Fusebox and relays CE1
For CE2 see here
CE1 Fusebox Fuses & Relays:
Fuse No. Description [Ampere Rating]
1 Radiator cooling fan [30]
2 Brake lights [10]
3 Cigarette lighter, radio, dash clocks, interior lights, central locking [15]
4 Hazard switch [15]
5 Fuel pump (gasoline engines) [15]
6 Open or fog lights [10]
7 Rear lights, parking lights, side lights (left side) [10]
8 Rear lights, parking lights, side lights (right side) [10]
9 High beam, right, high beam indicator light [10]
10 High beam, left [10]
11 Windscreen wipers/washers [15]
12 Rear wiper, heated seats, electric windows & mirrors [15]
13 Heated rear screen [15]
14 Heater blower, glove box light [20]
15 Reverse lights, automatic transmission console light [10]
16 Horn [15]
17 Digifant ECU, 16v FEI module [10]
18 Dual horn, coolant warning light control relay [15]
19 Turn signals, brake warning light [10]
20 Number plate lights, dash lighting on later models [10]
21 Headlights (Low beam, left) [10]
22 Headlights (Low beam, right) [10]
Relay No. Description
1 Open or Digifant relay
2 Fuel pump (fuel injection) Glow plugs (diesel)
3 Seat belt warning
4 Shift light/MPG gauge relay (1985-1987)
5 A/C relay
6 Dual horns
7 Open or front fogs
8 Load reduction/x-over relay
9 Open
10 Windscreen wiper
11 Rear wiper
12 Indicators, hazard switch
13 Open or electric windows
14 Cooling fan after-run (except 16-valve)
15 Passive restraint (1988, 1989) or ABS/coolant temperature relay
16 Idle speed boost control relay (k-jet 8v)
17 A/C thermofuse or ABS
18 Coolant warning light control relay
19 Electric window relay
20 Heated seats (left)
21 Heated seats (right)
22 Oxygen sensor system power supply (US cars w/CIS) / Automatic transmission relay
23 Electric window thermofuse (30A)
24 Glow plug fuse (Diesel-50A)
CE1 Fusebox - Rear Connections
Connections and plugs on rear of fuse/relay panel:
A Blue 28 pin Instrument cluster wiring harness
B Red 28 pin Instrument cluster wiring harness (position 5 open)
C Yellow 22 pin Engine compartment/engine management, left side (position 10 open)
D White 29 pin Engine compartment/wiper motor wiring harness, right side (position 6. 10, 14, 18, 27, 28 open)
E Black 18 pin Rear wiring harness (position 17 open)
G n/a 1 pin 10 individual circuits
H Brown 6 pin Air conditioning/coolant fan relay wiring harness
K Neutral 5 pin Seat belt warning system/coolant level wiring harness
L Grey 4 pin Horn wiring harness
L Black 4 pin Headlight/dimmer switch wiring harness
M Black 2 pin Steering column switch wiring harness
M Black 2 pin Headlight/dimmer switch wiring harness
N Red 1 pin Separately fused circuits (glow plug wiring harness, fuel injectors)
P Red 7 pin 7 single point connectors for terminal 30 circuit
R Green 2 pin Open/ECU power supply relay
Taken from Rubjonny's original post is here:
http://www.clubgti.com/showthread.php?219775-Fusebox-FAQ