Beginning with 1974 models, the fuse box is located on the left side panel of the luggage compartment near the brake fluid reservoir. The plastic cover can be removed from the fuse box by lightly pressing its top downward.
The fuse box contains 18 fuses and, depending on options. 1 to 3 standard relays.
1 - Relay for air conditioning
2 - Relay for fog lamps
3 - Relay for signal horn
Mounting space for 4 additional relays has been provided for possible expansion of the electrical system.
A fuse listing is contained in the wiring diagrams. The fuses are identified in the diagrams in an ascending numerical order whereby the forward-most fuse in the vehicle bears the designation S 1.
Additional fuses and relays are located on the luggage compartment floor (left, as seen in direction of driving), as well as on the mounting plate in the engine compartment.
1 - Vacant
2 - Relay for heated windshield
3 - Relay for emergency flasher for safety belt warning system
1 - Relay for single stage heated rear window
(not installed with two-stage version)
2 - Cold start relay
3 - control relay for two-stage heated rear window (not installed with single stage version)
■ - voltage regulator 5 - CDS trigger unit G - Rear fuse box
Vehicles not equipped with CIS (fuel injection) have the RPM-transducer installed adjacent to the two-stage heated rear window relay.
The 1975 911 S and Carrera models have a modified relay plate.
1 - Relay plate
2 - Standard relay for 1-stage rear window defogger (deleted for 2-stage heater)
3 ^ Standard relay for heater blower
4 - Standard relay for warm-up regulator
5 - Control relay for 2-stage rear window defogger (deleted for 1-stage heater)
6 - Voltage regulator
7 - Capacitor discharge ignition control unit
8 - Radio (interference) suppressor
9 - Rear fuse box (fuses S 22 thru S 24 of wiring diagram) Note
The relay positions for the heater blower and warm-up regulator were interchanged in some vehicles.
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