dover Posted May 28, 2012 Share Posted May 28, 2012 I'm trying to cifer the wiring circus in the engine compartment related to the fuel shut off on the PT pump. I have one wire hooked to the pump that goes to the alternator. Along the line it is stripped of insulation and has another wire "wrapped" around it for a splice and going inside the cab under the dash(I'm assuming to the key switch). There is another terminal on the fuel soleniod that doesn't have anything hooked to it. Does this thing ground internally through the case and I just need to supply it with 12v?Thank you,Ben Quote 1962 B733 L cab Link to comment https://www.bigmacktrucks.com/topic/25333-cummins-pt-fuel-shut-off/ Share on other sites More sharing options...
BOB DINGSDALE Posted May 29, 2012 Share Posted May 29, 2012 should only be one wire to it from ing key.is it 12 or 24volt solinoid and is it in manual or auto .thumb screw in front of solinoid. Quote Link to comment https://www.bigmacktrucks.com/topic/25333-cummins-pt-fuel-shut-off/#findComment-121487 Share on other sites More sharing options...
dover Posted May 30, 2012 Author Share Posted May 30, 2012 It is 12v. There is no mechanical linkage and I do not remember a thumb screw on the front. Quote 1962 B733 L cab Link to comment https://www.bigmacktrucks.com/topic/25333-cummins-pt-fuel-shut-off/#findComment-121692 Share on other sites More sharing options...
KidNV Posted May 30, 2012 Share Posted May 30, 2012 Dover, it should only have 1 12v wire from the switched side of the key, like Bob said. Someone probably broke the wire from the switch and was too lazy to pull the switch and replace it, or could figure it out so just tied another hot wire to it. Either way.. fix as described. There is a thumbscrew facing the fan, to manually override it when they fail. btw, make sure you dont hook it to the ACCessory side of the switch, or it will be on when it shouldnt, and burn out earlier... Quote Link to comment https://www.bigmacktrucks.com/topic/25333-cummins-pt-fuel-shut-off/#findComment-121695 Share on other sites More sharing options...
dover Posted May 30, 2012 Author Share Posted May 30, 2012 My assumption was a single hot from the key, but the presence of a SP switch and positive ground has boggled my mind, and I am fairly confortable with 12v electronics.Thank you both for your help,Ben Quote 1962 B733 L cab Link to comment https://www.bigmacktrucks.com/topic/25333-cummins-pt-fuel-shut-off/#findComment-121698 Share on other sites More sharing options...
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