A fusible link? There is one back there. If thats what youre referring to thats the power feed for the ignition switch to the coil. Should that, or any other fusible link blow (there are a few), whatever is on that circuit will no longer work.

Fuse link A = black 16 gauge
Fuse link B = black 16 gauge
Fuse link C = black 16 gauge
Fuse link D = brown 18 gauge
Fuse link E = brown 18 gauge
Fuse link F = green 14 gauge
Fuse link G = dk blue 20 gauge
Fuse link N = dk blue 20 gauge
Fuse link K = dk blue 20 gauge

Fuse link K is not pictured as that is on the passenger side. That one is for the O2 sensors, near the hood hinge where the main harness passes thru the firewall. Links A thru C are for the accessories. Links D thru N pertain to the starting and charging systems, as well as the fuel injection circuits.

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

 

The resistor in line with pin 4 of the EEC is a resistance wire, it is not a lumped component resistor. The wire from 4 is a low resistance wire (just a few ohms) that serves as a ballast resistor for the ignition coil.

If you really have a little 22k resistor it probably would be red, red, orange with a tolerance band or space of blank, gold, or silver. What does that resistor look like? Does it have a free end hanging in space, or where does it connect?

 

If you look at the first diagram fb posted,there is a 22k ohm resistor in that picture right above the fusible link N to the windshield washer motor.Its just a wire with a grey plastic piece inline with the wiring harness,which I assume is the resistor itself.FB thought I was referring to the fusible links,but I already know what they're for.You mentioned the right part.

 

Ok, that thing. Thats an ignition supressor resistor. Noise supression basically. RF intereference from the radio. It runs from PIN 4 of the computer to the coil and TFI. Its in the second pic. The 94-up models have one as well. I think two, one per coil. Same purpose.

Want to have some fun? Put your head unit on AM as you drive. The supressor lets the static through and you can follow the engine revs thru your speakers lol. Atleast with mine i can.

As for that other wire with shielding over it, thats an ignition shield. Another RF supressor of sorts. I think. :headscratcher:

 

So if I start hearing that noise coming out of the speakers,that resistor is probably bad.Eventhough 1 resistor wire isn't all too complicated,it amazes me when I look at a electrical schematic or diagram and wonder how somebody designed it.I can figure things out when 1 wire goes from point A to B in a straight path,but when this wire splices into another wire and it attaches to 5 different switches with fusible links,etc I start getting confused.LOL.That's why I ask questions like this.The engine harnesses are one thing but I wouldn't even attempt to dive into the dash wiring.Enough of my rambling,thanks to fb and old man for the info and lesson.