Mercedes Hella relay blue 12V 30A 0015427591 Hella 099856 W124 W126 W201
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Hella control relay 12V/30A in blue aluminum housing, part number 0015427591 (Hella 099856) – for Mercedes W123, W126, W201, W124, R107 & R129.
Professionally refurbished · Function-tested · For high-current loads such as fuel pump & main fan
✓ Function tested
Condition of this part
The relay was professionally refurbished, function-tested, and is fully operational.
Function and location
This Hella control relay with 12V/30A is a standard switching relay for high-current loads such as fuel pump, main fan, or horn. It operates with the 30 / 85 / 86 / 87 wiring diagram (changeover contact).
The installation location is the relay box in the interior, behind the passenger footwell or under the dashboard, depending on the model series.
Used part or refurbished part?
| Standard used part | This refurbished part |
|---|---|
| Age unknown, fitted untested | Professionally refurbished and function-tested |
How can you tell a relay is faulty?
- The fuel pump no longer switches on, the vehicle doesn't start or starts poorly
- The main fan no longer starts up, the engine tends to overheat
- The horn stays silent or only works sporadically
Compatible vehicles
W123 (1976–1986): Sedan, estate (S123), coupé (C123)
W126 S-Class (1979–1991): Sedan and SEC coupé C126
W201 190 series (1982–1993): all variants
W124 E-Class (1984–1995): Pre-facelift II: 200 E / 230 E / 260 E / 300 E / 300 D / 300 TE / 300 CE / 500 E. Post-facelift II: E 200 / E 220 / E 280 / E 320 / E 420 / E 500
R107 SL/SLC (1971–1989): 280 SL to 560 SL
R129 SL roadster (1989–2001): 300 SL / 500 SL / SL 280 / SL 320 / SL 500 / SL 600
The Mercedes part number of this relay is 0015427591, the corresponding Hella number is 099856. It belongs to the Hella size range 001 542, under which further 12V/30A relays with different wiring diagrams and end numbers are offered.
⚠ Important: compare the part number before buying
The exact end number 0015427591 is critical. Hella sells various 12V/30A relays of the 001 542 size range with different wiring diagrams (normally-open 87, changeover 87/87a) and Mercedes end numbers. Please compare your old relay's number 1:1.
Does not fit:
- Relays with other current ratings (10A, 15A, 40A)
- Relays with changeover contact 87a (different pinout)
- USA/Canada versions with different wiring
Does this part fit your car? Send us the VIN (chassis number) and model year – we'll check it for free: 0179 8991069 (Mon–Fri 8 am–6 pm) or via our contact form.
FAQ
What's included in the scope of delivery?
The exact scope of delivery is shown in the product photos.
How does this relay differ from similar versions?
The exact end number 0015427591 is critical. Hella offers further relays in the 001 542 size range with different wiring diagrams (e.g. normally-open 87 instead of changeover 87/87a) – please compare with the old part before buying.
Can I return the part if it doesn't fit?
Yes, a 60-day return policy and free shipping within Germany apply.
Related categories: Relays, W201, W124 & W126
KFZTeile-Thot specialises in spare parts for Mercedes classic cars. Free shipping within Germany, 60-day return policy.
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