Rulebook / Electrical System

Electrical System

Electrical system requirements applicable to all Ultra4 competition vehicles.

Section 2.17 • Common Vehicle Requirements

2.17.1 KILL SWITCH

  1. A brightly colored, highly visible, easily distinguishable, master kill switch must be located in the dashboard area of the vehicle and be clearly labeled.
  2. The master kill switch must be able to shut down the entire primary electrical system for the vehicle. The master kill switch must shut down the engine when in the off position.
  3. Winch power supply and low amp draw secondary electrical equipment which requires an uninterrupted power supply may circumvent this switch.
  4. It is highly recommended that heavy-duty marine-style battery disconnect switches, capable of carrying total vehicle current load (including winch) be used and wired so that the entire electrical system can be disabled with one switch.
  5. Kill switch should be accessible by all occupants in the vehicle.

2.17.2 IGNITION

  1. Each vehicle must have a positive action on/off ignition switch in. The switch must be labeled “ignition on/off” and be located within easy reach of the driver and from the outside of vehicle. All electric fuel pumps with independent switches must be labeled “fuel on/off” and be within easy reach of driver and from outside of vehicle. It is highly recommended that electric fuel pumps not be independently switched.

2.17.3 BATTERIES

  1. Batteries must be securely mounted with metal brackets, clamps, or in a manner that prevents displacement in a roll over.
  2. Batteries shall not be located in the occupants' compartment. Batteries shall be considered as being in the occupant’s compartment if there is no firewall between the battery and the occupants.
  3. All batteries shall be the sealed, non-spill type. Absorbed glass mat (AGM) or “gel cell” type batteries are highly recommended.

2.17.4 LIGHTS

  1. Working headlights are only required for events where any portion of the on- course event takes place between sunset and sunrise.
  2. All vehicles must have a minimum of two tail-lights, two brake lights and one rearward facing amber light. Stock tail-lights, if so equipped, are permitted as long as they remain on whenever the vehicle’s ignition is on.
  3. A rearward facing amber light must be installed on all vehicles.
  4. All rearward-facing lights must be protected against damage that may be caused by a rollover. Taillights must be at least 3” (75mm) in diameter or meet with Ultra4 approval, and must be mounted in such a manner as to be clearly visible from the rear of the vehicle.
  5. Rearward facing amber light, and blue light if so required, must illuminate with a brightness that is at least equivalent to a 40-watt 12V automotive lamp but not brighter than equivalent to a 55 watt 12V automotive lamp. LED lamps of appropriate brightness are permitted. The amber lens must be deep-coated amber in color, no other color is permitted. The blue lens must be medium- coated blue in color, no other color is permitted. The amber light and blue light, if so required, must be mounted a minimum of 48” (1220mm) from the ground and must be clearly visible, with no obstructions (i.e. not mounted behind any translucent object), from any position in an imaginary arc from the 5 o'clock position to the 7 o'clock position of the vehicle. The amber light and blue light, if so required, must be placed so as not to impair the vision of another driver approaching from the rear.
  6. All rearward-facing lights must be connected to the ignition switch or directly to a main battery power switch, such that they remain on whenever the vehicle’s ignition is on.
  7. If during an event any required light fails to operate, the light must be fixed or replaced at the next available pit before the vehicle can continue in the event.

2.17.5 STARTER

  1. All vehicles must be self-starting by use of an onboard electric starter.
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