Thread: fuel pump relay
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Old 01-22-2008, 12:29 PM
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865sp300e 865sp300e is offline
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Quote:
Originally Posted by Carson357 View Post
usually will be circuit 15 if you mean ignition switch,

here is a link to an article that may help understand mercedes wiring

https://www.mbwholesaleparts.com/StarTuned/pdfs/Info07JuneST.pdf
That is correct, circuit 15 (pin #9) is the power input. If you wish to test the fuel pumps bridge relay circuits 30 (pin #8) and 87 (pin #7) which will send direct power to the pumps.
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