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I accidently put red to black and black to red on 12 volt

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The fuse is probably blown and will continue to blow until the protection diode inside the radio is replaced. Do not remove this diode, have it replaced, as it saves the rest of your radio when you hook it up backwards. Do not try a larger fuse. A standard CB radio should be fused at about 2 amps. amduke@mail.com or 804-855-4747 I can fix it if you'd like.

Posted on Jun 05, 2010

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How to set up and check the digitech qm1548 multimeter and tell me how to check a 12volt truck battery


put the black wire in the black hole , the red wire in the red hole
turn the knob( press the buttons ) to volts ad/dc adjust range to high voltage ( put the decimal point 3 places to the right on the screen
connect the black wire to the negative pole of the battery
put the red wire to the positive pole of the battery and read the dial /screen
the reading on a good battery will be 12 volts to 13.5 volts
now have some one start the engine
check the voltage while cranking-- should be no less than 10.5 volts ( anything less indicates a faulty battery)
once the engine is running increase rpms to around 2500 rpms
battery voltage should now read 14.5-14.8 volts
if it stays at 12 volts , the alternator / regulator is not working
if the running engine voltage is at 11 volts , the battery is supplying power to the electronics
Of course if you do not know how to read a multimeter or know how to follow the user instructions for the meter, what I have detailed here will not mean much , so take the vehicle to an accredited auto electrician and have a proper diagnosis done

Aug 22, 2016 | The Music

1 Answer

IS THE SMALL WIRE ON THE STARTER HOT


YOU HAVE LARGE RED POSITIVE WIRE TO STARTER SOLENOID. AND A SMALL WHITE BLACK WIRE WHICH IS THE IGNITION SWITCH WIRE GOING TO STARTER SOLENOID.THAT SMALL WIRE SHOULD BE HOT TAKE A 12 VOLTS TEST LIGHT OR DIGITAL VOLT METER CHECK VOLT OUT PUT AT THE SMALL BLACK WHITE WIRE.

Aug 23, 2011 | 1991 Nissan Pickup

1 Answer

Hello, I need to know the wiring connection destinations by color for all wires coming out of the back of the Pioneer DEH-P9200R car audio receiver. Thanks in advance. John from Baltimore


If this helps you then please help my rating,voting for me would be great too thanks.

Black - Ground
Blue - Power Antenna / Control for an AMP
Orange - Constant 12 Volts
Red - 12 Volts when the ignition is on, 0 Volts when it's off

[Speakers]

[Front]
Gray - Front Right Positive
Gray Black - Front Right Negative
Green - Front Left Positive
Green Black - Front Left Negative

[Rear]
Gray Red - Right Rear Positive
Black Gray - Right Rear Negative
Green red - Left Rear Positive
Black Green - Left Rear Negative

Nov 15, 2010 | Car Audio & Video

1 Answer

No blue power light and doesnt turn all the way on no starting beep gateway gt5220


I would suspect a bad power supply. Before doing anything make sure power is actually getting to the computer. Check the power cord with a volt meter. You should have around 115 volts. If all is well you need to see if the power supply is putting out the correct voltage. Open the PC up and set the multimeter to DC voltage.
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply. Curtorsey: IT Professionals

Mar 09, 2010 | Gateway GT5220 PC Desktop

1 Answer

Will a bad Alternator stall the engine


It can, if it's not keeping the battery charged up.
Have it tested, or take a volt meter, put switch to 12 volts, put the leads on the battery terminals, red to red, black to black, if the the meter doesn't show at least between 14 and 15 volts, the alternator is bad.

Nov 10, 2009 | 1992 Nissan Stanza

1 Answer

Convert portable batteries to 12 volt boat ststem, Eagle Super Pro I.D


Cut the battery wires where they hook up to the machine. When cut they might need some more wire spliced to them. Get some alligator clips to put on your red and black wires to hook right to your boat battery. When not in use on the boat get a small 12 volt battery, cheaper then two 6 volt disposables.

Aug 10, 2009 | Eagle Fishmark 320 Portable Fishfinder

2 Answers

I need a wiring diagram for this stereo


FOR 16-PIN HARNESS
Pin Number Wire Color Function 1 White Left Front (+) 2 Green Left Rear (+) 3 Violet Right Rear (+) 4 Grey Right Front (+) 5 Blue/White Amplifier Remote 6 Blue Antenna Remote 7 Red Accessory 12 Volts 8 Black Ground 9 White/Black Left Front (-) 10 Green/Black Left Rear (-) 11 Violet/Black Right Rear (-) 12 Grey/Black Right Front (-) 13 Sky Blue Telephone Mute 14 Orange/White Illumination 15 Not Used Not Used 16 Yellow Constant 12 Volts

FOR 9-PIN HARNESS
Pin Number Wire Color Function 1 Not Used Not Used 2 Black Ground 3 Grey Right Positive 4 Grey/Black Right Negative 5 Blue/White Amplifier Remote 6 Red 12 Volt Switched 7 Yellow 12 Volt Constant 8 White Left Positive 9 White/Black Left Negative
MAY THIS HELP YOU

Jul 04, 2009 | Sony CDX-GT210 CD Player

1 Answer

Power supply suddenly 'dead'


You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

Mar 22, 2009 | Computers & Internet

1 Answer

Which colors go where in the power cord?


You Really only Have
* RED....POWER + 12 VOLTS USE VOLT METER OR 12 VOLT TEST SHOULD ONLY HAVE POWER WHEN THE KEY IS TURNED ON.

* YELLOW......ALWAYS HAS +12 VOLTS
*BLACK........GROUNDS
* THE SPEAKER WIRES WILL WILL HAVE 2 WIRES OF THE SAME COLOR (EXAMPLE) GREEN AND THE OTHER WILL BE GREEN WITH BLACK LINE ON IT .YOU WILL HAVE 4 SETS OF THESE .IF THIS IS TO MUCH FOR YOU.. PICK UP THE REPAIR BOOK FOR THAT CAR IT WILL HAVE THE CONN.PIN OUTS. GOOD LUCK.

Feb 20, 2009 | Panasonic CQ-C1103U CD Player

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