Question about Harley Davidson FLHR Road king Motorcycles

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High alternator output voltage

My 06 road king will stop charging after it runs for about a minute or so and the bat. light comes on

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You might have a bad voltage regulator.

Posted on Oct 13, 2013

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Posted on Jan 02, 2017

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SOURCE: charging problem

Hi
As the battery & regulator/rectifier have been replaced, the only other things to check are :-
Continuity from reg/rect red wire to battery & to earth, then check for continuity between each of the 3 yellow wires, all should be the same resistance - if not the stator coils in the alternator are faulty

Ride safe
Bike-Doc
Please mark this as very helpful (if it has been!!)

Posted on May 06, 2010

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My 1988 chrysler new yorker is giving me a reading saying improper voltage what could be causing this? Ive tryd 2 different good batterys in it and i get a few miles down the road the battery light starts...


The warning light comes on if the alternator is not charging the battery. You can run for several miles on just battery voltage.
The alternator output would need to be checked when the warning light is on. Its very seldom a battery problem.

Feb 15, 2014 | Cars & Trucks

1 Answer

Battery light and check engine light come on after about 10 minutes of riding, stays on for about 20 minutes or so then goes off and back on again. I have installed a new battery and it still does it.


check all cables to the battery, alternator and grounds for tightness and clean connections
if you have a multimeter check the output from the alternator to be sure it is putting out about 14 volts
it sounds more like a loose connection then a battery problem

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3 Answers

2003 windstar alternator over charge I try 5 or 6 alternator diferent companie always the same problem go up to 18.80 v help me please


it should notgo over 14 1/2 volts.

Get free DTC codes scan from Autozone. I think you will get DTC code 1246 - System Voltage Malfuction.

The I (indicator) (BAT light) wire activates alternator field circuit.

The heavy B wire circuit sends current to the battery for charing and to run the car.

The S circuit helps control the amount of charge. I suspect yours is not controlling. This car has the PCM (engine computer) help control the output and turn the BAT light on when under or over charging.

SECTION 414-00: Charging System - General Information 2003 Windstar Workshop Manual
DESCRIPTION AND OPERATION Charging System This vehicle is equipped with a powertrain control module (PCM)-controlled "smart charge" charging system. The PCM-controlled charging system is a system whereby the PCM determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. The PCM-controlled charging system is unique in that it has two uni-directional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated. The GEN COM line communicates the desired setpoint from the PCM to the voltage regulator and the GEN MON line communicates the alternator load condition to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
-------------------------------------
  • Charging system malfunction (high or low system voltage)
  • possible causes:
    • A circuit 35 (OG/LB).
    • A circuit fuse link.
    • B+ circuit 36 (YE/WH).
    • B+ circuit fuse links.
    • Generator.
    • PCM
    • GEN-COM circuit 586 (RD/PK).
    • GEN-MON circuit 585 (VT).
    -----------------------------------------------------------------------------------
    Generator The generator (10300) on this vehicle is monitored and controlled by the powertrain control module (PCM). The PCM monitors the voltage regulator and sends a duty cycle command back to the voltage regulator to regulate the amount of field current supplied to the generator. The generator has an internal voltage regulator. The generator and voltage regulator are installed as an assembly.
    --------------------------------------------------
    I'll send wiring diagram tomorrow.

    please rate

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    1 Answer

    How to check charging system on 2004 road king


    To check the charging system on your RK, first you need a fully charged battery and a DVOM (Digital Volt Ohm Meter). To check the entire system, connect the red meter lead to the postitive battery post and the black meter lead to the negative post. Put the meter's function selector switch in DC VOLTS, 50 VOLTS OR GREATER. Start the engine and bring it to a high idle. The meter should read between 14.5 and 15.0 volts. It may take a minute for it to max out depending on how "hot" your battery is.

    To check the alternator output, follow the wires from your voltage regulator to where they plug into the engine case. Unplug the plug and look inside the engine case side. You'll see two metal pins or sockets down in the plug. These are what we are going to check the voltage on. Since the voltage is AC, there is no need to worry about which meter lead goes on which pin. Put the meter's function selector switch in AC VOLTS, 50 VOLTS OR GREATER. Start the engine and bring it to a high idle. Touch one of the meter leads to each pin down inside the plug. Do not let the meter leads touch the case or each other. Your meter should read at least 30 volts.

    If you alternator is putting out at least 30 volts, it's good. If it's putting out at least 30 volts and your voltage at the battery is below 12.5 volts, the regulator is bad.

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    Have you checked with HD to see if yours is part of the Fuel Pump recall?

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    If the light is on and the alternator is good then you either have a short to ground in the wire that runs the charge light or there is a diode in the alternator that is bad.The alternator will test good with a bad diode if it is only tested for the voltage it reaches but if you were to check the amperage output it would be down from it's output rating.

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    I'm driving down the road and my truck dies, i'll jump start it and it goes for a couple of blocks and dies again. i've had the alternator and battery checked and they say they're both ok. any suggestions


    It could be that you are loosing a connection to main power on fuse panel but it is unlikely. In most cases if this is happening it is because the alternator is not charging. I know you will say you have had it tested but most testing procedures do not load test the alternator and does not show the amperage output of an alternator, they show voltage. In most cases there is not enough to back up the rate of charge and run the car so it dies again...

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    1 Answer

    I have a 3 wire alternator i need to wire


    Assuming you have an external voltage regulator:-

    The largest stud/nut terminal is B+,
    this is the charge current output, it connects to battery positive (uses heavy high current capacity cable),

    the other terminals are normally spade terminals :-
    DF exciter winding control, (controlled by ext voltage regulator);

    IND (or D+) - via dashboard 'BAT' indicator light, then to +12V when Ignition switch is 'ON' (alternator excitation current source).


    If you have an alternator with an integral internal voltage regulator,
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    and IND (or D+) terminals are present.

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    2001 vw alternator on the fritz


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