Edmunds Answers

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  • avatar zaken1 10/04/10 12:08 am PST

    The first thing I would do is to go back under the vehicle and connect the plug that you found was off. This plug is probably all or at least part of the problem. It may take some searching to see where the plug connects; but if it connects to the transmission; disconnecting it will not only shut off power to the starter, but may also shut off power to the fuel system electronics. In that instance; when you jumped the starter; it still wouldn't restore power to whatever else is served by that plug. Also look carefully around underneath the truck and see whether there are any other loose or disconnected plugs.

    If reconnecting the plug does not solve the problem; I would also check all the fuses; both in the fuse block in the passenger compartment, and any fuses under the hood. If you can locate a list of circuits which each fuse serves (either in the owners manual or on the cover of the fuse block) once you find the fuses which protect either the fuel system or the starting system, try exchanging each one with a known good fuse of the same rating; sometimes a fuse can blow and still look good to the eye. In addition to the fuses; the starter relay could have failed. This is an inexpensive, plug in part; so it would be well worth replacing on the chance it is bad.

    On some vehicles; the oil pressure switch also shuts down the motor if the oil pressure fails or the switch is disconnected. I'm not certain whether this is the case on your truck; but it is likely, since your oil pressure switch has two terminals on it (which is not the usual configuration for oil pressure switches unless they also serve an additional function, such as an engine safety shutdown). So I would also investigate the plug and the wiring harness to the oil pressure switch.

    It is also necessary for the key to be in the "run" position when you jump the starter; in order for the motor to continue running after the power is removed from the jumper. If you now turn the key on, jump the starter, and find that the motor continues to run after the jump; this would mean that the problem is either in the starter relay, neutral safety switch, or ignition switch.

Answers

  • MrShift@Edmunds 10/03/10 8:17 pm PST

    It could be the neutral safety switch (I'm assuming this is an automatic transmission). You could just by-pass the switch with a jumper wire and see if that works.


    If not, then it sounds like your problem is in the ignition switch itself. You might poke around and look at various fuses and fusible links as well. I presume from your last post that you applied current to the starter relay so we know that works.


    Probably it won't stay running because you don't have power from the ignition switch to the glow plug circuit.

    If you need to reply, just click on "answer this question" below.

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  • zaken1 10/04/10 12:08 am PST

    The first thing I would do is to go back under the vehicle and connect the plug that you found was off. This plug is probably all or at least part of the problem. It may take some searching to see where the plug connects; but if it connects to the transmission; disconnecting it will not only shut off power to the starter, but may also shut off power to the fuel system electronics. In that instance; when you jumped the starter; it still wouldn't restore power to whatever else is served by that plug. Also look carefully around underneath the truck and see whether there are any other loose or disconnected plugs.

    If reconnecting the plug does not solve the problem; I would also check all the fuses; both in the fuse block in the passenger compartment, and any fuses under the hood. If you can locate a list of circuits which each fuse serves (either in the owners manual or on the cover of the fuse block) once you find the fuses which protect either the fuel system or the starting system, try exchanging each one with a known good fuse of the same rating; sometimes a fuse can blow and still look good to the eye. In addition to the fuses; the starter relay could have failed. This is an inexpensive, plug in part; so it would be well worth replacing on the chance it is bad.

    On some vehicles; the oil pressure switch also shuts down the motor if the oil pressure fails or the switch is disconnected. I'm not certain whether this is the case on your truck; but it is likely, since your oil pressure switch has two terminals on it (which is not the usual configuration for oil pressure switches unless they also serve an additional function, such as an engine safety shutdown). So I would also investigate the plug and the wiring harness to the oil pressure switch.

    It is also necessary for the key to be in the "run" position when you jump the starter; in order for the motor to continue running after the power is removed from the jumper. If you now turn the key on, jump the starter, and find that the motor continues to run after the jump; this would mean that the problem is either in the starter relay, neutral safety switch, or ignition switch.

  • chief5166 10/04/10 10:42 pm PST

    Thank you for your help, it was the plug to the transmission that goes to the reverse lights, go figure, and also from jumping wires, it blew the fuse in the passenger compartment, the 10am engine fuse, that wasnt blown before, all works now, Thank you again.....

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