Some wires and vaccum lines?

the vacuum line with the solenoid on it is for the charcoal canister, the electrical plug should be on the passenger side by the coolant sensor somewhere. And the last one in the hole by the firewall I want to say is for the cruise control but i'm not 100 percent on that.

In your first pic the blue and the brown go to the battery post on the solenoid.

In your second pic the 2 blacks are screwed with a hex head screw to the inner fender right behind the battery.

In the third pic that assembly goes to the charcoal canister located at the front bottom of the engine bay on the passenger side. You are better off putting that back in. One end attaches to the canister and the other end goes to the underside of the front of the upper intake.

In the fourth pic that goes to the plastic vacuum manifold that is bolted to the firewall. It specifically goes to the fitting marked "S/C".

Some more diagrams h & helpful tech notes...

Starter solenoid wiring 86-91 5.0 Mustangs with standard starter






Starter solenoid wiring 92-93 Model cars and earlier models with high torque mini starter.




Grounds are important to any electrical system, and especially to
computer controlled engines. In an automobile, the ground is
the return path for power to get back to the alternator and battery.

1.) The main power ground is from engine block to battery: it is
the power ground for the starter & alternator.

2.) The secondary power ground is between the back of the
intake manifold and the driver's side firewall. It is often missing or
loose. It supplies ground for the alternator, A/C compressor
clutch and other electrical accessories such as the gauges.
Any car that has a 3G or high output current alternator needs
a 4 gauge ground wire running from the block to the chassis
ground where the battery pigtail ground connects.
The 3G has a 130 amp capacity, so you wire the power side
with 4 gauge wire. It stands to reason that the ground side
handles just a much current, so it needs to be 4 gauge too.

The picture shows the common ground point for the battery & extra 3G
alternator ground wire as described above in paragraph 2. A screwdriver
points to the bolt that is the common ground point.
The battery common ground is a 10 gauge pigtail with the computer ground
attached to it.

Picture courtesy timewarped1972


Correct negative battery ground cable.


3.) The computer has its own dedicated power ground that comes off the ground pigtail
on the battery ground wire. Due to it's proximity to the battery, it may become
corroded by acid fumes from the battery.
In 86-90 model cars, it is a black cylinder about 2 1/2" long by 1" diameter with a black/lt green wire.
In 91-95 model cars it is a black cylinder about 2 1/2" long by 1" diameter with a black/white wire.
You'll find it up next to the starter solenoid where the wire goes into the wiring harness.


4.) All the sensors have a common separate ground. This
includes the TPS, ACT, EGE, BAP, & VSS sensors.

5.) The O2 sensor heaters have their own ground (HEGO ground)
coming from the computer. This is different and separate from
the O2 sensor ground. It is an orange wire with a ring terminal
on it. It is located in the fuel injector wiring harness and comes out
under the throttle body. It gets connected to a manifold or bolt on
back of the cylinder head.

6.) The TFI module has 2 grounds: one for the foil shield around
the wires and another for the module itself. The TFI module
ground terminates inside the computer.

7.) The computer takes the shield ground for the TFI module and
runs it from pin 20 to the chassis near the computer.

8.) The computer's main power ground (the one that comes from
the battery ground wire) uses pins 40 & 60 for all the things it
controls internally.

See Automotive Test Tools for help for help troubleshooting voltage drops across connections and components. .



Extra grounds are like the reserve parachute for a sky diver.
If the main one fails, there is always your reserve.

The best plan is to have all the grounds meet at one central spot
and connect together there. That eliminates any voltage drops
from grounds connected at different places. A voltage drop
between the computer ground and the alternator power ground will effectively
reduce the voltage available to the computer by the amount of the drop.

If your speed density it should just plug to the upper plenum somewhere. If you are Maf it don't have a vacuum line, just a plastic cap looking thing on the spot that would have a vacuum line