Ballast Resistor Information
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:
A Complete Retrofit Package
Easy two-hour installation
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.