The new pictures show that the wiring does not look like colored spaghetti, it looks like colored spa-ghetto.
First photo:
Every wire that connects to the starter solenoid needs a ring terminal crimped on it.
There is no way that wad of stripped wires wrapped around the stud makes constant good electrical contact.
The wires will shift and compress, making resistance, which makes heat, which makes more
resistance and more heat. Crimped or soldered on ring terminals will not compress or shift once the
nut is properly tightened on the stud.
Second photo:
The wire color and stripe are the key to what each wire does. The photo does not make accurate
identification of the stripe or even wire colors possible. You will need to write each wire color and
stripe down along with the size. On the diagram, LT is light and DK is dark. Do not omit that
important part of the wire color description when you write down the wire colors.
Wire size definitions: since the wires don't have a size imprinted on them, this may help. At this point
I am not confident that you can look at a wire and make a judgment as to what gauge it is.
Really big wire = 4 gauge battery cable.
Big wire = 10-12 gauge wire like the black/green wire that is the computer power ground
Medium size wire = 14-16 gauge wire like the red/green wire on the ignition coil.
Small wire = 18-20 gauge wire like the light green/pink wire on the ACT sensor
Use the diagram to find the wire color/stripe and identify what it connects to
86 Mustang 5.0 engine compartment wiring:.
If you lack the ability to read the diagram, or can’t find a connection for a wire, post the wire color/stripe.
I will attempt to help. However, this is only as good as your ability to accurately describe the wire
color/stripe and size. Green/red is not the same as dark green/red.
AutoZone wiring diagrams for 79-88 Mustangs are at
http://www.autozone.com/servlet/UiB..._us/0900823d/80/16/71/3c/0900823d8016713c.jsp
Third photo:
The orange wire gets grounded to the back of the cylinder head, or to one of the lower intake manifold bolts.
Leaving it connected to the top of the intake manifold leaves a very bad impression of your workmanship and intelligence.
Wires that connect to ground or to studs MUST have a ring terminal on them to assure a solid, reliable connection.
Do not strip a wire and wrap it around a stud or bolt and expectit to work properly under heat and vibration.
Solder wires that need to be spliced together and cover the soldered joint with heat shrink.
Do not just twist wires together and tape them. This does not make a reliable connection.
See
http://fordfuelinjection.com/?p=7 for help on how to do it the right way.