Wiring diagram--just want to know which wire is the carrier, which is the common, which is the hot. One is red, one is yellow, one is black.

Black = AC hot
Red = switched AC hot
Yellow = AC hot from a another source - another control panel as an example.
White = neutral
red w/white tracer = switched neutral
Green or green w/ yellow tracer = ground/earth ground
blue = DC voltage, ie, 12vdc, 24vdc
white w/blue tracer = dc common
Brown = AC 3 pahse - phase A
Orange = AC 3 pahse - phase B
Yellow = AC 3 Phase - phase C
shileds: think of current loops
2 cond
clear or red = +
black = -(neg)
3 cond
red = power (24vdc typically for transducers)
clear = + (signal output)
black = - (signal common)
Hope this helps, oh, and any panel I have design and wired this way is easily understaood by 99% of all service and electrical people I have worked with.

Here's some more info diagrams for you http://www.electricmotorwarehouse.com/aosmith/AO_CONNECT.PDF L1 is one hot wire L2 is the other hot wire. L1 can not be connected to a L2 wire and L2 can not be connected to a L1. Ground only to ground.

ok i found a picture diagram for what looks like to be your harness but i you need to get the numbers off the wireing harness its self
these can be very helpful in locating the proper diagram and wireing instructions for this harness
now the pictures and color codes is on a picture at bottom of the link i put in here so hope the link helps youll have to zoom the pic
there is two types of harnesses with the four points (meaning ends)
one is for the clutch and one is for back panel behind steering wheel the guages red is always hot red and black striped is key accessorie hot
yellow is usually the on position once key starts to engage blades or clutch
the blacks are grounds
need a good pic of this harness with out hand in way and closer but showing all the end points ive worked on these but i would rather see it better with more pics if possible

Here is the normal way of wiring a thermostat:

Y=yellow (cooling)
G=green (fan)
R=hot (red)
W=white (heat)
C=blue or black (common) only on some thermostats

If you have a heat pump: o=orange (reversing valve)

Some thermostats have "rc" and "rh". These terminals must be jumpered together or the thermostat will not work. Hope this helps you.

Zoom yellow
Focus Green
Common Black
Common Red

video (aiv) AUTO IRIS lens back side
1 = Red wire VCC (+9 to +18 VDC) _____
4 = Black wire Ground p ' '
3 = White wire Video Signal L ' 2 1 '
u ' * * '
g ' '
1 = red ' 4 3 '
2 = nc ' * * '
3 = white \ /
4 = black \ /
\__/

there should be a red wire and a black wire and a yellow red is hot black is ground and yellow is cons.

If you know the motor brand you could call a local motor repair shop and they are usually glad to help. A lot of motors are usually color coded with red wire low speed and black as high speed and on 230 volt motors Red and Black wires are usually L1 and L2 so I'm unsure as to which wires go where and what the voltage is. If you know for sure this is a permanent split capacitor motor then you should be able to ohm it out. start and run would be the total sum of Common to run and common to start.
Do you have an Ohmmeter and do you know how to use one?
For instance by ohming it out if (yellow to red was 5.0 ohms start to run) and (black to red was 1.8 ohms common to run) and (black to yellow was 3.2 ohms common to start), that would mean (yellow to the start side of capacitor) and (red to the run or other side of capacitor and jumper from red to L2) (some capacitors you can wire any way no identified terminal) and (black to L2 or common).

This is a general wiring diagram for most head units.
Should be what you're looking for.

you have 2 hots =240vac (usally Black or red or in your case Yellow) and one common (usally white) and maybe one ground (Green or bare copper)

According to FCC law all aftermarket sterio equipment has to have the same code, they may be diffrent
as for the ford
Black Wire - Ground Black With White Stripe Wire - Right Rear Speaker Light Blue With Red Stripe Wire - From Light Switch To Radio (light) (Headlights) Light Green With Yellow Stripe Wire - Hot At All Times To Radio Orange With Black Stripe Wire - From Light Switch To Radio (Light) (Parking) Orange With Red Stripe Wire - Right Rear Speaker Red Wire - To Ground With Black Wire Yellow With Black Stripe Wire - Hot In Accessory Or Run To Radio