And while ignition coil life may be compromised without a resistor, the additional secondary voltage (at the spark plug) is increased which generally improves power. So does your application require a ballast resistor? Quite simply, if your distributor has breaker points the answer is yes; if not, the answer is no.
What does an ignition ballast resistor do?
The ballast resistor allows the ignition system to operate at a lower voltage until the engine starts. After ignition, the alternator begins to recharge the battery, restoring the regular voltage.
What is the resistance of a ballast resistor?
A “standard” coil will have an internal resistance close to 3 ohms on its primary windings. The coil for a ballast ignition system will have a primary winding resistance between 1 and 2 ohms. The external ballast resistor (or resistor wire) will provide an additional 1.5 ohms of resistance.
Which circuit the ballast resistor is used?
Ballasts can also be used simply to limit the current in an ordinary, positive-resistance circuit. Prior to the advent of solid-state ignition, automobile ignition systems commonly included a ballast resistor to regulate the voltage applied to the ignition system.
Why does my ballast resistor get hot?
Old style Ballast resistors get hot, its the way they work and why they are mounted the way they are. Basically if you were to remove the filler you would find a wire coil, usually a fairly thick gauge and the current flowing through this is creates the resistance. A By-product of this is heat.
Do ballast resistors 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.
Can you hook up a ballast resistor backwards?
Resistors are blind to the polarity in a circuit. Thus, you don’t have to worry about installing them backwards. Current can pass equally through a resistor in either direction. In accordance with Ohm’s law, if the voltage in a circuit remains the same, the current will decrease if you increase the resistance.
What is a ballast resistor?
A ballast resistor is a device in your vehicle that limits the amount of current in an electric circuit.
How does an electric ballast work?
Electric ballasts can be resistors, capacitors, inductors, or a combination of these. Ballast resistors are able to change resistance with the current. If the current flowing through the resistor increases above the threshold value, the resistance increases. The resistance can then correspondingly decrease as the current decreases.
What does a jumper wire do on a ballast resistor?
A jumper wire is usually attached to the ballast resistor to provide enough voltage to start the engine. If your vehicle starts then stalls, or won’t start at all, you may want to check your engine’s ballast resistor to make sure it is working as it should.
What type of ballast resistor is used in fan speed selector switch?
A fixed ballast resistor with two centre taps is used. The fan speed selector switch bypasses the portions of the ballast such that for full speed, whole portion is selected and for the low speed, no portion of the ballast resistor is selected.
