Already replaced new battery, new alternator, fuse, and pt connector - voltage sits at 12.9 running - system still not charging?


It isn't a good idea to disconnect the battery while it is running as the resulting voltage surge can damage electronics. Obviously if it isn't charging there won't be much of a surge...

Some alternators are mounted in rubber to cut noise and vibration. This type needs a ground wire which is sometimes forgotten during replacement and sometimes the ground wire just breaks.

A standard alternator only needs two or three wires and sometimes a ground wire. If the direct connection to the battery is good, the ignition light wire intact and working and if needed a battery sensing wire (though this wire isn't often needed in the last couple of decades) the alternator, if it is any good, will charge the battery at the regulated voltage of about 14.5.
If you are sure the alternator is a good one and it isn't charging the connecting wires must be at fault and need to be checked.

There is one other possibility and that applies only in the case of smart charging systems. If your car has a smart charging system the alternator will have several extra wires, usually plugged into the side of the machine.
The alternator works in a similar way to the standard unit except instruction from a separate control unit is capable of reducing or suspending charging. The smart charge black box talks with the engine management black box and charging is suspended during acceleration to cut fuel consumption or improve acceleration. A fault in the smart charge system can prevent the alternator charging.

Disconnecting the additional wiring will allow the alternator to perform its normal function without interruption. The ignition, charge or battery light is controlled by the black box and can do strange things that mean nothing when the smart charge is disconnected.

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