There are Two OEM Numbers Used Here. The First (104-226) Uses a 420 Ohm Resistor in the "R" Terminal. The Second (104-226A) Does Not (The Connector Hole is Empty - the Wire is Not Used). When Furnishing This Unit, it is Best to Use the Solenoid With the "R" Terminal Included, as it Can Be Used in Either Application. The Later S114-528 Looks the Same, But it Has a Different Style Plug Off the Solenoid. We Call This a 17196.