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2004 Dodge 2500 pickup 5.7 charging light stays on
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John Anderson
New User
Feb 2, 2015, 8:34 AM
Post #1 of 6
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2004 Dodge 2500 pickup 5.7 charging light stays on
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Charging indicator light is on. Just replaced the battery, starter and alternator. (idiot light stays on). A friend told me there may be some computer module that has failed and I may toast the battery and alternator again. Thanks in advance for any feedback. John
(This post was edited by John Anderson on Feb 2, 2015, 8:36 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 2, 2015, 8:43 AM
Post #2 of 6
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Re: 2004 Dodge 2500 pickup 5.7 charging light stays on
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Does dash have or you have a plain voltmeter? Take voltage while running and find it's probably low. Many Mopars use ECM as the voltage regulator not inside alternator.
You don't really risk your new battery unless you charge it up with a charger now and test it for at least voltage when running.
Try to avoid just tossing everything like it appears it probably didn't need battery or starter right away if at all and might NOT be the alternator itself either,
T
T
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John Anderson
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Feb 2, 2015, 11:53 AM
Post #3 of 6
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Re: 2004 Dodge 2500 pickup 5.7 charging light stays on
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Thanks for responding. Dash has diagram that displayed battery was charging while the separate "idiot Light" is on contradicting the other gauge. Battery (less than two years old was deemed toasted and I replaced it). The garage where I towed it, replaced the alternator and said it was toast along with the battery. I snapped the bolt on the starter and replaced it when I tried to clean the connection. My fear is toasting the battery and the alternator again because the warning light stayed lit.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Feb 2, 2015, 12:41 PM
Post #4 of 6
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Re: 2004 Dodge 2500 pickup 5.7 charging light stays on
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! Yes, a battery can overwork an alternator if too low or bad and how old isn't the issue it is just stinks. What happened to begin with? It's cold - dang cold where we are - I'm in MA not far away. Know that if somehow you let that battery go dead for any reason - a light left on it died and froze which can easily short it inside.
Check that everything is plugged in and no visible overheating of wires or plugs at alternator for now. You need a voltmeter with real #s not the gauge now most are general areas not a specific # so well.
What happened at the starter that you went there at all? Did you short out a tool while breaking off a bolt/stud there?
#1 is it will be way too cold again tonight here so you have to charge that battery somehow hopefully you have a charger or can get one.
Already said voltage regulator is almost certainly NOT in the alternator like many and can fry the controlling computer that does that. A "check gauges" warning or a battery icon (don't know what dash displays everything has) still on right now hopefully is just saying charge when running is still only a bit too low or even too high - never saw that on this type.
Kinda seems like there was a rush to blaming everything all at once on this so at least check the wiring that was touched, messed with and eyelet at starter that things are looking right at least,
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Feb 2, 2015, 1:56 PM
Post #5 of 6
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Re: 2004 Dodge 2500 pickup 5.7 charging light stays on
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You'll need to take it into a shop that has a high end scan tool that can access the manufacture's side of the PCM to see if there are any charging system related codes stored. Code may give clues on which direction to take to troubleshoot it. The voltage regulator is built into the PCM, but that doesn't necessary mean the PCM is at fault. Circuit checks should be performed instead of just tossing parts at it.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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John Anderson
New User
Feb 2, 2015, 2:54 PM
Post #6 of 6
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Re: 2004 Dodge 2500 pickup 5.7 charging light stays on
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Sounds like a plan. Thanks. I will post results.
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