2021 McLaren Super Series 765LT Fuses and Fuse Box
The 2021 McLaren Super Series 765LT is a high-performance sports car that challenges the limits of automotive engineering and design. The fuse box is a crucial yet frequently overlooked component of this technological marvel. In this introduction, we will discuss the significance of fuses and the fuse box in the 2021 McLaren Super Series 765LT, demonstrating how this vital system protects the vehicle’s intricate electrical and electronic components. The fuse box of the 765LT is a marvel of modern engineering, positioned to facilitate maintenance and replacement while preserving a sleek, unobtrusive design that complements the car’s aesthetics. This compartment conceals a network of fuses, each of which is designed to break the electrical circuit when it becomes overwhelmed, protecting the car’s vital systems. This exploration of the fuses and fuse box of the 2021 McLaren Super Series 765LT will reveal the technology and precision that underpin this essential component of the vehicle’s electrical system, providing a fascinating glimpse into the meticulous craftsmanship and innovation that make this sports car truly remarkable. Join us as we explore the inner workings of a remarkable vehicle, where even apparently insignificant components, such as fuses and their housing, play a vital role in the vehicle’s exceptional performance and safety.
Fuses
Fuse replacement
WARNING: Fuses protect the vehicle’s electrical systems. The failure of any fuse will render the system it protects inoperative.
Use replacement fuses of the same rating and type. Incorrect fuse ratings can overload a system and cause a fire or malfunction. Blown fuses should be replaced and no attempt should be made to repair a blown fuse.
NOTE: Before removing a fuse, turn off all electrical equipment and switch off the ignition.
There are three fuse boxes fitted to your McLaren.
| Fuse Box | Location |
| Main fuse box | Behind a panel in the rear bulkhead, behind the left-hand seat. |
| Secondary fuse box | Below the dashboard on the passenger’s side. |
| Battery fuse box | On top of the battery, in the luggage compartment, beneath the luggage compartment cover. Main fuse box Main fuse box access |
Main fuse box
Main fuse box access
- To access the main fuse box:
- If a manual seat is fitted, lift the tilt release lever and tilt the left-hand seat backrest forwards
- If an electric seat is fitted, pull the release strap (shown above) and tilt the left-hand seat backrest forwards
- If a race seat is fitted, slide the seat forwards
- Release the two lower clips securing the panel to the bulkhead and remove the panel
- Refer to the fuse specification to determine which fuse protects the non-functioning electrical system, see Main fuse box fuse specification chart.
NOTE: A label identifying the fuses is attached to the inside of the access panel.
Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, check the fuse specification chart. - Fit the access panel by inserting the two upper retaining clips in the bulkhead and securing with the two lower clips.
NOTE: If a replacement fuse does not solve the electrical problem, or it fails immediately, contact your McLaren retailer.
Main fuse box fuse specification chart
| No. | Amps | Circuit protected |
| F1 | 60 | Right-Hand Secondary Air Pump |
| F2 | 60 | Left-Hand Secondary Air Pump |
| F3 | 20 | Tonneau Motor Right-Hand (Spider Only) |
| F4 | 20 | Tonneau Motor Left-Hand (Spider Only) |
| F5 | 30 | Transmission Control Unit |
| F6 | 30 | Transmission Control Unit |
| F7 | 30 | Starter |
| No. | Amps | Circuit protected |
| F8 | 30 | Heated Rear Window |
| F9 | 30 | Audio Amplifier (16 Channel) |
| F10 | 20 | Roof Central ECU (Spider Only) |
| F11 | 20 | Roof Central ECU (Spider Only) |
| F12 | 20 | Roof Main Motor Left-Hand (Spider Only) |
| F13 | 5 | Transmission Control Unit |
| F14 | 5 | Engine Control Module |
| F15 | 10 | Relays |
| F16 | – | – |
| F17 | 3 | Door Locking Switch |
| F18 | 50 | ECU Main Relay Feed |
| F19 | 40 | Fuel Pump |
| F20 | 30 | Seat Driver’s |
| No. | Amps | Circuit protected |
| F21 | 30 | Seat Passenger’s |
| F22 | 20 | Roof Main Motor Right-Hand (Spider Only) |
| F23 | 5 | Tilt and Microwave Sensor |
| F24 | 20 | Infotainment Control Unit |
| F25 | 10 | Driver’s/Passenger’s Door Latch |
| F26 | 3 | Auxiliary USB Board |
| F27 | – | – |
| F28 | – | – |
| F29 | – | – |
| F30 | – | – |
| F31 | 50 | Cooling Fan Left-Hand |
| F32 | 50 | Cooling Fan Right-Hand |
| F33 | – | – |
| No. | Amps | Circuit protected |
| F34 | – | – |
| F35 | – | – |
| F36 | 20 | ECM Power Supply |
| F37 | 15 | Canister Purge, Lambda Sensors, Cooling Fan Relay Coil |
| F38 | 15 | Fuel Injection and Ignition – Left-Hand Bank |
| F39 | 15 | Fuel Injection and Ignition – Right-Hand Bank |
| F40 | 10 | Engine Ancillaries |
| R41 | – | – |
| R42 | – | – |
| R43 | – | – |
| R44 | – | – |
| F45 | 10 | Electrical Thermostats, Camshaft Actuators |
Secondary fuse box
Secondary fuse box access
- Access to the secondary fuse box is gained by lowering the closing panel below the dashboard on the passenger’s side.
