DDEC III
In 1992 the DDEC III system was introduced and was available in horsepower ratings up to 470 hp (350 kW), and this was due to revised camshaft timing, and other improvements. Again, a "cruise power" option was available, and the standard rating was 430 hp (320 kW), and when the cruise control was engaged the horsepower rating was increased to 470 hp. Again, encouraging operators to take advantage of reduced fuel consumption.
The DDECIII system also introduced dual voltage(12V/24V) ECM's. Previous DDEC ECM's had been 12volt only. The dual voltage ECM's made installation into 24volt marine, industrial, and non USA trucks much easier. The use of Battery Charge Equalizers(Vanner) was not required as the ECM could now be connected directly to the 24volt batteries.
The DDECIII ECM was thinner than the DDECII ECM, and had wiring connectors at both ends. The front end had two five pin connectors for the injectors, and a thirty pin connector for the engine sensors. The rear end had a five pin Power Connector, six pin Communications Connector, and a thirty pin Vehicle Interface Harness Connector.
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