An external electrical connector for connecting one or more components of a snowplow blade unit. The electrical connector includes two housing components that are securable together. Each housing component includes an interface end and a coupling end. The coupling ends of the two housing components are designed to be connect together to form an electrical connection. Each of the interface ends includes at least one electrical connection interface that is designed to form an electrical connection with at least one external snowplow blade component. The number of electrical connection interfaces on the interface side of the two housing components is greater than the number of electrical connection interfaces on the coupling end of the two housing components. One of the housings components is secured to a component of said snowplow blade unit. Protection caps and housing holders are used to protect the parts of the housings when the housings are disconnected from one another. The housing components also includes seals to protect the electrical connections formed with or between the housing components. The housing components include locking arrangements to secure the electrical connections formed with or between the housing components.