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fuel pump relay--EDIT w/Graphic from Wiring Diagram PDF 900 1995

uid 27's pic
posted by  Art Benstein on  Wed Apr 20 08:54 CST 2011
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last visit: Fri Oct 17 20:10 CST 2014
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That is very helpful. It lends credence to Bob's theory one has diode protection and the other does not.

You would be able to tell for sure by opening it and looking. But if you didn't want to do that, I think an ohmmeter, on the RX1 scale should show a difference when swapping polarity of the probes on the coil of the protected unit. The "I think" part depends on my recollection these relays have coil resistances exceeding what the diode would read in forward bias.

Either relay would work, but of course the one with the diode would afford flyback protection to the ECU circuit driving it. All of the Bosch ECU's I've looked at in Volvos internally include that diode protection, but it never hurts to have more. In that respect, the green one might be better.
--
Art Benstein near Baltimore


Don't be irreplaceable. If you can't be replaced, you can't be promoted.






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