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You should check it first just to make sure. Usually it is ground but you never know. You can use a continuity tester, or a light bulb, or a test light. Make sure key is turned on and coil is hooked up when checking. There should be a harness on the end of your wires that only allows you to connect it one way.

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Q: Is the green wire positive or negative to the ignition module of a 91 Chevy Suburban 5.7 liter?
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