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Hi,
26,27,28,29 should go to ground lug on the intake manifold. Wire #3 should go to the ECU for #1 cyl.. You have to set your meter to low range as the injector windings are 3-4 ohms and reading through them will look like a short to ground. . On the the higher range everything looks like a short. Check that the 26 wire is not broken at the gound point on the manifold. You should see a group of white wires there into one common round terminal lug. See this link for an overall view and schematic.
http://www.icbm.org/erkson/ttt/engine/fuel_injection/d-jet.html
Greg B.
1970 1800E
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