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Injector Polarity

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Old Feb 23, 2008 | 12:20 AM
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Default Injector Polarity
Can anyone tell me which pin on the injector is positive? I don't see a + on it. How can I tell which side is positive?
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Old Feb 23, 2008 | 12:45 AM
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Originally Posted by ProgGod
Can anyone tell me which pin on the injector is positive? I don't see a + on it. How can I tell which side is positive?
There isn't. Either one can you used as positive or negative. Makes no difference.
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Old Feb 23, 2008 | 12:48 AM
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Does for me since I am wiring in traction control. However it occured to me I can use an OHM meter to check which wire is the common ground to tell the difference

I will try that.
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Old Feb 23, 2008 | 12:59 AM
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Originally Posted by ProgGod
Does for me since I am wiring in traction control. However it occured to me I can use an OHM meter to check which wire is the common ground to tell the difference

I will try that.
Yes, the WIRES will be different, but what I'm saying is that it doesn't matter what pin on the injector you put the + to and the - to. It works either way.
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Old Feb 23, 2008 | 01:16 AM
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Originally Posted by Zteve
Yes, the WIRES will be different, but what I'm saying is that it doesn't matter what pin on the injector you put the + to and the - to. It works either way.
Well I need to cut into the positive lead and jumper inbetween Thats why i needed to know. Right now the person that did the wiring actually wired into the wrong wires, which is why it hasn't been working. Anyhow hooked a OHM meter up, check continuity, figured out the one closest to the tab is the common ground. Now I just need to splice into all these wires.
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Old Feb 23, 2008 | 05:58 AM
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They use a common positive. Ground (return) is supplied by the ECM.

Crank/Run power positive on *most* GM wiring is a Pink/Black stripe wire so all 8 injectors should have a pink/black striped wire.
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Old Feb 23, 2008 | 10:22 AM
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Originally Posted by EC_Tune
They use a common positive. Ground (return) is supplied by the ECM.

Crank/Run power positive on *most* GM wiring is a Pink/Black stripe wire so all 8 injectors should have a pink/black striped wire.
The problem is the shop that did my car redid all the wiring. So all the colors are mismatched. Figured it out regardless. The wiring is such a mess I think i am going to redo alot of the harness.
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Old Feb 23, 2008 | 10:28 AM
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What did they do to change all that wiring? Did they change the injector harness conectors and the wires going to them? I am curious.
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Old Feb 23, 2008 | 11:59 AM
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Injectors share a common +12V supply as stated in a previous post. Use an ohm meter as discussed here to find the common supply wire:

click here to view instructions (pdf format)
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Old Feb 23, 2008 | 01:36 PM
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Originally Posted by don7790
What did they do to change all that wiring? Did they change the injector harness conectors and the wires going to them? I am curious.
No idea why its changed They seemed to cut all the injectors from the wires and then resplice them. They swapped out from an LS2 to an LS7, but not sure why that would need injector wires cut.
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Old Feb 23, 2008 | 04:57 PM
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Originally Posted by ProgGod
No idea why its changed They seemed to cut all the injectors from the wires and then resplice them. They swapped out from an LS2 to an LS7, but not sure why that would need injector wires cut.
I see. By the way use a high resistance test light to tell which one is the positive.
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Old Feb 23, 2008 | 06:03 PM
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Originally Posted by don7790
I see. By the way use a high resistance test light to tell which one is the positive.
Ya it was eaiser then that, just had to find the common wires.. thats the ground!
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Old Feb 23, 2008 | 06:28 PM
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It sounds like you need professional help, not a bunch of guys on a forum.
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Old Feb 23, 2008 | 07:09 PM
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Originally Posted by timd38
It sounds like you need professional help, not a bunch of guys on a forum.
Traction control is in, working great. Thanks for everyones help!
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