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Positive or negative ground - CLK-Class Mercedes-Benz Cars & Trucks

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All vehicles are negative to ground

Posted on Feb 18, 2015

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elshaddai159
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SOURCE: ford 1990 ea fairmont. positive or negative

Hi
It is definitely negative ground mate.

Cheers

Jason

Posted on Apr 06, 2010

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Is a 2007 Kia Spectra negative grounded or positive grounded?


ALL modern cars are positive ground. What did you do?

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No spark from coil to distrubuter


Disconnect the ignition coil output wire at the distributor cap.
Connect a spark plug to the end of the ignition coil output wire which you just disconnected.
Connect a ground wire to the threaded portion of the spark plug.
Disconnect the ignition coil ground wire from the negative terminal on the coil (Green Wire).
Connect one end of a ground wire to the ignition coil negative terminal.
Turn the ignition switch to the ON position.
Tap the other end of the ignition coil ground wire jumper on an good grounding point (for example the battery negative terminal) and look for sparks at the spark plug that correspond to the frequency of your tapping of the ground wire.
If you have a good spark at the spark plug, the ignition coil is good.
If you don't get a good spark, check for approximately 12 VDC from the coil positive terminal (black wire) to ground with the ignition switch in the ON position. You should also get approximately 12 VDC from the coil negative terminal (Green wire) to ground
Ignition Coil Resistance Check

In addition to the test above, you may elect to perform an ignition coil resistance check as confirmation of the coil's condition.

Check the ignition coil primary coil resistance by connecting an ohmmeter between the positive (Black wire) and negative (Green wire) terminals on the coil. The resistance should be 0.4 to 0.6 ohms.
Check the ignition coil secondary coil resistance by connecting an ohmmeter between the coil output terminal and the ignition coil negative terminal. The resistance should be 5000 to 7200 ohms.

You may have a bad coil or bad ground or wire connection

Jan 23, 2017 | Cars & Trucks

1 Answer

How do i determine of my 2008 hyundai elantra is negative grounded or positive grounded?


If you have a multimeter, it should be easy. Black lead on frame and red lead on "hot". If you read -12 Volts, you have a positive ground. If you read + 12Volts, you have negative ground system.

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1 Answer

Freightliner wiring diagrams


If you are running a 24 volt starter with two 12 volt batteries
Battery one negative to ground on the vehicle. positive to negative post on battery two and positive on two to the starter.

Aug 21, 2014 | Cars & Trucks

1 Answer

Full and oil gauge work on and off I think its bad grounds where would the ground wires be


Essentially, a "ground" is an electrical connection to a common return in circuit. In automotive terms a ground is a connection to the body or other metal surface of the vehicle. The body in the RX-7 is connected to the negative terminal of the battery. Thus any connection to the body of the car is a connection to the negative terminal of the battery. Electricity flows from the positive of the battery, through the circuit to do some work, then back through the body to the battery (technically electrons actually flow from negative to positive but that is beyond the scope of this article). This is a "negative ground" system which is by far the most popular automotive ground scheme used in the automotive world. "Positive ground" systems were popular in the beginning with all car manufacturers and continued on in British vehicles until recently.

The main reason this is done is to greatly simplify the wiring of a vehicle. Since most car bodies are made of metal (at the very least almost all frames are) they provide a perfect ground plane, eliminating the need to run a separate ground wire to each circuit which almost chops the amount of wire necessary in half.

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2 Answers

I have a Triumph Spitfire MK2 1965. How do I tell if it is a pos gnd or neg gnd


Easiest way is to follow the battery cables. if the Negitave (-) goes to the engine block , frame or body, that is a negitive gorund system. If the Positive (+) does, it is a Positive ground system.

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How ca you tell if the coil is bad


with key off, pull coil wire from distributor and hold it near a ground point. put a jumper wire from positive battery to positive coil terminal. Briefly jump the negative coil terminal to ground. Coil should release a spark to ground when ground is removed from negative terminal. Make sense?

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1 Answer

92 sable wont hold charge good batery new alternator what could be the problem


first you need to check your unit maybe it is grounded,,how to know if your unit is grounded? using tester get your tester in x1 mode, test the tip of battery terminal positive to positive negative to negative, automatically the tester make a deflection.after that switch it .. positive battery terminal to negative wich is the color black wire of the tester,if theres a deflection again ,,,, your unit is grounded

Jul 28, 2010 | 1992 Mercury Sable

1 Answer

With battery ground disconnected and positive connected if i take a voltage tester and touch from battery ground to chassis ground i get 12.52 volts, just what the battery tests,+ to -.


Are you sure you were touching the negative post and not the positive post. If you checked the positive post and the other wire to body chassis then you should get the reading you say here. Negative to negative is negative and you should have had no reading at all. Please do this test again being absolutly posative your touching the negative post. There will be a - sign on the battery under that post. Get back to me after the double check, Raz

Apr 18, 2010 | 1996 Mercury Mystique

1 Answer

Ford 1990 ea fairmont. positive or negative


Hi
It is definitely negative ground mate.

Cheers

Jason

Apr 06, 2010 | Ford Fairmont Cars & Trucks

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