fuel pump relay

1987 MERCEDES BENZ 560SEL

18,000 MILES • V8 • 2WD • AUTOMATIC

AMST1

MEMBER
1 POST

car would not start but it would start when I jiggled the relay while someone started the car. I bought a new one the car still did not start. Any suggestions 'would be appreciated Thank you.

Jul 12, 2009 at 11:19 PM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

It sounds like the issue might be the relay connector. If the connector where the relay plugs in has loose wire or have corrosion build up it can have intermittent connection or weak connection.
Since you are able to move the relay and start it, that is likely the issue.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check for any corrosion or burn connector. Sometimes part of the connector can be burnt and crease this type of issues.

I have attached the testing procedure for the relay below.

Please let me know of any questions.
Thank you.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Nov 18, 2021 at 4:13 AM