Merged image of a V8 engine, Sherman Tank, Clementine the Cat, and my MGA in the Alpes

Find application by colours
main colour tracer  

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Main colour
 / Tracer Application
1      
Black
 / Blue  Tachometer generator to tachometer 
2      
Black
 / Brown  Tachometer generator to tachometer 
3      
Black
 / Green  Relay to radiator fan motor 
4      
Black
 / Light Green  Vacuum brake switch or brake differential pressure valve to warning light and / or buzzer 
5      
Black
 / Orange  Radiator fan motor to thermal switch 
6      
Black
 / Purple  Temperature switch to warning light 
7      
Black
 / Red  Electric or electronic speedometer to sensor 
8      
Black
 / White  Brake fluid level warning light to switch and handbrake switch, or radio to speakers 
9      
Black
 / Yellow  Electric speedometer 
10      
Black
 / Black  All earth connections 
11      
Blue
 / Black  Fuse to right-hand main headlamp 
12      
Blue
 / Brown  Headlamp relay to headlamp fuse 
13      
Blue
 / Grey  Headlamp main beam fuse to left-hand headlamp or inboard headlamps when independently fused 
14      
Blue
 / Light Green  Headlamp wiper motor to headlamp wash pump motor 
15      
Blue
 / Pink  Fuse to left-hand dip headlamp 
16      
Blue
 / Red  a) Dip switch to headlamp dip beam fuse b) Fuse to right-hand dip headlamp 
17      
Blue
 / White  a) Dip switch to headlamp main beam fuse b) Headlamp flasher to main beam fuse c) Dip switch main beam warning light d) Dip switch to long-range driving light switch 
18      
Blue
 / Yellow  Long-range driving light switch to lamp 
19      
Blue
 / Blue  Lighting switch (head) to dip switch 
20      
Blue
 / Orange  Fuse to right-hand dip headlamp 
21      
Brown
 / Black  Alternator battery sensing lead 
22      
Brown
 / Blue  Control box (compensated voltage control only) to ignition switch and lighting switch (feed) 
23      
Brown
 / Green  a) Dynamo 'F' to control box 'F' b) Alternator field 'F' to control box 'F' 
24      
Brown
 / Grey  Starter relay contact to starter solenoid 
25      
Brown
 / Orange  Fuel shut-off (diesel stop) 
26      
Brown
 / Purple  Alternator regulator feed 
27      
Brown
 / Red  a) Compression ignition starting aid to switch b) Main battery feed to double pole ignition switch 
28      
Brown
 / White  a) Ammeter to control box b) Ammeter to main alternator terminal 
29      
Brown
 / Yellow  Alternator to 'no charge' warning light 
30      
Brown
 / Brown  Main battery lead 
31      
Green
 / Black  Fuel gauge to fuel tank unit or changeover switch or voltage stabilizer to tank units 
32      
Green
 / Blue  Water temperature gauge to temperature unit 
33      
Green
 / Brown  Switch to reverse lamp 
34      
Green
 / Grey  a) Heater motor to switch ('fast' on two- or three-speed motor) b) Coolant level unit to warning light 
35      
Green
 / Light Green  Hazard flasher unit to hazard pilot lamp or lamp failure unit to stop lamp bulbs 
36      
Green
 / Orange  Low fuel level switch to warning light 
37      
Green
 / Pink  Fuse to flasher unit 
38      
Green
 / Purple  Stop lamp switch to stop lamps, or stop lamp switch to lamp failure unit 
39      
Green
 / Red  Direction indicator switch to left-hand flasher lamps 
40      
Green
 / White  Direction indicator switch to right hand flasher lamps 
41      
Green
 / Yellow  Heater motor to switch single speed (or to 'slow' on tow- or three-speed motor) 
42      
Green
 / Green  Accessories fused via ignition switch 
43      
Grey
 / Grey  Window lift main lead 
44      
Light Green
 / Black  Front screen jet switch to screen jet motor 
45      
Light Green
 / Blue  a) Flasher switch to left-hand flasher warning light b) Coolant level sensor to control unit c) Test switch to coolant level control unit 
46      
Light Green
 / Brown  Flasher switch to flasher unit 
47      
Light Green
 / Grey  Fuel tank changeover switch to left-hand tank unit; or entry and exit door open switch to door actuator 
48      
Light Green
 / Orange  Rear window wash switch to wash pump; or cab lock-down switch to warning light 
49      
Light Green
 / Purple  Flasher unit to flasher warning light 
50      
Light Green
 / Red  Fuel tank changeover switch to right-hand tank unit or entry and exit door closed switch to door actuator 
51      
Light Green
 / White  Low air pressure switch to buzzer and warning light 
52      
Light Green
