The Buick Estate Wagon from 1977 to 1984 did not have a modern fuse box and relay system as seen in contemporary vehicles. Instead, it featured simpler electrical systems with fuses typically housed in a centralized location, often under the dashboard or in the engine compartment.
These fuses protected essential electrical circuits like lights, heating systems, and power accessories. However, relays, as electrically controlled switches, were less commonly used during that era compared to modern vehicles.
Overall, while the Buick Estate Wagon of 1977–1984 showcased Buick’s dedication to luxury and spaciousness in the station wagon segment, its electrical components were more basic compared to today’s standards.
(1977–1984) Buick Estate Wagon fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Buick Estate Wagon 1977–1984 fuse assignment
- Circuit Breaker: Headlight Circuit — A thermo circuit breaker is incorporated in the headlight switch assembly to protect headlight circuits. Windshield Wiper — Integral with windshield wiper motor.
Year of production: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984
Fuse box diagram
| Fuse | [Amps] | Protected Component |
| 1 | 5A | Instrument illumination, headlight warning and electronic air conditioning |
| 2 | 20A | Electric choke |
| 3 | 5A | Instrument illumination, headlight warning |
| 4 | 30A | Circuit breaker: Power windows and roof, fuel cap lock release |
| 5 | — | — |
| 6 | 25A | Heater, air conditioning, trunk lid release, radio capacitor |
| 7 | 10A | Electronic Control Module |
| 8 | 10A | Diesel engine fuse |
| 9 | 25A | Windshield wiper and washer |
| 10 | 20A | Hazard and stop lights |
| 11 | 20A | Seat belt light and buzzer, trunk ajar, transmission downshift and C-4 or E.S.C. jumper, heated back light relay, map and fuel economy lights, instrument gauges and indicator lights |
| 12 | 20A | Tail, side marker, parking and license lights, clock radio |
| 13 | 10A | Radio, cruise control |
| 14 | 30A | Circuit breaker: Power seats, door locks, heated rear window feed, tailgate window |
| 15 | 20A | Turn signal and back-up lights |
| 16 | 20A | Cigar lighter, glove box light, speed and key warning buzzer, power antenna, clock radio, clock, pulse wiper, air conditioning |
| 17 | 20A | Dome and sail panel lights, trunk light, reading light, vanity light, headlight on warning, automatic door locks and rear cigar lighter, tailgate ajar |
| 18 | — | — |
| 19 | 10A | Instrument gauges, indicator lights, transmission converter clutch and cruise control, Electric choke |
Conclusion
For owners and enthusiasts of classic Buick Estate Wagon models from 1977-1984, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Buick’s craftsmanship and innovation in the automotive industry during that era.
