Mercedes Sprinter Multi-Purpose Relay 12V 50A – Hella | All Generations | #0035421619 / 0025422619

A failing relay in a Mercedes Sprinter creates an electrical fault that can look like almost anything — a component that won't activate, an accessory that works intermittently, or a circuit that's completely dead despite confirmed voltage at the fuse. This is the Hella 12V 50A multi-purpose relay for Mercedes-Benz Sprinter vans, a direct plug-in replacement used across multiple electrical circuits and model years to restore reliable switching wherever this relay is specified.

What This Part Does

The relay is an electromechanical switch that allows a low-current control circuit — typically from an ECU, switch, or control module — to switch a high-current load circuit on and off without routing that high current through the control switch itself. When energized by the control circuit, the relay's internal electromagnet closes a set of contacts that completes the load circuit, powering whatever component the relay controls. At 50 amps and 12V, this relay is rated for significant current loads — making it suitable for high-draw circuits including cooling fans, fuel pumps, glow plug modules, auxiliary heaters, and accessory circuits throughout the Sprinter's electrical system. When the relay's internal contacts pit, weld closed, or its coil loses resistance, the controlled circuit either stays permanently off, stays permanently on, or switches intermittently.

Common Symptoms of a Failing Relay

• Component controlled by the relay not activating at all — contacts failed open
• Component staying on continuously when it should cycle off — contacts welded closed
• Intermittent operation of the controlled circuit that clears when the relay is tapped or reseated
• Multiple resets or fault codes clearing briefly then returning — relay cycling under load
• Clicking sound from the relay under operating conditions without the controlled circuit activating

When to Replace

Replace when the relay is confirmed failed by swapping with a known-good relay of the same specification, or when the relay tests outside its rated coil resistance. Always identify the specific circuit the relay controls before replacement — this relay is used in multiple positions across the Sprinter's fuse and relay box.

Fitment

• 2001–2006 Mercedes-Benz / Dodge Sprinter (T1N) – Multiple electrical circuits
• 2007–2018 Mercedes-Benz / Dodge / Freightliner Sprinter (NCV3) – Multiple electrical circuits
• 2019+ Mercedes-Benz Sprinter (VS30) – Multiple electrical circuits

✔ 12V / 50A / 5-pin plug-in relay
✔ Always identify the specific circuit position before ordering — verify by VIN and circuit application

Part Numbers

• Mercedes OEM: 0035421619 / A0035421619 / 003-542-16-19
• Cross-reference: 0025422619 / A0025422619 / 002-542-26-19
• Manufacturer: Hella — 007793031
• SKU: 0035421619