# Quick Answer: Is There A Difference Between A 6 Volt Coil And A 12 Volt Coil?

## Can you use a 12 volt coil on a 6 volt system?

You can run a 1.5 ohm “12 volt coil” on a 6 volt car without a ballast resistor and it will run great.

Some “12 volt coils” read out at about 3 ohms and can really only be used on a 12 volt car.

The spark out of this “12 volt coil” when used on a 6 volt car will be very weak..

## Does a 12 volt coil need a resistor?

When a 6 volt ignition system is converted to 12 volts either a 12 volt coil must be installed or a resistor installed in the circuit to reduce the coil voltage to 6 volts. The resistor regulates the voltage, keeping it at 6 volts, allowing the original 6 volt coil to be used in a 12 electrical system.

## How many ohms should a 12 volt coil have?

Most coils should read between 0.4 and 2 ohms. Zero resistance would indicate a shorted coil while a high resistance reading would indicate an open coil. Secondary resistance is measured between the positive (+) terminal and high voltage output terminal.

## How much voltage should a coil have?

The voltage reaching the coil may be 12 volts , or about 7 volts if the coil has a ballast resistor . Most electrical equipment works on 12 volts, but most modern cars have a resistor in the ignition system to assist starting. The coil in a ballast-resistor system is rated at 7-8 volts instead of 12 volts.

## Will a 6 volt generator charge a 12 volt battery?

Re: 6v generator with 12v battery If you have a cutout rather than a regulator you can, it will charge it, just not very fast.

## How many ohms Should a coil wire have?

Keep the other lead on the positive post of the coil. Note the resistance reading on the ohmmeter. Your coil should have a reading of between 6,000 and 15,000 ohms for your Ford.

## Will an engine run without a condenser?

Yep, cars WILL RUN without a condenser (it’s really a capacitor) but the points will burn out faster! Electrical current will try to keep flowing when a switch (the points in this case) are opened so there will be an ‘arc’ across the points until they are open far enough to break the circuit.

## How do you test a 12v ignition coil?

How to Test 12 Volt Ignition CoilsDisconnect your engine’s main negative battery cable with a wrench.Pull the main ignition coil wire, the one that leads to the distributor, off the coil. … Turn on the multimeter and set it to the “ohms” function.More items…

## How can you tell if an ignition coil is bad?

Symptoms of a Bad or Failing Ignition CoilEngine misfires, rough idle, and loss of power. One of the most common symptoms associated with a faulty ignition coil is engine performance issues. … Check Engine Light comes on. Another symptom of a potential issue with the vehicle’s ignition coils is an illuminated Check Engine Light. … Car is not starting.

## How do I know if my coil is 6v or 12v?

If you have an accurate ohm meter, reading across the posts of a 12 volt coil should be about 3 ohms. A 6 volt coil is about half of that. It is not an exact number, but close enough that you can tell 6 from 12 volt. Or, doing what Tom says, a 12 volt coil will flow about 2 amps if connected to 6 volts.

## Are 6 volt and 12 volt condensers the same?

No such thing as a 6V or 12V ignition condenser. Irrespective of applied primary voltage (6V, 12V, 24V) the condensers are made to withstand the flyback or reverse EMF voltage made by the coil as it’s magnetic field collapses when the points open.

## Should negative side of coil have power?

The power from the ignition switch need to go to the plus side of the coil and the negative goes the the distributor on a 12v system. That should be opposite what it was on a 6v positive ground.

## Can a bad condenser cause weak spark?

The condenser serves to enhance the spark by greatly increasing the voltage to the input of the coil. … If you do have this good ground connection through the points, then you may have a bad condenser. Weak spark is often the result of a bad condenser (and it’s a cheap part to replace).

## How many ohms Should a coil read?

Most ignition coils should have a primary resistance falling somewhere between 0.4 and 2 ohms; however, refer to your manufacturer’s specifications for the correct reading. If a reading of zero is displayed, that signifies that the ignition coil has shorted internally in the primary windings and needs to be replaced.

## What happens if you hook a coil up backwards?

Second, your car would have run just fine having the wires reversed at the coil, only difference is the spark at the plug tip would have jumped “backwards,” from the ground or block to the center electrode on the plug, instead of the other way around. Since it’s still producing spark the engine will still fire.