I don't know if this helps or makes it more complicated, but here's a chart I started a few years ago. It's never been QC'ed so be forewarned.
As an example on how to read this, the "Turn Signal" circuit is on page BE-11, involves junction connectors C-2, 3, 4, and 5, Fuse #3, which is 10 Amps, uses white, green and black wires (specifically white/red, green/red, green/black, black, and black/white).
The way I've used this is to try and match up the colors, then go the the FSM page BE-xx to read the wiring diagram.
Junction
Fuse
Wire Color (primary, secondary)
System
Page (BE-)
Block Connectors
No.
Amp
Red
White
Green
Blue
Yellow
Black
Head Light
10
1345
1
10
R, RB, RW
W, WR
Head Light
10
7
2
10
R, RB, RW, RY
W, WR
Turn Signal
11
2345
3
10
WR
GR, GB
B, BW
Haz Warning
12
12346
11
10
WR
GW
BY
Stop Lamp
13
26
11
10
W, WR
B, BW
Clearance & Tail Lmp
14
1256
5
20
W, WR
GW
B
Reverse Lamp
15
3567
9
20
RB
W, WR
LB
Meter Lights
16
246
5
20
RL
W, WR
GL, GW
B
Console Lights
17
12346
5
20
RL
GW
Interior Lamp
18
16
6
10
RL, RB
W, WR
B
Glovebox & Cig Lighter Light
19
246
5
20
W, WR
GL, GW
B
Map Light
20
46
6
10
RL
W, WR
B
Tachometer
30
345
3
10
W, WR
G
LB
B, BW
Water Temp/Pressure Gauge
34
234
3
10
W, WR
G
YB, YW
B, BW
Amperage/Fuel Gauge
35
345
3
10
W, WR
G
Y
B, BW
Brake Warning
36
156
NA
#N/A
W, WR
G, GY
BW
Heater Illumination
53
12346
5
20
RL
W
GR, GW
B
Heater
54
35
8
10
W, WR
G
L, LR, LW
Heater
54
6
13
20
W, WR
G
L, LR, LW
Heater (resistor)
54
NA
#N/A
B
Horn
58
16
10
10
W, WR
G, GB, GR
Washer
64
3457
9
20
LR, LW
Wipers
67
234567
10
10
W, WR
L, LW, LY
Y
B
Lighter
69
146
7
20
W, WR
LW
B
Clock
70
146
6
10
RL
W, WR
B
Window Defogger
74
3567
8
10
R
W, WR
LR, LW
B
Radio
78
357
8
10
W, WB, WR
L, LR, LW
B
Theft Protection
81
146
6
10
RL
W, WR
B
Choke Warning Light
85
357
3
10
W, WR
G
B, BW
Interlock
99
7
14
10
W, WR
B
Ignition
102
35
4
10
WR
BW, BY
Interlock Relay
103
457
NA
#N/A
WR
L, LR
BR, BW, BY
Neutral Switch Warning
105
457
NA
#N/A
LgB
BY
B
Engine Revolution Sensor
106
6
14
10
W, WR
B
Emergency Switch
108
45
NA
#N/A
WR
L
Y, YB
B, BW, BY
Battery (Power Inlet)
106
14
10
W, WR
B
Junction Blocks
Green
C-1
Blue
C-2
Black
C-3
Brown
C-4
Green
C-5
White
C-6
Black
C-7