Quick Answer: Do I Need A Resistor For My Coil?

What does an ignition coil resistor do?

Ballast Resistor for Automotive Applications Due to its application, such devices are called Ignition Ballast Resistor.

Use of this device reduces the risk of coil failure.

It is installed in the circuit between the primary voltage source for the ignition coil and the coil stud..

Can I bypass ballast resistor?

The duty of the ballast resistor is to limit voltage to the ignition coil. … A quick and easy way to diagnose ballast resistor failure is to bypass it by running a temporary jumper wire from the battery to the coil. If it starts and remains running, you’ve found the problem.

How many volts should a coil put out?

The voltage required is constantly changing and can vary from as little as 5,000 volts up to 25,000 volts or more. Some systems can put out as much as 40,000 volts under peak demand.

What happens when a ballast resistor goes bad?

If your ballast resistor is bad, your vehicle will not run and you will have to have it towed to the mechanic’s shop. … The biggest sign your ballast resistor is bad is your vehicle will start, but immediately stop as soon as you let go of the key.

How do you tell if you have a 6 volt or 12 volt system?

Manually count the number of battery vents contained in the battery. The battery vents are usually covered with small round plastic caps located at the top of the battery. Multiply the number by 2.1 volts. The resulting number is the approximate battery voltage, and thus the electrical system voltage.

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. Other then that start checking connections down the line from the ignition switch for power.

How do you test a 12v coil?

To check your coil, ensure you have 12V going to the positive terminal. Once you confirm that is the case pull the wire out of the centre of the distributor and hold it a cm away from the distributor centre terminal. Have someone crank over the engine, and there should be a nice blue spark..

Does a ballast resistor need to be grounded?

A Ballast resistor should NEVER be grounded! … The resistor limits the CURRENT going through the coil. Also, if you have a points ignition, it lengthens the life of the points greatly.

How do you wire a resistor to a coil?

Strip the end of the positive wire from the ignition, and connect it to the positive end of the resistor. From the other terminal on the resistor a wire goes to the positive on the coil. Make sure to attach securely to the connecting terminal, by wrapping the wire around the post and tightening with a screwdriver.

Can a 12 volt coil be used on a 6 volt system?

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. … If a 6 volt ignition system is converted to 12 volts and a Delco style 12 volt coil with an internal resistor is installed as part of the conversion, no external resistors are required.

Do you need a resistor with a 12 volt coil?

If a 6 volt ignition system is converted to 12 volts and a Delco style 12 volt coil with an internal resistor is installed as part of the conversion, no external resistors are required. The 12 volt battery must be connected so the negative (-) battery terminal is connected to ground.

Do I need a ballast resistor with electronic ignition?

Electronic ignition systems, whether factory Mopar or aftermarket, don’t utilize breaker points, thereby not actually needing a ballast resistor to control amperage through the pickup coil.

What is the difference between a ballast and non ballast coil?

ballast vs. non-ballast A ballasted system is designed so the coil’s normal operating voltage is around 6-9 volts and a non-ballasted system is designed to operate around 12 volts. … The type of ignition system determines the resistance of the coil you should be using.

Does a resistor reduce voltage?

Does a resistor reduce current and voltage? Absolutely! A resistor is about to reduce the current and voltage. For example, when the current flows through the resistor, it will always generate a voltage drop, and which is mainly reflected in the decrease of the output current and the voltage.

How do you test a coil resistor?

To test your ballast resistor you need an ohm meter or multimeter set to ohms. Remove the connectors from both sides of the resistor. The ohms should read between 1.8 and 5 ohms. You should be getting 9 volts to the positive side of the coil.

How many ohms should a 12 volt coil have?

Most ignition coils should have a secondary resistance falling somewhere between 6,000 to 10,000 ohms;however, refer to manufacturer specifications for the correct range.

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

6v coil can spark better on lower voltage than 12 v coil, until ballast heats up then about the same.

How can I tell if I have a 6 volt or 12 volt?

A 6 volt battery has 3 cell caps. A 12 volt has 6 cell caps.