Article 10 - Electrical System

A minimum electrical system comprising of at least two engine kill switches, a brake light, brake switch, battery, and associated wiring is required. The vehicle electrical system shall be designed and constructed in accordance with good engineering and electrical practices.

B.10.1 - Power Sources

B.10.1.1 - Batteries

B.10.1.1.1 - Mounting

All batteries shall be mounted with sound engineering practices and not come loose during normal operation, a collision or rollover. Battery terminals shall be insulated and protected against an electrical short.

B.10.1.1.2 - Sealed Batteries

All batteries must be factory sealed and maintenance free. Batteries shall be incapable of being opened or serviced and not leak in the event of a collision or rollover.

B.10.1.1.3 - Non-Rechargeable Batteries

Batteries not recharged by an engine alternator shall only power safety appliances (brake light, reverse light, reverse alarm). Batteries not recharged by an engine alternator shall not power any control or actuation function in the drivetrain, steering, or suspension systems. Any battery used for safety appliances (brake light, reverse light, reverse alarm) shall have sufficient electrical capacity to last the entire length of the endurance event.

B.10.1.1.4 - Rechargeable Batteries

Only batteries which are recharged by an engine alternator may be used to power control or actuation functions in the drivetrain, steering, or suspension systems.

B.10.1.2 - Engine Alternator

Only approved engine alternators may be used. See rule B.2.7.15 - Alternator for further information.

B.10.1.3 - Solar Panels

Solar panels are permitted to recharge on-board batteries.

B.10.2 - Wiring and Connectors

All vehicle wiring and connectors shall be cleanly and neatly installed. Wiring shall be routed away from sources of excessive heat, abrasion, chafing, and possible short circuit. Wiring shall be installed and routed such that it does not become a hazard to cockpit egress.

B.10.3 - Engine Kill Switches

B.10.3.1 - Quantity

Each vehicle shall be equipped with a minimum of two (2) engine kill switches.

B.10.3.2 - Required Switch

The vehicle shall be equipped with one or more of the following required switches:

Note: Older versions of the approved switches are allowed.

B.10.3.3 - Location

B.10.3.3.1 - Cockpit Switch

One of the required kill switches shall be located in the cockpit within easy reach of a driver that is properly seated and secured in the vehicle. Cockpit kill switches may not be located on removable steering wheels.

B.10.3.3.2 - External Switch

One of the required kill switches shall be located within easy access to track workers on the right side of the vehicle, aft of the plane of the RRH, and forward of the right FABUP. The external kill switch shall be generally perpendicular to the firewall (15 deg), below frame point BR, and no further than 180 mm (7.0 inches), dimension Z in Figure B-44 , below frame point BR, and shall be mounted on a tab connected directly to the RRH. The external kill switch shall not be recessed more than 51 mm (2.0 inches) from the outside edge of the RRH tube.

Figure B-44: Engine Kill Switch Mounting Position

B.10.3.4 - Mounting

All engine kill switches shall be rigidly mounted to the vehicle frame with unobstructed access to the switch. All engine kill switches shall be free and clear of sharp edges or other hazardous conditions to track workers or the driver. All switches shall be mechanically fastened to the frame. Adhesives are explicitly prohibited. Any and all fasteners used to mount an engine kill switch shall meet the requirements of Article 12 - Fasteners.

Exception: Rivets are acceptable fasteners for fastening kill switches to the mounting tab.

B.10.4 - Signaling

B.10.4.1 - Brake Light

All vehicles are required to have a functional brake light to signal to other drivers the vehicle is stopping or slowing down.

B.10.4.1.1 - Required Brake Light

Only the following brake lights are permitted. Brake lights not listed are explicitly prohibited. Modification of the brake light from the OEM design is explicitly prohibited. All brake lights shall be configured to be fully illuminated when the brakes are applied, and completely extinguished with the brakes are released.

B.10.4.1.2 - Location and Orientation

The vehicle brake light shall have a resilient and durable mount and be positioned at a minimum of 1000 mm (39.4 in.) above the ground. The vehicle brake light shall be oriented to be visible to trailing vehicles and shine parallel to the ground or at a slightly downward angle. Brake lights angled (aimed) above a horizontal plane are not permitted.

B.10.4.1.3 - Brake Light Switch

The brake light shall be activated only by a hydraulic pressure switch installed in the brake hydraulic lines. Each independent hydraulic brake circuit must be equipped with a hydraulic pressure switch. Cutting brakes are required to activate the brake light by way of a hydraulic pressure switch.

Note: Mechanical switches, push or pull, are explicitly prohibited.

B.10.4.2 - Reverse Light

Vehicles with a reverse gear shall be equipped with a reverse light. The reverse light shall illuminate when the vehicle is shifted to reverse gear and is extinguished when the vehicle is shifted out of reverse gear.

B.10.4.2.1 - Specification

Reverse lights shall be marked with an SAE R on the lens of the reverse light and be of LED design, equal to or exceeding the SAE standard J759.

B.10.4.2.2 - Location and Orientation

The reverse light shall have a resilient and durable mount and be positioned at a minimum of 700 mm (27.6 in.) above the ground. The reverse light shall be oriented to be visible to trailing vehicles and shine generally parallel to the ground.

B.10.4.3 - Reverse Alarm

Vehicles with a reverse gear shall be equipped with an audible reverse alarm. The reverse alarm shall sound when the vehicle is shifted to reverse gear and silenced when the vehicle is shifted out of reverse gear.

B.10.4.3.1 - Specification

Required reverse alarms shall be rated to meet the SAE standard J1741 or J994.

B.10.4.3.2 - Location

Required reverse alarms shall be mounted to the vehicle frame aft of the plane of the RRH.

B.10.5 - Instrumentation

Vehicles may be equipped with instrumentation to provide operational or performance information to the driver. All vehicle instrumentation must be included in the cost report.

B.10.6 - Data Acquisition

Vehicles may be equipped with data acquisition (data logging) systems. Data acquisition systems providing live feedback to the driver or telemetry data to the team must be included in the cost report. Data acquisition systems not providing live data to the driver and/or telemetry data to the team may be excluded from the cost report.

B.10.7 - Communication Systems

Teams are permitted to use radio-frequency (RF) communications systems. Any team using RF systems shall comply with federal, state, and local regulations based on the location of the event. At no point may a teams RF systems cause harmful interference to the voice or data systems in service of competition officials or emergency responders.

B.10.7.1 - Voice

Vehicles are permitted to use RF voice communications systems. RF Voice communication systems and equipment may be excluded from the cost report.

B.10.7.2 - Data

Vehicles are permitted to use RF data communications systems. All RF data communications systems and associated equipment shall be included from in the cost report.