Question about 1992 Dodge Ram 250

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This is a diesel pick up.\r\nNo voltage to glow

This is a diesel pick up. No voltage to glow plugs.
Alternator not charging.
Could it be the ECM?

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  • obecinc Feb 04, 2010

    ftw, thank you. Are the diodes internal. Also, no voltage to glow plugs. And where can I get a copy

    of the wiring.

  • obecinc Feb 04, 2010

    1992 Dodge Ram 250 Pick up truck.
    There is no voltage to the glow plugs.
    How can I test the ECM?
    Where can I get a wiring schematic?

  • obecinc Feb 04, 2010

    Hi Z,



    Where is the voltage regulator located on a 1992 Dodge Ram 250 Diesel Pick Up?

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2 Answers

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  • Dodge Master
  • 17,970 Answers

Some people tell you that you can check your alternator by disconnecting it from the battery to see if the alternator can produce enough current to keep the engine running. BAD IDEA! Disconnecting the battery will subject the voltage regulator (and computer and audio equipment...) to significant voltage spikes which may cause an otherwise good alternator to fail. Even if there were no damaging spikes, this test would not indicate whether or not the alternator was good because the engine will easily run with a weak or failing alternator.

Simple Test:
If you want to see if your alternator is producing current, turn on your headlights when you're parked and the engine idling with the headlights shining on a wall (at night). Notice how bright they are. Then turn the engine off. The lights should get dimmer when you turn the engine off. If the lights get brighter when you kill the engine, the alternator was not charging sufficiently. When doing this test, the lights should be the only load (turn the stereo, a/c and other accessories off). With a heavy load, an otherwise good alternator may not be able to produce sufficient amounts of current at idle.

Also I suggest check this article about Glow Plug.

Hope helps.




Posted on Feb 04, 2010

  • ZJ Limited
    ZJ Limited Feb 04, 2010

    Chrysler Full-Size Trucks 1989-1996 Repair Guide

    Regulator -REMOVAL & INSTALLATION
    (see Figure 1)


    This procedure covers diesel models only.


    On ALL gasoline models there is no separate voltage regulator.
    The regulator circuitry is contained in the engine controller. If this
    circuitry is found faulty, the entire engine controller computer must
    be replaced as a unit.









    Fig. 1: Pull on the connector body, not the wiring when removing the electronic voltage regulator






    1. Disconnect the negative battery cable.


    2. Release the spring clips and pull off the regulator wiring plug.


    3. See if your bolts are rusty or hard to remove, if so use lubricant and allow to sit for a few minutes before removing.


    4. Remove the regulator.



    To install:



    1. Install the regulator and secure using the hold-down bolts.


    2. Hook the spring clips to the wiring plug. Make sure the clips are fully engaged.


    3. Connect the negative battery cable.

    For the schematic wiring, can check this...

    Engine wiring-1992 3.9L/5.2L Dakota, Ramcharger and Pick-up



    E
    ngine wiring-1992 5.9L gasoline engine Ramcharger and Pick-up



    Chassis wiring-1992


    Hope thats help.






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  • Master
  • 10,319 Answers

If you start with you altenator this is probably your problem. Take a volt meter and connect the prbes to the battery. Set the volt meter to the DC setting. If you leave it in the AC setting you will detroy the meter for this test. Have the engine running and see what the battery is putting out for voltage. If under 13.5 volts the regulator is bad. Now reverse the probes to red on black and black on red. If you receive a reading of voltage on this meter this will tell you the diode is bad.
A diode keeps voltage running ONE way only for a DC current. If it reverses no charge will be sent to the battery

Posted on Feb 04, 2010

  • frank thomas wilson
    frank thomas wilson Feb 04, 2010

    ECM will read the altenator's output only

  • frank thomas wilson
    frank thomas wilson Feb 04, 2010

    The glog plugs run off a controller. Check the output to that as well. Wiring diagrams are found at any local library of service manuals & also found at Auto Zone

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