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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 05-14-2008, 12:01 AM   #1
NeedStangSpeed
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Default Charging system diagram/ question

Ok, I'm having a charging problem with an 03 GT, and somebody suggested this:
that on the alternator plug there are 2 wires, one goes to the guage, the other goes to some relay?? that lets the regulator know that charge is needed and to activate. I've already changed the alternator, have had the system tested, they say it's not the battery, and says the test shows there was a short. So I guess after this little run down of progress up to this point, I'm wondering if anybody know where this "relay" is, I already checked the fuses, or has a diagram better than what the chilton comes with. Anybody?
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Old 05-14-2008, 07:50 PM   #2
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Default RE: Charging system diagram/ question

bump... anyone got this one?
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Old 05-15-2008, 10:41 AM   #3
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Default RE: Charging system diagram/ question

I saw in another post that you may have resolved this, however here's the charging system diagram...
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Old 05-15-2008, 12:00 PM   #4
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Default RE: Charging system diagram/ question

Thanks I appricate it, but I'm still digging into this. I found the solid yellow wire with white stripe on this diagram, and I'm trying to figure out if that wire goes to anything else, or is it just cut plain and simple like this:

alternator, to fuse, to + power source?

Just making sure before I bridge it. all I see on it is a fuse. I want to make sure nothing controls the current going to it. Or is it as simple as bridging a wire from + terminal of battery to that plug and seeing if it works? The fuse is still good, so this is losing me.


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Old 05-15-2008, 12:12 PM   #5
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Default RE: Charging system diagram/ question

It is as simple as you stated--the yellow/white (it's marked YE/WH) wire runs from terminal 3 on the alternator through a 30A fuse, to the battery junction box, to the battery + terminal through the fusible links.[/align][/align]As a poster said in the other thread, it provides battery voltage feedback to the voltage regulator (inside the alternator, which is more correctly a generator as Ford labels it--since itdelivers DC output). This let's the regulator do it's thing. I would not get rid of the fuse, Ford spent money putting it there because it was needed.[/align][/align][/align]
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Old 05-15-2008, 02:32 PM   #6
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Default RE: Charging system diagram/ question

Oh, I wasn't planning on getting rid of the fuse, I just wanted to make sure there was a good connection, and there is, but for some odd reason, still not charging. Back to the drawing board, time to test the alternator again.
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Old 07-28-2014, 10:13 PM   #7
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Lightbulb charging problem on 2000 gt mustang

I replaced the alternator, and its still has a drain, my battery light has remained on, I have no power to drive it just sucks thelife right outta my battrey, is there a charging relay under my hood in my fuse box, something that is keeping my car from charging correctly?? i really need help on this cuz ive gotta fix it I have nobody else to help me.. so here i am counting on someone who knows whats up it just started draining my battery when i left yesterday and turned on my lights, i replaced alternator today and its not fixed, watched it charge then slowly loose its charge. and my car died..Help please
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Old 07-28-2014, 10:13 PM
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