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Roadster-18 Base Wiring Kit

Starting at: $234.00

Item No: RDSTER-18-R

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Best suited for:

Kit Cars
Muscle Cars

If you're upgrading or retrofitting an earlier installation you may be able to save money by ordering just the components you need. Start with this Base Kit and select, al a carte, just the wire and connectors you need. The Base Kit includes the same Power Center and laminated wiring diagram as our complete kit but does not include all the wire and connector kits that add significantly to the cost. Upgrading or retrofitting an older installation is recommended only for professional and experienced installers.

The Roadster-18 kit is available in both a standard and long version, depending on where the Power Center is mounted. Under the dash is considered the standard location and for these applications the Standard Wire Length version should be long enough. The Long Wire Length version is recommended when the Power Center is to be mounted anywhere else in the car (under the front seat, in the trunk, etc). Longer wires may also be necessary when special routing is required for concealment (for example, through frame rails). Select the appropriate version for your application when placing your order.

Similar to our Coupe-23, the Roadster-18 is a high quality yet compact kit designed especially for open air cars that don't have power windows, power door locks, 4 beam headlight systems, or a lot of electrical accessories. The heart of our kit is the Roadster Power Center, distributing power through 9 relays and 14 fuses to 18 circuits. This means more power to your system for easier starting, brighter headlights, and many years of trouble-free operation.

Relays offer an efficient and reliable means of switching high currents with minimal power loss. Auto manufacturers and professional car builders recognize this and have been using relays instead of bulky switches to improve the quality and reliability of automotive electrical systems for decades. The Power Center utilizes high quality relays to distribute power to various vehicle loads. This means no more time-consuming mounting and wiring add-on relays. The heavy duty ignition and headlight switches required by other manufacturers are not necessary with this kit. Even daytime running lights are provided as a standard safety feature!

Image of Power Center included with each Wiring Kit












The Roadster Power Center ... Key features:

  • Modern, high quality, and efficient design raises the bar for after-market universal wiring systems.
  • 18 fuse-protected circuits
  • 14 fuses
  • 9 board-mounted relays
  • Compatible with Distributor and Fuel Pump or EFI/ECU ignition and fuel systems
  • Daytime Running Lights - standard!
  • Conventional (switched) headlights if you don't want daytime running lights
  • Use your own Ignition, Headlight, and Dimmer switches - a wide variety of switches can be used with this kit
  • This kit is limited to 2 headlights, if you have 4 headlights you will need the the Coupe-23 kit.
  • Car builders and designers!! - large heavy duty high-amperage Ignition, Headlight, and Dimmer switches are not required. Small, easy-to-mount switches can be used just as easily to control the Power Center's on-board relays for all high current circuits.
  • Dedicated 40 amp relay with thermostatic control input, compatible with all known electric radiator fans on the market, up to 30 amps continuous running current and 70 amps startup (inrush) current.
  • Alternator Exciter circuit, compatible with GM "SI" series alternators
  • 20 amp Accessory circuit for a Radio, Power Point, Wipers, etc.
  • Power Feed and Loads are connected to the Power Center through heavy duty stud terminals for simple, bullet-proof connections
  • Rated for 100 amps continuous total load, about twice what most street rods require
  • Most cars will not require any additional relays
  • Reverse battery protected
  • Compact size: 6-1/4" x 5" x 2 1/2" (LxWxH) makes mounting easy
  • Mounting base and cover are powder-coated satin black.


Image of 17x22 Full Color Wiring Diagram included with each Wire Kit














Circuits available through the Power Center:

  • Ignition / Coil
  • Fuel Pump / EFI System
  • Alternator Exciter
  • Gauges and Electric Choke
  • A/C and Heater System
  • Headlamps (60/55W max)
  • Accessory (20 amp)
  • Radiator Fan (up to 30 amps continuous)
  • Turn Signals
  • Brakes
  • Hazard Flashers
  • Parking Lamps
  • Starter Solenoid
  • Horn
  • Clock / Dome lights
  • Battery Power to Switches and EFI System


The Complete Roadster Kit ... what’s included:

  • 100A Power Center, 18 circuits, 14 fuses, 9 relays
  • Power wires for Alternator and Power Center. Cross-linked insulation is rated for 125 deg C (257 deg F), meets SAE J-1128 specification for automotive use.
  • Two 100A LMI fuses and fuse holders, one protects the Power Center, the other protects the Battery and Alternator
  • Large 18x24, Double-Sided, Laminated, Color Wiring Diagram
  • Alternator kit compatible with 1-wire alternators
  • Terminals, Wire ties, and heatshrink tubing

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