Mercedes Relay Green 12V 1268203039 Bosch 601648 W126 500SEL 560SEC S-Class
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Genuine Bosch control relay (green, 12 V) for the Mercedes S-Class W126 and the C126 SEC coupé, part number 126 820 30 39.
Genuine Bosch manufacture with Mercedes star · Professionally refurbished and tested · Fits W126 & C126
✓ Function tested
Condition of this part
Professionally refurbished, tested and fully operational.
Function and location
Green Bosch control relay, 12 V. According to the source, it is used in the W126 S-Class for one of the comfort or safety circuits, for example automatic climate control, seat adjustment, or lighting control. Genuine Bosch manufacture with Mercedes star.
Located in the relay box in the interior, depending on the model series either behind the passenger footwell or under the dashboard.
Used part or refurbished part?
| Standard used part | This refurbished part |
|---|---|
| Age unknown, fitted untested | Professionally refurbished and function-tested |
Compatible vehicles
W126 S-Class sedan (1979–1991):
- 260 SE (126.020)
- 300 SE / 300 SEL (126.024/025)
- 380 SE / 380 SEL (126.032/033)
- 420 SE / 420 SEL (126.034/035)
- 500 SE / 500 SEL (126.036/037)
- 560 SE / 560 SEL (126.038/039)
C126 SEC coupé (1981–1991):
- 380 SEC / 420 SEC / 500 SEC / 560 SEC
Part numbers: Mercedes part number 126 820 30 39, Bosch number 601648.
⚠ Important: compare the part number before buying
The exact Mercedes part number 126 820 30 39 is crucial. There are many green Bosch relays with a similar housing but different circuits. Please compare the number of your old relay 1:1.
Does not fit:
- W123, W201 and W124 – a different relay system there
- W116 and R107 (predecessor model series)
- USA/Canada versions with different electronics
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 exact function is this relay responsible for?
According to the source, this green 12 V relay is used in the W126 series for one of the comfort or safety circuits, for example automatic climate control, seat adjustment, or lighting control. We do not have a more precise assignment – so please be sure to compare part number 126 820 30 39 with your old relay.
Is the relay tested?
Yes, it has been professionally refurbished, function-tested and is fully operational.
Can I return the part if it doesn't fit?
Yes, a 60-day return policy applies, with free shipping within Germany.
Related categories: Relays, W126
KFZTeile-Thot specialises in spare parts for Mercedes classic cars. Free shipping within Germany, 60-day return policy.
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