- Remove the two front screws (1).
- Remove the side fixing clip (2).
NOTE: If you wish to lower the closing panel fully, also remove the two clips at the rear (3). - Lower the closing panel, sufficiently to gain access to the fuse box.
NOTE: Do not lower the closing panel further than necessary as it could be damaged. - Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, check the fuse specification chart, see Secondary fuse box fuse specification chart
- Raise the closing panel into position, fit the clip and fit and tighten the two front screws.
Secondary fuse box fuse specification chart
| No. | Amps | Circuit protected |
| F1 | 20 | Driver’s Door |
| F2 | 20 | Passenger’s Door |
| F3 | 25 | Lights |
| F4 | 35 | Lights |
| F5 | 35 | Body |
| F6 | 35 | Body |
| F7 | 35 | Alarm |
| F8 | – | – |
| F9 | – | – |
| F10 | – | – |
| F11 | – | – |
| F12 | – | – |
| F13 | – | – |
| No. | Amps | Circuit protected |
| F14 | 5 | Transmission Control Unit |
| F15 | 10 | Air Conditioning |
| F16 | 3 | Alarm Control Unit |
| F17 | 3 | Tracker |
| F18 | 7.5 | Alarm |
| F19 | 5 | Central Display |
| F20 | 3 | Transmission Control Unit Relays |
| F21 | 15 | Display Control Unit |
| F22 | – | – |
| F23 | 5 | Driver Display |
| F24 | 10 | Development Connector |
| F25 | 10 | OBD2 Diagnostics |
| F26 | – | – |
| No. | Amps | Circuit protected |
| F27 | – | – |
| F28 | – | – |
| R29 | – | Transmission Control Unit |
| R30 | – | Transmission Control Unit |
Battery fuse box
Battery fuse box access
- Open the luggage compartment lid and remove any items stowed inside.
- Remove the 2-quarter turn screws securing the top of the battery access cover.
- Open the top of the battery access cover and disconnect the 2 electrical connectors on the back of the cover.
- Lift the battery access cover upwards, off its locating pegs, and remove.
- Press the 2 catches on the right-hand side of the cover and remove the cover from the fuse box.
- Remove the appropriate fuse and replace it with a fuse of the same value as the original. If in doubt, see Battery fuse box fuse specification chart.
- Engage the left-hand side of the cover with the fuse box, and push the right-hand side down to fully engage the clips.
- Refit the battery access cover, connect the 2 electrical connectors and secure with the 2 screws.
- Stow the contents removed from the luggage compartment.
Battery fuse box fuse specification chart
| No. | Amps | Circuit protected |
| F1 | 30 | Transmission Control Unit |
| F2 | 30 | Transmission Control Unit |
| F3 | 30 | Air Conditioning – Motor – Control Module |
| F4 | 50 | Secondary Fuse Box Supply |
| F5 | 40 | Electronic Stability Control Valves |
| F6 | 40 | Electronic Stability Control Motor |
| F7 | 20 | Auxiliary Power Socket – Luggage Compartment |
| F8 | 40 | Secondary Fuse Box Supply |
| F9 | 100 | Electro-Hydraulic Power Assisted Steering |
| F10 | 200 | Main Fuse Box Supply |
| No. | Amps | Circuit protected |
| F11 | 30 | Secondary Fuse Box Supply |
FAQs
What is the purpose of fuses in a vehicle’s electrical system?
Fuses are safety devices that protect the electrical system of a vehicle from overloads and short circuits.
The 2021 McLaren 765LT fuse box is typically located in the engine compartment or interior cabin, depending on the fuse.
Consult your owner’s manual for specific access instructions to the fuse box. It may require removing a partition or cover.
The 765LT employs spade or plug-in fuses, also known as blade-style fuses.
A fuse with a blown filament or a visibly burnt appearance. Consult your manual for fuse identification information.
You can replace fuses on your own, but you must use the correct amperage rating and observe all safety precautions. When in doubt, consult a professional.
Spare fuses are frequently included in the fuse box or can be purchased from auto parts retailers.
Replacement fuses should have the same amperage rating as the ruptured fuse.
Some vehicles are equipped with additional fuses in the fuse compartment. Check the documentation included or the fuse box itself.
Mini fuses are smaller than standard fuses and are used in certain vehicles for specific circuits.
A pair of needle-nose pliers or a fuse remover may be required to remove and replace fuses safely.
No, using a fuse with a higher amperage can damage the electrical system of your vehicle. Always employ the appropriate amperage rating.
If a fuse continues to explode, there may be an underlying electrical problem. Consult a qualified mechanic for diagnosis and repair.
It is advisable to inspect your fuses periodically or whenever you experience an electrical problem.
OEM (original equipment manufacturer) fuses are recommended to assure compatibility and safety.
Useful Link
View Full PDF: 2021 McLaren Super Series 765LT User Manual | Auto User Guide
2021 McLaren Super Series 765LT Lights and Wipers Setup Instructions