Question about 1992 Chevrolet Astro Extended

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12v touched ground what do I do? - 1992 Chevrolet Astro Extended

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Just check all the fuses, and replace any that have blown...relay units should be ok, and if your car starts, dont worry about it

Posted on Jul 28, 2009


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I put a brand new xtron cd dvd plus navigation stereo in my infinity qx4 suv ut the dvd put a message that said dvd is disabled for your safety what can i do to resolve that

These DVD devices are defaulted to "off" while moving to comply with motor vehicle laws that prohibit a screen from being visible to the driver when the vehicle is in motion.

Typically, there is a wire that is connected to the hand brake / parking brake circuit. If the wire is connected to (+)12V *OR* (-)12V it will enable the DVD to play. Of course, connecting to the wrong one will instantly turn the player into toast.

Locate the wiring diagram for your model to find the cable associated with the parking brake circuit. With a digital voltmeter, set to DC Volts at a range closest to - but not less than 15 Volts DC. Black lead to the - jack and the red to the + jack of the meter. Touch the black probe to ground and the red to a 12V source. You should see a 12 to 15 volt indication. Reverse the probes and you should see the same value, but with a (-) indication. Now you know that black is - and red is +.

SET the brake and turn the DVD on and play. Touch the black probe to a good ground location. Touch the red probe to the brake wire. Note the voltage. It may be 11 - 15 V or 0 to as much as 2 volts. RELEASE the brake and repeat. The voltages should be reversed with the brake RELEASED. If the DVD played with 11 - 15 volts on the wire, connect it to a constant 12 V source. If it played with 0 to 1 or 2 volts, connect it to ground.

Good luck!

Mar 10, 2015 | Cars & Trucks

1 Answer

Where is the fuse for the cigarette lighter is on a 2006 Ford F-250 PSD?

Take a standerd 12v test light take the clip and ground it anywhere then take the test light and touch the top of the fuse it has two sides on it touch each one if one side lights up and one doesn't it's bad both should light of remember to turn key on and headlights before doing this that way you can check them all its realy simple hope this helps

Feb 02, 2015 | Ford Cars & Trucks

1 Answer

Mitsubishi canter wiring diagram

It's positive because the metal plate that it touches on the steering column is grounded, but to make sure take a volt meter and touch the red side to the wire and the black side to the metal plate. It should display 12v NOT -12v

Oct 12, 2013 | Cars & Trucks

1 Answer

I need a ground schematic for a 1999 nissan maxima

Hi James,

Ground (-12 volt side of the battery) is the entire metallic parts of the car body / frame / chassis. Auto schematics only show non-grounded (+12 volt side of the battery, data and signal) circuits. This is done to reduce clutter and make it easier to read the schematics.

You will find -12V or ground on nearly all metal body / frame / chassis parts of the vehicle. To be sure you are on ground, stretch a wire from the + post of the battery to a test light or the (+) jack or probe of a meter capable of reading at least 12 VDC and touch the the probe connected to the (-) jack to the target grounded panel. If it is ground, you should read 12 volts on the meter - or in the case of the test light - a brightly illuminated lamp. A meter is the preferred device as most people can not tell the difference between a light connected to 12V vs one connected to 10V. The meter assures you of a solidly connected grounded part.

I hope this helps and good luck!

Mar 05, 2013 | Nissan Maxima Cars & Trucks

1 Answer

Only one 12v oulet works 2007 Accord

Use a 12v test light, wrap the probe with electical tape, leaving a 1/4" exposed. Touch the probe to
the bottom center contact(+)of the socket, and ground the clip wire to the metal side of the socket.
If the light comes on, check the plug on your device.
If not try another ground, if it still won't come on
check the fuses.On the top of the fuses on each
side of the amp rating stamp 20a/30a etc. you will
see very small metal contacts.
Ground the test light wire and touch the probe to
each side of the fuses. There should be power on both sides, if you have power only on one side the
Fuse is bad. Hope this helps. Good luck.

Jan 21, 2010 | 2007 Honda Accord Sedan

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Tail lights don't work, although break lights work. when fuses are replaced they burn out as soon as you turn the lights on the fuse goes out.

You have a hot wire shorting to ground.Another words there's a wire that has power(12V) going through it(when you turn on the lights) and it is touching either another wire thats connected to metal(ground) or the 12V wire itself is touching metal causing it to blow the fuse.You or an honest mechanic has to find out all the accesories (like cigarette lighter, electric door locks,and others) that are connected with the light fuse.One of these accesories may have the short thats blowing the fuse.

Nov 03, 2009 | 1996 Honda Accord

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1800 fiesta diesel wont start just stoped cam belt fine and some fuel getting to injectors

Has glow plugs --check them. you can use a 12v test light or an volt/ohm meter to test each plug. Disconnect the connector on the glow-plug ,then and touch with a 12v test light --one lead to a12v supply.If the test light lights up that plug is good. or with a volt/ohm meter ,one lead to ground and the other touching the tip of a glow-plug--that's on the ohm's scale --if it reads --showing continuity,then that plug is good.
If all check good you may have a bad glow-plug controller.

Nov 01, 2009 | 2000 Ford Focus

1 Answer

All my 12v shockets on my 2002 pt cruiser went out, two at front and one at the trunk or back ,when i was installing two speakers that light up, and in order for them to light up i had to connect them to...

Take out the fuse that applies to the 12 volt sockets and check the terminal with an ohmmeter to see if there is resistance. It sounds like a fusible link is burned up or there is a short in the wiring somewhere. Look close to the area where you were working on the speakers for any signs of burned, melted, or broken insulation on any wires. I would lean toward a burnt fusible link caused by the power surge when the power and ground touched. Hope this helped.

Jul 18, 2009 | 2002 Chrysler PT Cruiser

1 Answer

1986 Chevy Caprice Classic Horn not working

Diagram should be on the inside of the fuse box or relay cluster lid/cover. If Test light has 1 wire and a sharp tip? Yes, but only if you push the horn button too ;-)

My guess is that the horn lost its ground, but you can check this with the light. The horn only beeps when both GROUND and Pos 12v are present. The horn button gives the relay 12v to close, and the relay gives the horn 12v to operate. The ground is always connected.

Connect tester clipwire to 12v source (battery, headlight (has to be on) and touch its tip to metal of car. Does it light? Good. the tester is working and the 12v is a good source.

Touch one of the 2 horn connection or wires (poke it thru the plastic - why tip is sharp). Does it light? Touch the other, does it?

If both light, (1 will be brighter) we can assume the horn coil is good and it is getting a good ground and I was wrong (it happens... but not often). The side that is BRIGHTER is the ground wire side.

Now have someone mash the horn button. Do you hear a tiny click? That is the horn relay. If not, look for the horn relay fuse and replace it. If you DID hear the click, the relay coil is good and is trying to switch 12v to drive the horn.

Now is time to locate and replace the horn fuse or the relay may have bad contacts. Look at the other relay part numbers in the cluster and see if there is a match for the horn one. Swap it out and try the horn.

Hope this all helps. To 'test' the horn, touch the dim side again anf listen for a scratching sound. That is the 12v going thru the tiny bulb in the tester (a resistance) and trying to drive the horn.

Good Luck!

Mar 27, 2009 | 1986 Chevrolet Caprice

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