I have a wire that has broke, 1979 F150 351M


It comes from the Alternator Bat Terminal, a thick Black w/ Red stripes wire, up by the fender well, it splits in two, ("1" in pic), one of the wires is Yellow, and goes to the Voltage Regulator Terminal "A", ("2" in pic), and then back out to an RF Suppressor, the other split is Black w/Red stripe, it is a "Fusible Link 16 GA" ("3" in pic) which goes to a connector(?) on the fender well. (this is the wire that broke off)


The wire broke at the split, which according to the "1979 Light Truck Shop Manual" page 31-43-3, has a factory weld on the wires. I thought about soldering it back together, but maybe its a weld for heat issues.




I can't find this in any of the parts catalogs I have, and don't know where to find a part number, I doubt I could find one at a junkyard, I'm open for options, and or suggestions, also where could I take the wires to have them re-welded ?

 

What you need is an alternator wiring harness (basic P/N 14305). There are four possibilities depending on whether you have gauges or idiot lights and whether you have a 40/65 amp alternator or the 70 amp version.
Let me know which you have and I'll see if there are any harnesses still available.

 

Thanks for the quick reply Mike, I have a light on the dash, but an aftermarket gauge under the dash, and I don't know how that is wired up. As far as the Alt. how do I tell which one I have ?

 

If you have the 1973/79 Ford 100/500 (Light Truck) Parts Catalog like Mike and I do, you whiz to SECTION 130 INDEX, in the Illustrations, look for the wiring for 1978 (also applies to 1979).

Then when you find the correct illustration (see below), look for the alternator regulator (10316) that the 14305 harness plugs into.

Then whiz to 14305 in the Text Section, and get the part number. Piece of cake!

 

Most likely you have the"regular" small case Motorcraft alternator. The 70 amp version is called the "large case" alternator and takes a different plug.
Here's a comparison of the small and large case alternators.

 

Taking a guess that you have the standard small case alternator, that's the most common one.
Wiring assy, alternator to voltage regulator
Fits: 1979 F100-350 w/ oil & amp warning lights and 40/65 amp Ford alternator.
D9TZ-14305-C

I located 1 NOS
NOS Parts Source
Olathe, KS
(913) 220-5746

Let me know if you have the large case alternator and I'll search for that harness.

 

Number Dummy, I have the "Shop Manual" not the Parts Catalog

Mike, yes that looks like mine, it has 3 terminals, BAT ( wire I described), FLD Yellow wire to VR terminal F), and STA(white black wire, to VR S) I won't swear by the wire colors, they are very dirty

 

Pretty easy to ID, the large case alternator has the terminals on the side, not the back.

 

mine are on the back

 

Yup, you have the small case.

 

where can a guy get that Parts Catalog from?


and do you guys know what that part is called under the Starter Relay on the fender well? the one that the Fusible link bolts onto, and do I really need it

 

That looks like some type of aftermarket terminal strip. Not stock.
The parts catalog is available on CD from hipoparts.com and also on E-bay.
1973/79 Truck Series 100/500 Master Parts and Accessories Catalog.

 

Then could I bypass that and direct wire all that stuff together ?

 

With the new harness, you should be able to restore your wiring to factory original condition. Once that's done, you can look at the individual extra wires, figure out what they're for and, if you keep them, decide how to route them.

 

what would happen if I just ran the BAT Terminal wire to the mounting post without the Fusible Link 16 GA wire ?