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Discussion Starter #1
As usual, not covered in searched threads . . .

Batteries brand new 3 months, holding 12.6 after sitting.
Old alternator died. Replaced with Duralast.
Ford Gauge and Edge Insight CTS2 show charging at 13.6 - 13.8.

PCM was cleared.

Alternator tested by Autozone and shows good.

Batt light did not come on with the old alternator until it died.

Multimeter backs-up what the gauges say. Anyone?
 

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I believe the middle wire is the charge indicator wire, maybe it's broke, or the new alternator is not supplying power to it
 

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I'll post trouble shoot pictures and wire tomorrow. These are called 1 wire, but are really 3 wire

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I believe the middle wire is the charge indicator wire, maybe it's broke, or the new alternator is not supplying power to it
^^^^^what that feller from north caroliner said.^^^^^
 

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That's the key on wire. Charge is white.

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Idk. I'll look it up.used to be green/red tracer wire is key

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,.....


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Discussion Starter #8
I believe the middle wire is the charge indicator wire, maybe it's broke, or the new alternator is not supplying power to it
I'll post trouble shoot pictures and wire tomorrow. These are called 1 wire, but are really 3 wire
Sent from my SM-N960U using Tapatalk
That's the key on wire. Charge is white.
Sent from my SM-N960U using Tapatalk
Idk. I'll look it up.used to be green/red tracer wire is key
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Ummmm The wire harness has only two wires to the generator plug - "1" and "3". There is no center wire . . .

AND I have misplaced my schematic book. Dang it.
 

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Discussion Starter #9
Found this, but on a Ranger. Is that "wht/blk" wire something that should be internal?

201859
 

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Discussion Starter #10
This is what I have. There is no terminal in the (D) Dummy socket.

201860
 

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Discussion Starter #11
This page has a picture of the alternator system. It shows only the two wires, plus the black/orange power wire.

 

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Then it would be the lamp ignition wire, is the fuse good. Is there 14ish volts present while running?
 
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Are you sure that the alternator is charging the batteries?

The alternator gets it's exciter voltage from the wire from the light on the dash. Without this voltage the alternator will not begin to charge.

I went through this with another member either here or on TDS and he finally found a broken wire, but he was not charging and it was on a OBS truck so the diagram that I am posting here may not have the correct wire colors for a Super Duty but you may get the idea since the alternators are the same.
 

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Discussion Starter #14
Yes, it is charging the batteries, as per Autozone test, as well as my multimeter, and the CTS2 gauge.

Actually, going by memory, the wires are the same colors.
 

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Are you sure that the alternator is charging the batteries?

The alternator gets it's exciter voltage from the wire from the light on the dash. Without this voltage the alternator will not begin to charge.

I went through this with another member either here or on TDS and he finally found a broken wire, but he was not charging and it was on a OBS truck so the diagram that I am posting here may not have the correct wire colors for a Super Duty but you may get the idea since the alternators are the same.
Thanks for that. My 94 is sort of charging. Guage in dash not working battery light sometimes on. Been a nightmare to figure out

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Discussion Starter #16
Well, I had noted that the alternator charging rate was fluctuating, and had gotten as high as 14.6v. I swapped it out at Autozone.

Damned idiot light is still on. I don't get it. Grrrrrr

Dash charging meter shows it dead center, and the CTS2 shows it charging 13.8. This is so annoying.
 

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Discussion Starter #17
Then it would be the lamp ignition wire, is the fuse good. Is there 14ish volts present while running?
Yes . . . the CTS2 and the dash gauge agree.
 

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It's almost like there is a wire pulled out of a connection. You were playing with the ignition wires trying to get your truck to start. Is it possible one of those wires is also for the battery light?
 

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Having the same trouble with my 94 doc, and I replaced all those. I'm thinking circuit board problem on the back of the gauges.

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Discussion Starter #20
How is it a simple alternator swap could do that?

It worked fine.

The alternator failed.

New alternator in and working. Light doesn't go out.

You'd think there is some code to be cleared, but . . .
 
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