Power wire need to know where to find main power wire

Didn't see main relay, did see, eec power relay.
Hopefully, it is under hood, driver side, wheel well lining in relay pack. If several relays and you don't know which one, look at the wiring diagram for eec power relay, Match the wire colors with relay. If you can't read it, bbbind.com has free wiring diagrams, so does autozone.com.

I don't know the 1999 Chevrolet Cavalier, but that shouldn't matter.
Starters have a very simple wiring.
The thing you have to do is find the solenoid wire because all the others go on the one terminal.
Start by attaching the main (thick) cable from the battery to the main terminal on the starter.
Then turn the ign. key on. Nothing will light up.
Try touching each of the smaller wires onto the main terminal until the ignition lights come on. Fit this one to the main terminal permanently.
Now that you have power to the ign. switch, you will be able to find the solenoid wire. It will help if you have a volt meter or test light for the next step.
With someone sitting in the car to work the ign. switch, you test each of the other wires as they turn the switch to the "Start" position. The wire that gets power to it is the solenoid wire and the ONLY one that doesn't go on the main Starter terminal.
The solenoid wire obviously goes to the terminal on the solenoid.

I need you to check something first.
I'm going to get detailed here to explain;

1) The Dell Dimension 1100 (B110) uses a 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

The above is a STANDARD pinout for the wires going into a 20-pin ATX main power cable's connector.

For a time period Dell had parts made for their computers, that were PROPRIETARY.
(All pre-built computer manufacturers have their computer parts made by somebody else)

They were Proprietary, in that the STANDARD guidelines for desktop computers was NOT followed.
They had the wires changed around for the 20-pin ATX main power cable.

They also had the pins in the 20-pin ATX main power connector, on the motherboard, changed also.
Means if you plug in an aftermarket Power Supply, it may toast the motherboard, Processor, Ram Memory, Harddrive, graphics card, (IF used), and so on.

Fun stuff huh?
Dell changed from being Proprietary as far as I know.

However you computer may fall into the old proprietary parts.
You need to compare the 20-pin ATX main power cable's connector, of the old Power Supply, TO the new Power Supply's 20-pin ATX main power cable connector.

SEE if those wires (Color code) are going into the same socket holes, as the old one.
Look at the Lock on the side, and use it for the key.

In the Standard 20-pin ATX main power cable's connector, Number 1 pin is the Orange wire, and on the side OPPOSITE of the Lock.
Number 11 wire is also Orange, but is on the same side as the Lock.

Now you have the key, check out the old Power Supply's 20-pin ATX main power cable's connector.
Same color of wires going into the proper socket holes in the main power cable's connector?

Whew! Good! Let's go on.

You need to get the Power Supply going.

Bypass the Power On switch.

IF, you bypass the Power On switch, and the Power Supply comes on, you have a bad $5 Power On switch.

IF you bypass the Power On switch, and the Power Supply does NOT come on, you have a bad Power Supply.

Test has NOTHING to do directly with the Power On switch, or it's wires.
A jumper wire is used on the Soft Power On pin, TO ANY Black wire, in the 20-pin ATX main power cable's connector,

Looking back at the 20-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

The GREEN wire is the Soft Power On wire.
A-N-Y Black wire you see is a Ground wire.

(The power wires are Positive wires. ALL Black wires are Negative wires )

The preferred jumper wire is a paper clip.
Straightened out, then bent into a U-shape.
The top of the U is wrapped a few times with black plastic electrical tape.
This taped area is for your fingers and thumb to hold onto.

Turn the U-shape upside down, and the 'Legs' are what you are going to use.
One leg goes down into a socket hole with the Green wire.
The other leg goes down into ANY socket hole that has a Black wire in it.

The 'Leg' of the jumper wire goes RIGHT NEXT TO the existing wire in the socket hole.
Where the wires go down into the connector of the 20-pin ATX main power cable, is the BACK.
The 20-pin ATX main power cable is plugged into the motherboard, as shown in the photo to the far right, in the Playtool link.

The jumper wire goes down into the Back of the connector, and into the two socket holes named above.
The jumper wire MUST go far enough down into the socket hole of the connector, to go PAST the insulation of the wire, AND touch the metal terminal at the end of the wire.

All wires going into the main power cable's connector, end in a metal terminal,

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

The left side is the Back, and the part that get's crimped on the insulation of the wire. The right side is the Front.
The Front of those Molex metal terminals can be seen in the center photo, of the Playtool link.

Contact made is no more than 2 seconds.
(The Power On switch is A Momentary Contact Switch)

Get the Power Supply going, then post back in a Comment, as to the results.

(Also make SURE the 4-pin ATX +12 Volt power cable is plugged in,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

This is power for the Processor, and sometimes forgotten. NO, it has nothing to do with why the Power Supply does not come on. Just wanted to add.

This is where it plugs into the motherboard,

http://support.dell.com/support/edocs/systems/dim1100/EN/SM/techov.htm#wp1061217

Processor and heatsink connector (J2E1) is where the Processor sits.
Processor power connector (J5B1) is where the 4-pin ATX +12 Volt power cable plugs in )

May I also ask why a new Power Supply was purchased, and a new motherboard?
Post back in a Comment.

Regards,
joecoolvette

pig tail the main hot going to your switch to your plug you will bypass the switch and will have power going to the plug hook hot to bress screw and white to silver and groud to to screw , good luck

You cannot test the power supply on the bench just by connecting it to the mains power. You need to know which pins on the connector to activate the power supply and you need to connect a load to the power leads.
The best way to test the power supply is to leave the power unit connected to the computer power up the computer and test a spare 4 wire power connector with a multi-meter. Leave the other power leads connected to the various drivers.
If computer's power LED should light up then test the voltages.
The Red and black wire should read 5 volts.
The Yellow and black wire should read 12 volts.
If the power LED does not light up, check the mains lead in another appliance to see if the mains lead is OK.
If the mains lead is OK then most likely the switch mode power supply has died.

red is for pawer that goes to the fuse panel
black is for the ground
yellow is a hot wire that goes to the main power or battery it should have a fuse in the line
blue is for power antenna if u need
blue and blue yellow speakers same with orange ,orange/white

The three main wires you need to worry about are the
Ground (Black) Battery + (Red) Constant + (Orange)
As far as the speaker wires goes you are going to have to trial and error them. They are usually color coded so for instance one wire is purple with a white stripe there would be a purple wire with a black stripe that would correspond with it. Every vehicle is different in how it is wired. I know installing a stereo looks intimidating but just split up the wires and you will see it is quite simple. Do a professional job and use crimp connectors, going the electrical tape route is never worth the time it saves.

The yellow wire is the constant wire, you need to find the battery + wire which will be red and hooked that to your deck, the red wire is the main 12v wire and the yellow wire is there just to use a little bit of power to keep the memory i yur deck, i.e. the time, cd position stuff like that

The power cable connector to the drive has 1 red (5v DC), 1 yellow (12v DC) and 2 black (common center or negative) wires feeding the required voltages from the main power supply source. The power connector will only go on one way. I hope this helps.

http://www.kb.sony.com/selfservice/microsites/search.do?cmd=displayKC&externalId=C217600&sliceId=1&sonymodel=CDXL550X&sonyregion=US&sonytemplate=1&product=SG_CDXL550X_5_12244&fes=true

this is the wire diagram for that radio .

http://www.docs.sony.com/release/CDXL550X.PDF

here is the owners manual.

J5