 / Yellow  Flasher switch to right-hand warning light; or differential lock switch to differential lock warning light 
53      
Light Green
 / Light Green  Instrument voltage stabilizer to instruments 
54      
Light green
 / Green  Start inhibitor relay to change speed switch; or switch to heater blower motor second speed on three-speed unit 
55      
Orange
 / Black  Switch to front screen wiper motor parking circuit, timer or intermittent unit 
56      
Orange
 / Blue  Switch to front screen wiper motor first speed timer or intermittent unit 
57      
Orange
 / Green  Switch to front screen wiper motor second speed 
58      
Orange
 / Grey  Timer or relay to headlamp or rear window wiper motor parking circuit 
59      
Orange
 / Light Green  Switch to headlamp or rear window wiper motor parking circuit timer or relay coil 
60      
Orange
 / Pink  Timer or relay to headlamp or rear window wiper motor feed 
61      
Orange
 / Purple  Timer or intermittent unit to motor parking circuit 
62      
Orange
 / White  Timer or intermittent unit to motor parking circuit 
63      
Orange
 / Yellow  Switch to headlamp or rear window wiper motor feed, timer or relay coil 
64      
Orange
 / Orange  Wiper circuits fused via ignition switch 
65      
Pink
 / White  Ballast terminal to ignition distributor 
66      
Purple
 / Black  Horn to horn relay to horn push 
67      
Purple
 / Blue  Fuse to heated rear window relay or switch and warning light 
68      
Purple
 / Brown  Horn fuse to horn relay when horn is fused separately 
69      
Purple
 / Green  Fuse to hazard flasher 
70      
Purple
 / Grey  Aerial lift motor to switch up 
71      
Purple
 / Light Green  Fuse to relay for screen demist 
72      
Purple
 / Orange  Aerial lift motor to switch down 
73      
Purple
 / Pink  Rear heated window to switch or relay 
74      
Purple
 / Red  Switches to map light, under bonnet light, glove box light and boot lamp when fed direct from battery fuse 
75      
Purple
 / White  Interior lights to switch (subsidiary circuit door safety lights to switch) 
76      
Purple
 / Yellow  Horn to horn relay 
77      
Purple
 / Purple  Accessories fed direct from battery via fuse 
78      
Red
 / Black  Left-hand,sidelamp fuse to side and tail lamps and number plate illumination 
79      
Red
 / Blue  Front fog lamp fuse to fog lamp switch 
80      
Red
 / Brown  Rear fog guard switch to lamps 
81      
Red
 / Green  Bulb failure unit to right-hand-side and rear lamps 
82      
Red
 / Grey  Lamp failure unit to left-hand side and tail lamps 
83      
Red
 / Orange  Fusebox to rear fog guard switch 
84      
Red
 / Pink  Sidelamp fuse to lighting relay 
85      
Red
 / Purple  Switches to map light, under bonnet light, glove box light and boot lamp when sidelamp circuit fed 
86      
Red
 / White  a)Sidelamp fuse to right-hand side and rear lamps b)Sidelamp fuse to panel light rheostat c)Fuse to panel light switch or rheostat d) Fuse to fibre optic source 
87      
Red
 / Yellow  Fog lamp switch to fog lamp or front fog fuse to fog lamps 
88      
Red
 / Red  Main feed to all circuits mastered by sidelamp switch 
89      
White
 / Black  Ignition coil contact breaker to distributor contact breaker, or distributor side of coil to voltage impulse tachometer 
90      
White
 / Blue  Choke switch to choke solenoid (unfused) and/or choke to switch to warning light, or electronic ignition distributor to drive resistor 
91      
White
 / Brown  Oil pressure switch to warning light or gauge, or starter relay to oil pressure switch 
92      
White
 / Green  Fuel pump no 2 or left-hand to changeover switch 
93      
White
 / Grey  Current tachometer to ignition coil 
94      
White
 / Light Green  Start switch to starter interlock or oil pressure switch to fuel pump or start inhibitor switch to starter relay or solenoid 
95      
White
 / Orange  Hazard warning lead to switch 
96      
White
 / Pink  Ignition switch to radio fuse 
97      
White
 / Purple  Fuel pump no 1 or right-hand to changeover switch 
98      
White
 / Red  Starter switch to starter solenoid or inhibitor switch or starter relay or ignition (start position) to bulb failure unit 
99      
White
 / Yellow  Ballast resistor to coil or starter solenoid to coil 
100      
White
 / White  Ignition switch or starter solenoid to ballast resistor 
101      
Yellow
 / Yellow  a) Overdrive b) Petrol injection c) Door locks d) Gear selector switch to start