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Wiring
Wiring was fairly straight foward. From 83-86 the car used a Feed Back
carb with a computer to control ignition and modify the carb a little.
Basically you would need to pull the harness for this computer out and
toss it as far as possible. Or save it for other purposes. Don't cut
anything you don't need to or you may regret it. Only unplug what is
required to get the harness out.
For the body part of the car you'll need to find the coil power feed(which there is a
spare one on the driver's side of the engine bay you can tap into),
which should be a red/green wire. If you are unsure you can use a
Digital Volt Meter with ohms tester to check if the wire is the same as
the one coming from the coil. Next you'll need to find a tach signal lead which should be
green/yellow. These two wires are the most important as they are
required to make the car run. The tach
signal will connect to the harnesse's tach signal(in my case the same
color). Coil power will connect to the
EEC Relay's coil to trigger the power to the EEC.
For the harness side you'll need a wiring diagrham. It is best to
source a service manual for a good diaghram and sometimes you can get
these from your local libary. Here is a link to a site that has some
wiring diaghrams as well: http://gt350r.stangnet.com/
The harness you use will determine what type of wiring you will need to
do. I chose to use a 87/88 Turbocoupe harness to avoid repinning for
the computer I wanted to use(an LA3). This harness has more connectors
but isn't as complex as some say it is. As long as you have the engine only harness it won't be a
problem. The other alternatives are the 87-89 2.3 Mustang harness and
the Merkur Harness as well as the 83-86 Turbocoupe and XR7 harness.
Once you have figured out the harness connections and such, you'll need
to find the correct wires to connect to the car. You'll need to connect
the Keep Alive Power(usually Pin 1) directly to the battery so the
computer always has power. You'll need the Start/Run 12 volt
source(which is coil power in
this case), you'll need the tach signal so the car knows when to fire.
And you'll need power for the EEC relay and fuel pump relay. Both being
a 12 volt source.
Once you have all of that taken care of you should check and recheck
all your connections and grounds as a simple ground can cause the car
not to start. Also make sure you have sufficient grounds as a ground to
small can cause a melted wire or worse, a fire.
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