steve310 Posted July 3, 2007 Report Share Posted July 3, 2007 Directwire says green wire at the ECM, and there are about 5. Tested all of them and the only one that seems to have a chance of being right gives me about .5 volts when stopped, and just over 13 volts when moving. Theres almost no transition. Is that the right wire? Its the first time I'm wiring into a speed sensor so I'm not sure. It just seems like voltage should increase with speed. Thanks in advance... Quote Link to post Share on other sites
cntrylvr79 Posted July 3, 2007 Report Share Posted July 3, 2007 voltage doesn't increase with speed. The fequency increases with speed. Though what you tested sounds about right for an older gm truck. Quote Link to post Share on other sites
steve310 Posted July 3, 2007 Author Report Share Posted July 3, 2007 Thanks, just to be sure I"ll check the frequency tomorrow Quote Link to post Share on other sites
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