jose93 Posted June 19, 2011 Share Posted June 19, 2011 (edited) so i just droped my engine back in to my 93, oil pressure light came on after driving it for a while. i look under the hood and see that there is nothing connected to the sending unit. i had some other people helpin me out on it, so i dont remeber where the connection came from. I can't find a loose wire anywhere, just don't get it. can anyone help me out and give me a better idea of where it should be coming from, the harness? the chassis? Edited June 19, 2011 by jose93 Link to comment Share on other sites More sharing options...
Kingman Posted June 19, 2011 Share Posted June 19, 2011 The sending unit wire comes from the bundle of starter wires, I believe it is yellow/black. Link to comment Share on other sites More sharing options...
jose93 Posted June 19, 2011 Author Share Posted June 19, 2011 (edited) thanks, I'll check that out, so if its cut somewhere and not hooked up to the sensor, maybye its grounding out somnewhere and thats why the lights coming on? Edited June 19, 2011 by jose93 Link to comment Share on other sites More sharing options...
Kingman Posted June 19, 2011 Share Posted June 19, 2011 (edited) The light will come on when the sending unit is unplugged, it is an open circuit. No resistance or "feedback" from the sending unit will trip the light. Plug it in and the light will shut off. If it's been cut or sheered off somehow, you may have to pull apart the starter harness and find the wire further back then extend it with a new plug. Pretty simple, really. Edited June 19, 2011 by Kingman Link to comment Share on other sites More sharing options...
sewebster Posted June 19, 2011 Share Posted June 19, 2011 (edited) The light will come on when the sending unit is unplugged, it is an open circuit. No resistance or "feedback" from the sending unit will trip the light. Plug it in and the light will shut off. If it's been cut or sheered off somehow, you may have to pull apart the starter harness and find the wire further back then extend it with a new plug. Pretty simple, really. I don't think this is true. My understanding is that the sender shorts out with no pressure. This connects the wire to the block (ground) and the light comes on. If you unplug the wire, the light is off, unless the wire accidentally contacts a ground nearby (pretty much anything). I don't think this is a good design, but... Also, the wire may be in an orange/red boot thing. Edited June 19, 2011 by sewebster Link to comment Share on other sites More sharing options...
Kingman Posted June 19, 2011 Share Posted June 19, 2011 Either way, it is unplugged and therefore the light is on. If he finds the wire and plugs it back in the light will go off. Link to comment Share on other sites More sharing options...
sewebster Posted June 19, 2011 Share Posted June 19, 2011 Either way, it is unplugged and therefore the light is on. If he finds the wire and plugs it back in the light will go off. Yup (as long as everything is working right!). Link to comment Share on other sites More sharing options...
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