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Electrical Issue! No Power to ignition broken down at work

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Old 06-13-10, 12:07 AM
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Rotors? What Are Those?

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Electrical Issue! No Power to ignition broken down at work

Hey guys i made it home but my car is sitting at work i have a quick question... It seems to me like its a relay but heres the issue.. car has power headlights/running lights/hazards work fine but seems like there's no power to the ignition/fuel pump. idiot cluster gets no power nothing.. any ideas?
Thanks
TwEaK
Old 06-13-10, 12:14 AM
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always start with fuses, did you check all the fuses?
Old 06-13-10, 12:43 AM
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Start with the main fuse in the engine fuse box. If that is okay then remove the plug with two wires from the ignition pigtail which houses a Black wire and a Black/White wire and check for voltage on the Black wire as it should have constant voltage. This Black wire supplies your ignition switch with power.
Old 06-13-10, 01:56 AM
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Rotors? What Are Those?

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^^^^ where is the plug located?? all fuses are in good shape is the plug accesible without remove the surround or does the surround need to be removed? is it just 2 wires in the plug?

thanks for all your help guys
TwEaK
Old 06-13-10, 09:43 AM
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Originally Posted by TwEaK
^^^^ where is the plug located?? all fuses are in good shape is the plug accesible without remove the surround or does the surround need to be removed? is it just 2 wires in the plug?

thanks for all your help guys
TwEaK
It's located near the steering column and it is a two wire plug that is grouped together with a couple of others.

So when you turn the key to "accessory" or "on" you're not able to use the radio or turn signals or wipers? If this is the case, then your ignition switch is not getting power, or it's getting power but not passing the power onto the proper wires that powers up the interior fuse box that allows the above items to work.
Old 06-13-10, 10:35 AM
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Rotors? What Are Those?

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ok so if those wires are getting power then its the ignition switch that needs to be replaced? If there not getting power what else could it be?

Thanks again for all the help guys
TwEaK
Old 06-13-10, 10:47 AM
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Originally Posted by TwEaK
ok so if those wires are getting power then its the ignition switch that needs to be replaced? If there not getting power what else could it be?

Thanks again for all the help guys
TwEaK

Just the Black wire has constant voltage. When you turn the key to "on" the voltage from the Black wire is passed on to the Black/White wire and then the voltage is passed on to the IG1 fuses in the interior fuse box. If you find voltage on the Black wire, but the ACC,IG1 and IG2 powered items are not working with the key turned to "ACC" or "ON", then use a short jumper wire and jumper the Black with the Black/White wire (the two wires in this particular plug) and anything that gets power from the IG1 fuses will work (no key necessary here). These items would be power windows, turn signals, rear defroster, warning lights, and the B/W wire powering the main relay, alternator and circuit opening relay.
Old 06-13-10, 03:52 PM
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Rotors? What Are Those?

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Ok.. no power to anywhere on the car but headlights/running lights any other ideas? im still thinking its a relay any ideas?
Thanks
TwEaK
Old 06-13-10, 04:18 PM
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Originally Posted by TwEaK
Ok.. no power to anywhere on the car but headlights/running lights any other ideas? im still thinking its a relay any ideas?
Thanks
TwEaK
The reason why you have power to your headlights is because they are powered by the battery bus which does not require the ignition switch to work. All the rest of the fuses in the interior fuse box that are part of ACC, IG1 and IG2 circuits must go through the ignition switch. There is a wire,Black, waiting to put power to the wires in the ignition switch that is the source of power for ACC,IG1 and IG2 fuses. There are no relays involved in getting the voltage from the battery to the ignition switch. If you had no power on the Black wire at the specific plug which I mentioned then the Black wire is not getting voltage from the 80 amp main fuse in the engine fuse box. Check why that is so. This fuse box is getting voltage as proven by the lights working but it is not passing power onto the Black wire properly or the connection between the two Black wires(where the engine harness meets up with the front harness FE-01)is disconected or some other mating problem. This is all that separates the 80 amp fuse and the two wire plug that should have had voltage on the Black wire.
Old 06-13-10, 05:09 PM
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Rotors? What Are Those?

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satch i appreciate your help.. so im going to go check if that black wire has power if it does.. then my ignition switch is messed up correct?

TwEaK
Old 06-13-10, 05:19 PM
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Originally Posted by TwEaK
satch i appreciate your help.. so im going to go check if that black wire has power if it does.. then my ignition switch is messed up correct?

TwEaK
That, or the wiring and or connections between the plug with the Black wire and the ignition switch itself is damaged.
Old 06-13-10, 05:32 PM
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Old 06-13-10, 06:02 PM
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Rotors? What Are Those?

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i know this is a long shot but would you happen to have a picture of this plug? i looked under the dash but not exactly sure where its located? again thanks for all your help
TwEaK
Old 06-13-10, 06:12 PM
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The pic below is the pigtail that is plugged into the ignition switch. You can tell that this pigtail is not long at all. The plug you are looking for connects into one of the three plugs. Find the pigtail and your connector is very nearby.

Old 06-13-10, 09:29 PM
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Listen to what Satch said in an earlier post of his. He asked you to go turn the key to ON. Then see if the Turn signals work or not. IF the signals work, then your ignition switch is getting power and you've no need to get a meter out and check the BLACK wire to the igniton switch.

Or if you turn the key to ON and the gauge needles work, then you KNOW the igniton switch is passing power on to the IG1 buss which also feeds the ENGINE fuse and other items needed for the engine to start.

So read the above once more and see if any of that is true or not.

Headlights coming on only tell you that there is a battery in the car and not much else. It does NOT tell you if the right fuses are getting power or not. To know THAT you need to do what is described above by Satch and the above.

Also, touch the key cylinder with you hand. Now the electrical plugs for that cylinder are about one foot fwd of you hand . You might have to remove a a/c duct to access them. Just follow the wires on the ignition switch fwd til you find the three plugs that FEED the ignition switch. But, again. IF the key is ON and the turn signals work you Know the igniton switch is being fed. Also if the wipers work you KNOW the igniton switch is being fed pwr if the key is to ON.
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