We'll take the following as an example. The wiring for a 2003 Mitsu Galant
Reverse Light red/blue + pin 9, 43 pin plug in DKP
Speed Sense yellow/black data link conn., R of column
the first thing is obviously what the wire is, reverse signal and speed signal.
The Second is the color. This is where some people get confused. The first color list is the color of the majority of the wire. The second color is the color of the stripe on the wire. Not all will have a stripe. So in the case of the reverse light it's a red wire with a blue stripe on it. And the speed sense will be yellow with a black stripe.
The final item is the location. Most of the time I try and write out the abbreviations, but sometimes I forget. So I'll list here the abbreviations I can think of and if anyone comes up with some I missed let me know I'll add them
DKP = Driver's kick panel (generally behind the area by your left foot if you were sitting in the driver's seat)
PKP = Passenger's kick panel ( same as above but right foot sitting in the passenger's seat.
DLC = data link connector aka diagnostics plug aka obd2 plug
GEM = Generic Electronics module. The computer in fords that controls convience items like door locks and such
BCM = Body Control Module
ECM = Engine Control Module
ECU = Engine Control Unit
ETACS ECU = Electronic Timing and Control System
PCM = Powertrain control Module
Harness to rear = Lift up the carpet on whichever side of the car it says, and you should seee a large bundle of wires that looks to run from the front of the car to the back.
that's all for now. Also if you're looking for wiring info, type in the model, make, and the words "merry xmas" the majority of my posts with wiring info will have those 2 words at the end to help locate. All in all have fun and happy installing.
Josh