Question about 1992 Dodge Ram 250
This is a diesel pick up. No voltage to glow plugs.
Alternator not charging.
Could it be the ECM?
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
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.
Posted on Feb 04, 2010
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
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Posted on Jan 02, 2017
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