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Bosch SR7521N Starter
| Brand | Bosch SR7521N |
|---|---|
| Voltage | 12 |
| Power Rating | 1.4 |
| Mounting Bolt Hole Quantity | 2 |
| Nose Cone Material | Aluminum |
| Nose Cone Type | Closed nose |
| Starter Rotation | Clockwise |
| Mounting Hardware Included | No |
| Mounting Shims Included | No |
| Solenoid Attached | Yes |
| Tooth Quantity | 10 |
| New Or Remanufactured | New |
| Original Equipment Manufacturer Names | Bo |
| Starter Finish | Aluminum |
| Product line | Starter (New) |
| Fits | Ford and Mazda · 29 vehicles |
New starter. Built and tested for dependable performance and reliability.
Aluminum nose cone. Lightweight construction with a closed-nose design.
Solenoid attached. Ready for a cleaner, more complete starter assembly.
Cross-references FOTZ11002B and ZZL118400 for the same application. See all 2.
Bosch SR7521N Starter for Ford and Mazda
The Bosch SR7521N is a new 12-volt starter built for dependable engine cranking in select Ford and Mazda applications. It is a direct replacement starter for vehicles including the Ford Ranger, Ford Explorer, Ford Aerostar, Mazda B4000, and Mazda Navajo.
Key Features
- 12-volt starter with a 1.4 power rating
- Clockwise starter rotation
- 10-tooth drive gear
- Solenoid attached for streamlined replacement
- Aluminum nose cone and aluminum finish
- Closed nose design with 2 mounting bolt holes
- New starter, not remanufactured
Product Details
Bosch Starter (New) line components are engineered for performance and reliability, and the SR7521N follows that approach with a new-build design, integrated solenoid, and durable aluminum construction. This Bosch SR7521N starter is listed for 1990-1996 Ford Aerostar, 1991-1996 Ford Explorer, 1990-1996 Ford Ranger, 1991-1994 Mazda Navajo, 1994-1997 Mazda B4000, and 1990 Ford Probe from 01/1990. This part cross-references Ford OE applications (e.g., FOTZ11002B, ZZL118400) for the same application.
Common Problems This Starter Can Address
- Engine no-crank condition when the starter motor has failed
- Slow or inconsistent cranking during ignition
- Clicking at start-up caused by worn starter internals
- Intermittent starting issues related to solenoid wear
- Starter replacement needs on high-mileage Ford Ranger, Explorer, Aerostar, Mazda B4000, or Mazda Navajo vehicles
Installation Notes and Tips
Verify the vehicle year, engine configuration, and starter mounting style before installation. This starter uses 2 mounting bolt holes, a closed nose aluminum housing, clockwise rotation, and an attached solenoid, so confirm the original unit matches these specifications. Mounting hardware and shims are not included, and proper alignment should be checked during installation to ensure correct engagement with the flywheel or flexplate.
Quality Assurance
Bosch manufactures this starter as a new electrical replacement component and tests it for performance and reliability before release.
| Year | Make | Model | Transmission | Liters | Cylinders | Notes |
|---|---|---|---|---|---|---|
| 1997 | Mazda | B4000 | Automatic | 4.0L | V6 | Starter (New) |
| 1996 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1996 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1996 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1996 | Mazda | B4000 | Automatic | 4.0L | V6 | Starter (New) |
| 1995 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1995 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1995 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1995 | Mazda | B4000 | Automatic | 4.0L | V6 | Starter (New) |
| 1994 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1994 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1994 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1994 | Mazda | B4000 | Automatic | 4.0L | V6 | Starter (New) |
| 1994 | Mazda | Navajo | Automatic | 4.0L | V6 | Starter (New) |
| 1993 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1993 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1993 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1993 | Mazda | Navajo | Automatic | 4.0L | V6 | Starter (New) |
| 1992 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1992 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1992 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1992 | Mazda | Navajo | Automatic | 4.0L | V6 | Starter (New) |
| 1991 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1991 | Ford | Explorer | Automatic | 4.0L | V6 | Starter (New) |
| 1991 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
| 1991 | Mazda | Navajo | Automatic | 4.0L | V6 | Starter (New) |
| 1990 | Ford | Aerostar | — | 4.0L | V6 | Starter (New) |
| 1990 | Ford | Probe | — | 2.2L | L4 | From 01/1990; Starter (New) |
| 1990 | Ford | Ranger | Automatic | 4.0L | V6 | Starter (New) |
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