Making final connections/checking wiring before start up of rebuild.
Was re-wrapping the bundle of wires to the alternator and at the alternator end as the tape un-wrapped a loose yellow wire was exposed. Looks like it broke off but I could not see another pc of wire or evidence that it went anywhere. There is a second yellow that goes back to the starter relay which is larger. The dead end yellow is smaller.
Any ideas? Can I just re-bury it? Here's the photo
"O say, does that star spangled banner yet wave? Oer the land of the free and the home of the brave?" It does at my house! God bless America!
1) Battery to ignition switch feed
2) Alternator output to voltage regulator
3) Turn signal switch to left/rear tail-lamp
4) Battery to horn switch
5) Alternator output "A" terminal to ammeter load terminal
Considering where you found this wire, I'd say it's safe to rule out #3. Sounds to me like #2 (or #5, if your truck has an ammeter gauge).
____| \__
-O-----O- Keith
'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special My '67 restoration video -> Posting and you!<-a MUST watch for all!!
Well, it looks like you were right Keith...as far as I can tell. The smaller yellow wire goes from the starter relay down to a large black connector. Past the connector it has an in line fuse and then is broken off.
I can not find any continuation of this wire past the in line fuse. There is another unused post on the back of the alternator would this be the "A" post you mentioned?
The wiring diagrams don't seem to match this particular run of wires.
If this is the ignition yellow (the one under the dash seems much thicker)
where would it terminate?
Thanks
"O say, does that star spangled banner yet wave? Oer the land of the free and the home of the brave?" It does at my house! God bless America!
Actually, from what you described, the "large black connector", sounds like the shunt that is used to power the ammeter.
There is a large-diamter wire that runs from the starter solenoid to the alternator. Trucks with an ammeter had a shunt in that wire, with the two wires powering the ammeter coming from that wire. Does the "large black connector" look like this? If so, that's the shunt:
I was researching the use of the shunt a while back, so it's been discussed several times. Do a search here for "shunt" and read those threads, it might shed some light on it.
____| \__
-O-----O- Keith
'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special My '67 restoration video -> Posting and you!<-a MUST watch for all!!
Well, when I un wrapped it, the yellow wire did terminate at the shunt, but did not appear to go into it.
The connector I was referring to is shown on the wiring schematic you posted for 69's. It's in one of the photos above in foreground with the in line fuse coming out of it.
Should I dig into the shunt to try to find the connection for the yellow wire?
Thanks for the help, I no squat about electrical stuff-just don't want any troubles when I fire up the motor for the first time.
Tom
"O say, does that star spangled banner yet wave? Oer the land of the free and the home of the brave?" It does at my house! God bless America!
In that photo you posted up above, it looks like a wire is missing from the shunt, compared to Keiths photo of the same thing (from a different angle).
The two smaller yellow wires come out of the shunt right next to each other.
i'll try to look at some of the wiring i have laying around and try to figure it out for you. i have a similare fuse like that but my wire is red. i think mine is a unused circut for camper special lights. mine is a 68 though.
The yellow I'm asking about does have an in line fuse going down to the "shunt" (rubber plug thingy going to the alt). It sounds like with the fuse in place I can just solder an end on and hook it up to the alt. BAT post (just have to find out which one that is). If anyone feels like checking my interpretation, let me know if that sounds right.
Thanks.
"O say, does that star spangled banner yet wave? Oer the land of the free and the home of the brave?" It does at my house! God bless America!
do your guages have a ammeter in them? i looked at my harness but it is so greasy i cant tell one color from another. plus its all nice and wrapped up tightly.
69rangerman wrote:
The wiring diagrams don't seem to match this particular run of wires.
If this is the ignition yellow (the one under the dash seems much thicker)
where would it terminate?
Thanks
That fuse is the A side of the Ammeter. The Ammeter takes two fuses on the A side and the other on the B+ side. The other one is up by the starter solenoid.
I would show you the wires and my solution to the fuses but I have a problem.
That is over 2 feet of snow on the truck from the last 2 days. Since Snaggletooth is down it is no big deal. Any way my holders were shot so I put in sealing type ATM fuse holders.
So does the smaller yellow on the battery side of the solenoid go straight the bat terminal on the alternator?
Sorry but I just don't understand how to search this stuff out. Best I can do is tell you that with a self powered circuit tester there is current from where it goes into the firewall all the way down to the end of the wire.
"O say, does that star spangled banner yet wave? Oer the land of the free and the home of the brave?" It does at my house! God bless America!
The smallerYellow tied into that spice (it's not a shunt a shunt is not used in these years. That is why the fuse to keep full battery current from dumping to ground.) and on mine it was pulled free. So I cut into the splice rubber housing and found where the yellow wire had been torn loose. I repaired it there and at the same time added the ATM fuse holders on the yellow wire #654 spliced with #38 Black,#37 Black/Yellow,#152 Yellow and the red wire. #655 was changed to the ATM fuse type at the same time.
kid wrote:...(it's not a shunt a shunt is not used in these years...
HUH?? kid, that picture above were taken of the shunt in a '68 F100 wiring harness. In fact, both trucks with full instrumentation that I've recently parted out (a '67 and a '71) used a shunt, neither of them had a fuse setup. I still have the harnesses.
I have to admit, though...I've wondered why the factory wiring diagram shows a fuse when I've never seen one, and why they never show a shunt when that's all I've ever seen.
____| \__
-O-----O- Keith
'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special My '67 restoration video -> Posting and you!<-a MUST watch for all!!
A shunt is a resistor strip that drops a minimum of volts so an ammeter (which is really a voltmeter anyway) can read. In my 69 the shunt is in the gauge.
I took my dad's wiring harness from his 69 F100 LWB when he sold it for his 79 LWB and moved it into my ratty 68SWB the harnesses were identical since we both had full guages.
My 69 has the whole rubber piece removed and moved onto an insulated terminal standoff using ring terminals on each of the five wires and my Ammeter and my alternator work fine.
That is why I so badly wanted to take a picture of under the hood at what I did.
See pic of what a standoff looks like.
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kid, that picture above were taken of the shunt in a '68 F100 wiring harness. In fact, both trucks with full instrumentation that I've recently parted out (a '67 and a '71) used a shunt, neither of them had a fuse setup. I still have the harnesses.