atl_adam Posted April 29, 2013 Share Posted April 29, 2013 So I've got an electrical issue that I can't seem to figure out. Backstory: my car is a 77 280z that has 55k original miles. The wiring harness was shot so I replaced it with a '76 wiring harness with all new connectors, etc and now I'm not getting a grounding pulse to the injectors (everything worked fine before the '77 harness was taken out, it just needed to be refreshed). I've got 12v at both injector connectors, I did a continuity test at pin 5, 16, 17, and 35 but still don't have an injector pulse. I've checked the chassis ground and everything looks good. What next? Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 29, 2013 Share Posted April 29, 2013 Check continuity from Pin 1 to the negative post of the coil. That's what the ECU uses to determine when to ground the injectors. Quote Link to comment Share on other sites More sharing options...
atl_adam Posted April 29, 2013 Author Share Posted April 29, 2013 Getting no reading at pin 1 from the negative coil post/blue wire Quote Link to comment Share on other sites More sharing options...
atl_adam Posted April 29, 2013 Author Share Posted April 29, 2013 Getting no reading at pin 1 from the negative coil post/blue wire Quote Link to comment Share on other sites More sharing options...
col10see Posted April 30, 2013 Share Posted April 30, 2013 Did you reconect the ground in the harness at the manifold or is it possible the manifolds contact to ground is dirty? Quote Link to comment Share on other sites More sharing options...
4.6StangRage Posted May 1, 2013 Share Posted May 1, 2013 There is a connector difference between the two harnesses. I did the exact opposite. I have a '76 in which I installed a '77 harness on to. The difference is a connector right under the passenger side of the dash which sends the pulse to the ECU for the injectors. In your case you will have a stray wire which will needed to be adapted into a plug that has 5 pins. I am positive that is your issue, you might want to compare differences in the harnesses. Quote Link to comment Share on other sites More sharing options...
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