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Fuel pump relay: a puzzle 140-160 1972

posted by  Chris Mullet on  Fri May 7 02:04 CST 2004
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last visit: Fri Oct 24 09:08 CST 2014
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I just looked at my 73 1800ES (same system). One is a Bosch 10A P/N 0 332 003 021. The other is a Bosch 10A 0 332 003 025, and has a large blue dot on it. The pins appear to be numbered identically. My Haynes manual says that the "Main" relay (that feeds power to the computer) is the one with the blue dot, and the other powers the fuel pump. The differnce is that the main relay (blue dot) has a diode inside that protects the computer in the event you accidentally connect the battery terminals in reverse.

I know the P/N's and amperages I have don't match your's, but take it all for what it's worth.

BTW - if the computer doesn't sense impulses from the trigger points, it will not allow power to the fuel pump relay relay deyond the intitial 1 or 2 second shot it gets when you first turn the ignition on. So power to the fuel pump will only be momentary (at best) if the main relay is bad.

Good luck.






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