Standard Ignition SS-378 Starter Solenoid

Starter Solenoid for BMW Applications

Standard Ignition SS-378 is a 12-volt starter solenoid built for select BMW charging and starting systems. It uses a stud-and-blade terminal design with six terminals and a black and gold dichromate/plastic finish for direct replacement service on listed applications.

Key Features

• 12-volt starter solenoid for electrical starting system repair
• Stud and blade terminal type with male terminals
• Six-terminal layout for listed BMW starter applications
• Black and gold finish with dichromate and plastic construction
• Compact 2.4-inch overall length
• Three mounting holes for installation alignment
• Standard Ignition SS-378 replacement part number

Application Details

Compatible With BMW 325Ci, 325i, 325xi, 330Ci, 330i, 330xi, X3, Z4, 525i, 530i, Z3, 323Ci, 323i, 328Ci, 328i, 528i, 318ti, 323is, 328is, M3, 318i, 318is, 325is, 535i, M5, 735i, 735iL, 635CSi, 528e, 535is, M6, 325e, and 325es applications listed in the fitment data. Fits 2003-2006 BMW 325Ci, 330Ci, 330i, 330xi, 325i, 325xi, and X3 with Denso starter applications, plus additional BMW starter configurations from 1985-2006 shown in the vehicle fitment table. Standard Ignition SS-378 is also cross-referenced to 12411726039 and ST340 for the same application.

What This Part Helps Fix

• No-crank condition when the starter solenoid does not engage
• Intermittent starter engagement during key start
• Clicking at start-up with no engine rotation
• Electrical starting faults tied to worn solenoid contacts
• Starter circuit issues on listed BMW models

Installation Notes and Tips

Verify starter type and vehicle-specific notes before ordering, especially Denso and Bosch starter references shown in the fitment data. Confirm terminal layout, mounting hole alignment, and voltage requirements against the original unit. Some applications include notes such as Touring Package, Auto Headlights, or starter-drive and alternator-related references, so match the exact vehicle configuration before installation.

Quality Assurance

Standard Ignition supplies replacement electrical components for starting and charging system service. SS-378 is built to match the listed 12-volt BMW applications and the fitment data provided for accurate replacement selection.