For each schematic in the main sections of the electrical manual, there is a printed connection callout on the sheet preceding it. That is the place to start.

The connections to a controller module and information about the connection such as voltage range is listed on the left hand side of that page. The pin number and wiring colour will be listed. If you then look at the figure and find the pin, you can trace it back to the device and confirm that it is the same color all the way, and whether there are any splice points or harness points where you might be able to splice in easier.

The colour codes are listed in the early part of the manual. Some of them are hard to remember, such as "N" for ???.

The electrical diagrams are available in JTIS, or as separate downloads that can be found in the model specific FAQ's.

 

In the UK, vehicle wiring is to British Standard BS-AU7. There are 11 colour codes:

B = BLACK
G = GREEN
K = PINK
N = BROWN
O = ORANGE
P = PURPLE
R = RED
S = SLATE
U = BLUE
W = WHITE
Y = YELLOW

In addition, there are 3 shades:
D = Dark
L = Light
M = Medium

Graham

 

That's the way I remember them for the past 40 years.

This whole 'British car repair/collecting' thing I have been going through and making a good living with started with a 1958 MGA for sale down the street back in the early 70's. Luckily all the British cars used the same colour scheme.

bob gauff

 

Thanks for the additions

The original post was sliced from a more specific query involving wiring diagrams. I figured it would be more useful as a general topic addition.