Supply +15

Supply +15:

Operation
The positive supply from battery 1 is taken to ignition switch 20. When the ignition switch is in the drive or start position, current will flow from terminal 15 of the ignition switch, across fuse 13, to distribution terminal +15 (159). The following components are supplied from the distribution terminal:
- Time-delay relay 26 for the radiator fan
- Fuel gauge 47A
- Fuel reserve warning lamp 47B
- Coolant temperature gauge 47C
- Charging warning lamp 47E
- Brake fluid level warning lamp 47F
- Handbrake warning lamp 47M
- CHECK ENGINE warning lamp 47P
- ABS warning lamp 47Q
- Washer fluid level warning lamp 47R
- Timing service instrument socket 73
- Seat-belt/ignition key warning relay 82
- Tachometer 110
- Relay 113 for the rear window heater element
- Sensor 132 for the speed transmitter (1987)
- EZK test socket 145
- Ignition pulse amplifier 147 (1987)
- Time delay relay 151 for the interior lighting
- Relay 156 for the AC and ACC radiator fan
- Fuel system control unit 200
- EDU1/EDU2 trip computer 210
- Pictogram 213
- Filament monitor 228A (glove compartment)
- DCC trip computer 241
- Connection 289 for burglar alarm control unit
- Control unit 356 for speed warning (1987)

1987 model
The supply is also taken from terminal 15 of the ignition switch directly to ignition system amplifier 146, to ignition coil 5, and to EZK control unit 176.

1988 model
The supply is also taken from terminal 15 of the ignition switch directly to sensor 132 for the speed transmitter, control unit 356 for the speed warning and to EZK control unit 176.

Ignition system amplifier 146 and ignition coil 5 are supplied via fuse 9 in electrical distribution box 342, in the engine compartment.

Fault-tracing hints
1. Check the battery voltage.
2. Check the terminals of distribution block 75 and of terminal +15 (159).
3. Set the ignition switch to the drive position and check that the supply from fuse 13 (1987) or fuses 9 and 13 (1988) is live.
4. Check the relevant wiring.