I connected the red wire to the positive and the black wire to the negative but the 30 amp fuse keeps burning out immedietly and my diaphram pump won't turn on at all. What is going wrong?

2004 Hyundai XG350 Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Red
Car Radio Switched 12v+ Wire: White/Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Brown/White
Car Stereo Dimmer Wire: Green
Left Front Speaker Positive Wire (+): Brown/White
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): Brown/Yellow
Right Front Speaker Negative Wire (-): Black/Yellow
Left Rear Speaker Positive Wire (+): Brown/Red
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Black/White

If it's only 4 wires, Red & black are typically power. red +12volts & black is ground. Gray would be one channel say right side and green would be left (example) you would ground the negative speaker lead on both sides. That is probably an old unit and make sure your car is negative ground. Some Ford & Nissan are positive grounded for some circuits which you may need to reverse the power connections. Make sure there is an in line fuse on the power wire just in case.

Maybe the pump has a wire inside it that is shorting it out

there is a dead short in the circuit that that fuse controls. Go from the fuse and trace the wiring look and look for cuts , wear points pinched wires and if you have installed anything like an amp or radio etc check that you have the correct polarity.

Check this for...
-
2005 Nissan Pathfinder with Bose Audio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Yellow
Car Radio Accessory Switched 12v+ Wire: Green/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: Green
Car Stereo Amp Trigger Wire: Green
Car Stereo Amplifier Location: Under the Driver Seat
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): White
Left Front Speaker Negative Wire (-): Black
Right Front Speaker Positive Wire (+): Yellow
Right Front Speaker Negative Wire (-): Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Black/White

-
2005 Nissan Pathfinder Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Yellow
Car Radio Accessory Switched 12v+ Wire: Green/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: Green
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Brown
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Green
Left Rear Speaker Negative Wire (-): Black
Right Rear Speaker Positive Wire (+): Gray
Right Rear Speaker Negative Wire (-): Orange

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Hi, there is a factory wire (red with a black stripe) in your car for illuminating the stock radio. This wire is not to be used in an aftermarket radio, so you need to make sure it isn't connected and also isolate and bare wire with electrical tape. Please let me know if you have questions, and thanks for using FixYa.

1999 Mazda Protege Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Blue/Black
Car Radio Ground Wire: Black/Yellow
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6 1/2? Speakers
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Violet
Left Front Speaker Negative Wire (-): Blue/Orange
Right Front Speaker Positive Wire (+): Yellow/Blue
Right Front Speaker Negative Wire (-): Violet/White
Car Audio Rear Speakers Size: 6? x 9? Speakers
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Yellow
Left Rear Speaker Negative Wire (-): Orange
Right Rear Speaker Positive Wire (+): Green/Orange
Right Rear Speaker Negative Wire (-): Green/Black

Hi, your factory Sunfire wire colors are pasted below. The yellow wire should be accessory. This should connect to the stereo's red power wire. The orange "always hot" wire should connect to the stereo yellow wire--this is only used to keep your station presets in memory. Please let me know if you have more questions, and thanks for using FixYa.

2004 Pontiac Sunfire Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: Pink
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

When you put the stereo in, what did you do with the red wire with a green stripe? The aftermarket radios don't always use these, so you have to wrap the ends, depending on whether or not you used a wiring harness. If that wire is shorted on the chassis, it will blow the dimmer fuse.

1995 Honda Accord Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/White
Car Radio Accessory Switched 12v+ Wire: Yellow/Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: Red/Green
Car Stereo Antenna Trigger Wire: Yellow/White
Car Stereo Amp Trigger Wire: Violet/Red
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4?
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Blue/Green
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): Red/Green
Right Front Speaker Negative Wire (-): Brown/Black
Car Audio Rear Speakers Size: 6 1/2?
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Blue/Yellow
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): Red/Yellow
Right Rear Speaker Negative Wire (-): Brown/White

this might help
1994 Toyota Pickup Car Security Wiring Diagram
Battery Constant 12v+ Positive Wire (+): White And White/Red
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): Black
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire (+): Black/Yellow
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire (+): Black/Yellow Or Black/Red
Second Ignition Positive Wire Location: Ignition Switch Harness
Accessory Positive Wire (+): Blue/Red
Accessory Positive Wire Location: Ignition Switch Harness
Parking Light Negative Wire (-): Red/Black
Parking Light Negative Wire Location: At Steering Column Harness
Parking Light Positive Wire (+): Green
Parking Light Positive Wire Location: In Drivers Kick Panel
Power Door Lock Negative Wire (-): Blue/White
Power Door Lock Negative Wire Location: At Door Control Relay. The door control relay, is located behind the driver dash speaker.
Power Door Unlock Negative Wire (-): Blue/Yellow
Power Door Unlock Negative Wire Location: At Door Control Relay. The door control relay, is located behind the driver dash speaker.
Door Trigger Negative Wire (-): Black/White Or Black
Door Trigger Negative Wire Location: At 2-Pin Plug, Top Of Fusebox
Domelight Supervision Wire: Use Door Trigger, Requires Relay
Domelight Supervision Wire Location: N/A
Horn Negative Wire (-): Green/Red
Horn Negative Wire Location: At Steering Column Harness
Tachometer Wire Negative Wire (-): Black
Tachometer Wire Negative Wire Location: At Diagnostic Connector. The diagnostic connector, is located on the passenger inner fender near the fuse/relay box.
Brake Light Positive Wire (+): Green/White
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): N/A
Factory Alarm Disarm Wire Location: N/A
Factory Anti-Theft System: N/A
Factory Anti-Theft System Location: N/A

here is the radio's wire color diagram, u should be able to fix the problem with this info.Fuse box is on drivers side under the dash.
1991 Ford Tempo Car Radio Wiring Guide
Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6 1/2′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Car Audio Rear Speakers Size: 5′ x 7′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange