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Originally Posted by meangrean
Hi Carson ,yes you are correct that the first one is the fuel pump and the second is for the a/c, but those are not for the 86 560SL.
I looked it up on AllData and they are saying that the fuel pump relay is a smaller relay and this one is silver.
You are correct that that is the normal relay for the 126 and 124.
But I think the 107 has a different relay.
I wish I could post the pix from AllData so you could see
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Your AllData is mistaken, Mercedes hasn't used the silver cube relay to control the fuel pump for many years on the 107, the information I have is from current factory Mercedes information, and from personal experience.
The very week this was originally posted I had to troubleshoot a fuel supply issue, I had to bridge the fuel pump relay at pins 7 and 8 in order to bypass the relay and measure fuel pump amp draw.
I assure you that for the 1986 560SL the relay is the larger black relay which is Mercedes part number 003-545-01-05