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Old 07-07-2003, 06:10 PM
Registered User
Join Date: May 2003
Location: Rockville, MD
Posts: 96
420SEL ('87) Need Relay Legend/Diagram

Hi all,

In my fuse box (420SEL) I have six silver colored relays, all with identical markings. Can anyone tell me what relay controls what? To make this easy, I've attached a photo with the relays numbered. Any help would be greatly appreciated.



87 420SEL
00 C230K
00 A4 2.8Q
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420SEL ('87) Need Relay Legend/Diagram-relays.jpg  
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Old 07-07-2003, 06:58 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,123
Best guesses based on the W126 CD manual

1 - aux fan high speed relay
2 - aux fan low speed relay
3 - air pump clutch relay
4 - headlight wiper/washer relay
5 - power window relay
6 - not sure if power seat fuses or power window relay (I think the CD manual is mislabeled)

95 S420
91 300SE
87 300SDL
83 300SD
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Old 07-07-2003, 07:03 PM
Registered User
Join Date: May 2003
Location: Rockville, MD
Posts: 96

Sixto, once again, you da man! Thanks.

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