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Do-It-Yourself Retrofit Kit
A Ballast Resistor is now included to extend Coil Life. Also a Stainless Steel breaker plate is now included for ease of installation.

Diagram of Electronic Ignition

What is a Ballast Resistor and Why do I need one?



Tired of burned or corroded points, bad condensers, poor starting, idle speed too high--in general, an unreliable ignition system? The Delco and Prestolite distributors supplied with Atomic 4 engines have been the source of countless ignition problems due to the use a conventional breaker point system in a harsh marine environment. Until now, the only means of obtaining reliable operation was constant maintenance and plenty of spare parts.

Introducing the AT-4D and AT-4P Hi-Intensity Electronic Retrofit Kits from Indigo Electronics. These kits have been expressly engineered to upgrade Delco and Prestolite distributors on Atomic 4 engines.

At the heart of the system is a Crane Cams Optical Trigger (LED and Photo Transistor), Shutter, and Control Module which control the firing of the ignition coil, replacing the conventional breaker points and condenser. As there are no rubbing parts to wear or electrical contacts making and breaking, the dwell angle and timing never change once initially set. Ignition problems are gone forever with only sparkplugs requiring replacement as needed. Additionally, with the Optical Trigger design, the same higher voltage and more crisp spark is generated whether at cranking speed or 3000 RPM. This is especially beneficial when starting and idling, leading to faster, easier starting and reduced idle speed. Other features include:

  • Reduced sparkplug fouling
  • Precise timing and fixed dwell
  • Improved fuel economy
  • Smoother operation
  • Hassel-free sailing


A Complete Retrofit Package

Easy two-hour installation includes:

  • Step-by-step 11 page instructions with photographs
  • Electronic Ignition Module (Now with an LED for System Status and Troubleshooting)
  • Optical Trigger Assembly
  • High performance, High Reluctance Oil Filled Ignition Coil, 3.3 Ohms Resistance
  • Low Noise Sparkplug Wires
  • 1.0 Ohm, 50 Watt Ballast Resistor Kit
  • Distributor Cap and Rotor
  • Champion RJ12C Sparkplugs
  • Stainless Steel Fasteners
  • All wiring "lugged" for reliable installation
  • Tie wraps for a tidy installation
  • Stainless Steel centrifugal advance springs
  • Stainless Steel Breaker Plate .



Concerned about having an Emergency Backup?
We now provide a Stainless Steel Breaker Plate onto which
you mount the Indigo components and then keep a fresh set
of points and condenser set-up and ready to go on the original breaker plate.

How to distinguish a Delco distributor from a Prestolite? The Delco was applied after about 1969 and is easy to recognize as the distributor cap is held on with two (2) screws. The cap on the earlier Prestolite distributor is held on with two spring clips.

Call today for Credit Card orders or send check or money order:

Indigo Electronics, Inc.

105 Pipe Kiln Court
Williamsburg, VA 23185

Don't delay. You never knew sailing could be so much fun!
1-800-428-8569 toll free
or 757-593-8569



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