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Hella 008188021 Diesel Glow Plug Relay
HELLA Diesel Glow Plug Relay for Mercedes-Benz 300SD
Restore reliable glow plug control with this HELLA diesel glow plug relay, part number 008188021. It is built for 12-volt systems and uses an 11-pin connector layout with a 9-second pre-glow time, making it a direct OE-style solution for the 1985 Mercedes-Benz 300SD.
Genuine OE from HELLA means this relay follows the electrical and timing requirements needed for consistent cold-start operation in diesel applications. The 008188021 relay is specified without post-glow time and without external temperature measurement.
Key Features
- Brand: Hella
- Brand line: Genuine OE from HELLA
- Part number: 008188021
- Diesel glow plug relay for 12V electrical systems
- 11-pole design for the glow plug control unit
- Pre-glow time: 9 seconds
- Without post-glow time
- Without external temperature measurement
Product Details
This HELLA relay is used to manage glow plug activation in diesel engine starting systems. For Mercedes-Benz 300SD applications, the relay helps control the pre-glow cycle so the engine receives the correct electrical signal before startup. The 008188021 part number is also useful when searching for an OE replacement relay for a 1985 Mercedes-Benz 300SD glow plug system.
This part cross-references Febi-Bilstein 34524 and Four Seasons 20092 for the same application.
What It Helps Solve
- Hard starting during cold weather
- Glow plugs not receiving proper pre-glow command
- Intermittent diesel start-up behavior tied to relay failure
- Incorrect glow plug timing in the control circuit
- Electrical faults in the glow plug relay circuit
Installation Notes and Tips
Verify the connector count, voltage rating, and timing specification before installation. This relay is listed for the 1985 Mercedes-Benz 300SD with an 11-pin glow plug system, so match the vehicle’s existing control unit and wiring layout to the OE reference before replacement. Confirm the application uses no external temperature measurement and no post-glow function.
Quality Assurance
HELLA is known for OE-level electrical components used in critical vehicle systems, including engine management and relay control. The 008188021 relay is built to OE specifications for the listed Mercedes-Benz 300SD application.
| Brand | Hella |
|---|---|
| Part Number | 008188021 |
| Position | Genuine OE from HELLA |
| Number of Poles | 11 |
| Pre-Glow Time [sec.] | 9 |
| Rated Voltage [V] | 12 |
| Supplementary Article/Info 2 | Without post-glow time |
| Supplementary Article/Supplementary Info | Without external temperature measurement |
This part fits 1 vehicles. Search below:
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 1985 | Mercedes-Benz | 300SD | Base | N/A | Control Unit, Glow Plug System - 11-Pin Connector - Pre-Glow Time: 9sec. - without External Temperature Measurement; Genuine OE from HELLA |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.