Why do you need a ballast resistor?

Why do you need a ballast resistor?

A ballast resistor is used in a circuit to limit the current and hence prevent it from over current faults. Here, as the current in the circuit varies and increases above a particular threshold value, the resistance also starts to increase.

What does ignition ballast resistor do?

The ballast resistor allows the ignition system to operate at a lower voltage until the engine starts. The ballast resistor then functions to regulate the voltage going to the ignition system to avoid additional wear on the system.

What causes a ballast resistor to fail?

The resistance through the ballast resistor varies with current flow which varies with engine rpm. This naturally causes the resistor to expand and contract from heat. That’s why they eventually fail.

How do I replace a ballast resistor?

Connecting a ballast resistor is a fairly straightforward project, but you will want to pay attention to the wiring.

1. Step 1: Determine if Ballast Resistor Is Needed.
2. Step 2: Locate Ballast Resistor along Firewall.
3. Step 3: Drill Holes for Securing Resistor.
4. Step 4: Install Ballast Resistor.
5. Step 5: Connect Wires to Positive.

Can I remove the ballast resistor?

In either type of ignition system, points or electronic, the ballast resistor can be removed to increase secondary voltage to the spark plugs, but the long-term effects of removing the resistor differ between the two systems. On the left is a factory style resistor; on the right, an aftermarket unit.

Does a ballast reduce voltage?

Once the arc is established, the ballast quickly reduces the voltage and regulates the electric current to produce a steady light output. Thus, some ballasts have a separate circuit that provides a low voltage to heat the lamp electrodes during lamp starting and typically during lamp operation (Hammer, 1995).

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

What is the difference between the two types of coils? Basically, a non-ballast coil is designed to produce full spark output with 12 volts on the input (+ terminal). A ballast coil is designed to produce the same spark output, but with only 6 to 9 volts on the input.

How do I know if my coil needs a ballast resistor?

Ballast ignition systems were introduced in around 1970. To find out for sure, use a multimeter to check the voltage on the positive wire of the coil with the ignition on. You can test the resistance of the coil using a voltmeter and measure the Ohms (resistance) across the +’ve and –’ve terminals.

How does a ballast coil work?

The ballast-resisted system utilises a 6 (commonly called the ‘cold start’ system) or 9-volt coil instead of the older style 12-volt item. When you hit the starter button/key, the coil is still seeing maximum current so produces a nice, big, fat, 12-volt induced spark to start the engine.

What does a ballast coil do?

What is a ballast? Quite simply, it is a resistor that has the purpose of reducing the voltage to the coil.

How does a 12v 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!

How many volts should my ignition coil have?

Electricity Goes Out The average vehicle ignition coil puts out 20,000 to 30,000 volts, and coils used in racing applications are capable of 50,000 or more volts at a constant rate. This new voltage is then routed to the distributor via the coil wire, which is just like the spark plug wires, only normally much shorter.