Question about Chevrolet Cavalier

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The circuits normally powered when i turn key are not.please help

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  • wispbear May 21, 2011

    good morning thanks for responding so quick.all fuses & links are good i tried new switch but made no difference.dash is dead, acc position gets radio but dead in run & start.i pulled plugs out of switch & probed with meter.upper black plug left to right, brown 0v,red 12v,red 12v & a smaller black wire below these three which appears to be grounded.bottom white plug i probed with wire i connected to + post of battery.left to right the response was,purple =dash lit up &gauges worked,orange =relays clicked radio on.yellow=motor cranks over,there is also a smaller green wire.could you please tell me what these wires do &what is going on thanks

  • wispbear May 21, 2011

    im sorry i thougut you had that info.2000 cavalier 2.2l ,4 door.forgot to mention i also jumped black plug wires,brown,red,pink to white plug wires purple,orange,yellow with no effect even though red & pink show 12v they seem to have no power.im going downstairs to car & try & locate power lead that feeds switch, be back in few min.hope you can tell or show me what these wires are & do.my wife & i are old & retired & need to be in contry on a beautiful sunny day like this.not here in midland ont. can.i know YOU can help us to get there. thanks so much for your help! is it sunny where you are i hope? i notice you are 3 hours ahead.

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  • Chevrolet Master
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Check all main circuit fuses to make sure none are blown. Main fuses will be in the power distribution center. On older vehicles there will be fusible link wires (black wires with soft coverings) not fuses. Check power from the ignition switch. There should be power at the accessory and ignition connections with the key in the on (run) position. If not, the switch may have failed.

Posted on May 21, 2011

  • Richard Scordino May 21, 2011

    You did not include what vehicle you have. I don't have a ton of wiring diagrams but I'd be looking for the power lead that feeds the switch. Most often it runs from the starter main terminal and joins at the bulkhead connector on the firewall before continuing into the under dash wiring.

  • Richard Scordino May 21, 2011

    OK, I do not have a diagram for that. All I can tell you is that there should be 12v feeding the switch. When you turn the key to Acc, there should be another lead that now has power (back probe connector with it connected) When the key is turned to "on", there should be additional power at another lead (powers up the ignition system ) In "start position, accessories should not have power but ignition side should as well as the lead that powers up the starter motor.
    That's basic wiring on most ignition switches. If you have a security system malfunction you may have incorrect voltages. If a wire connection in the bulkhead connector is corroded, that will also give you a problem. As i stated before, All fuses, especially the larger ones in the power distribution center need to be good. I would also check connections at the battery and at the distribution center. Test and make sure voltage is present and is not interrupted when the key is turned to start. If it disappears, you may have a connection that has broken down and needs to be cleaned. A terminal that shows 12v that is "unloaded" may drop to near zero if the connection isn't good. Don't forget to check for good grounds. Many parts of your system are controlled by relays and if a ground is poor the relays won't work. I'm not sure what you checked on the way to the ignition switch but It's possible you missed something.
    Wish I had a diagram but I gave you everything I can think of that I'd check without the benefit of a diagram.
    I'm in N.E. New York and it's either been raining, about to rain or just stopped raining for about the past eight days. Getting tired of that. It's Spring turkey season and I've been out exactly twice (bah humbug). Anyhow, start again at the battery and do careful testing and see what you come up with. I've got a feeling you missed something.

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