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Subject:Testing a Fuel Injection harness??
From:Tom Young
Date:Thu, 5 Oct 2006 15:09:51 -0700

Hi all:

I got a fuel injection harness to replace the one that was destroyed in an
engine fire.  (Air-cooled Federal Vanagon.)  I figured I'd do some testing
of the harness before going any further with it, but I'm stumped right at
the get-go and I'm wondering if there's something here I don't understand.

I first tested the wire that connects to the ignition coil; a continuity
tester (test light and a battery) attached to the wire's spade connector at
one end and terminal 1 of the big black ECU connector (as indicated in the
wiring diagram) at the other end lit up.  Cool!  It's a good wire.

I then went on to test the 4 fuel injection connectors and here's where I
got stumped.  Looking at the wiring diagram, one of the two wires at each
fuel injector connector runs to a terminal in the ECU connector and the
other wire runs to the white plug that attaches to the right side of the
dual relay.  In each case I registered continuity between one terminal of
the connector and the appropriate terminal in the ECU connector.  But, when
I went to do the test with the other wire in each of the fuel injection
connectors I got no indication of continuity at the white dual relay plug.

The harness certainly *looks* OK and it's only an overabundance of caution
that persuaded me to test it in the first place.  According to my reading of
the wiring diagram I should be showing continuity between the FI connectors
and the white dual relay plug, but I'm not.  Do I have a bad harness here,
or am I missing something in my reading of the diagram?

TIA.
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Tom Young
Lafayette, CA 94549
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