# Will any 12 volt coil work?

August 3, 2020 Off By idswater

## Will any 12 volt coil work?

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.

## Is there a difference between a 6 volt coil and a 12 volt coil?

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.

## Can you put a 12V battery in a 6V tractor?

A 12v battery is a 12 volt battery, you can’t use it at 6v. It doesn’t work that way. Each of the 3 cells in a 6v battery produces a bit over 2 volts, just like each of the 6 cells in a 12v battery produces a bit over 2 volts. Because that’s what a lead-acid battery cell does.

## Can you use a 6 volt coil with a 12 volt battery?

There is nothing inherent in the construction of a coil that makes it 6 volt, 8 volt, 12 volt or any other volt. In other words there is no reason that a coil that was originally sold for use in a 6 volt system can’t be used in a 12 volt system.

## How many ohms should a ignition coil read?

between 0.4 and 2 ohms
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.

## How does a 12v ignition coil work?

An ignition coil is basically an electromagnet. The coil becomes a transformer, stepping the voltage up. If your car uses a 12 volt battery, the 12 volts you put into the primary side of the coil will exit the secondary side as 30,000 volts!

## Can a 12 volt ignition coil still work?

While ignition coils will generally last for the life of a vehicle, faulty spark plugs or spark plug wires can send irregular voltage surges through the ignition coil, causing the coil to burn out. You can test a 12-volt ignition coil for effectiveness by checking the resistance of its wire windings with a multimeter.

## What should the spark be on an ignition coil?

There should be a bright blue spark between the electrodes every time the cylinder fires, provided that there is enough voltage reaching the spark plug. The coil is likely to be faulty if there is no spark. A digital multimeter is required for testing the resistance levels of the ignition coil.

## How do you test a car ignition coil?

In order to test the spark, pull the spark plug from the engine, and then start the car. There should be a bright blue spark between the electrodes every time the cylinder fires, provided that there is enough voltage reaching the spark plug. The coil is likely to be faulty if there is no spark.

## What should the meter read on a 12 volt ignition coil?

The meter should read 6,000 to 15,000 ohms. If it does not, the coil’s secondary winding is faulty. Remove meter’s probe from the center terminal and touch it to the terminal bolt on the opposite side of the coil from the probe touching the grounding terminal. The meter should read between approximately 0.4 and 2 ohms.