How do you wire a ballast resistor?
Connecting a ballast resistor is a fairly straightforward project, but you will want to pay attention to the wiring.
- Step 1: Determine if Ballast Resistor Is Needed.
- Step 2: Locate Ballast Resistor along Firewall.
- Step 3: Drill Holes for Securing Resistor.
- Step 4: Install Ballast Resistor.
- Step 5: Connect Wires to Positive.
Where is the ballast resistor connected?
Note: Ballast resistors are usually located bolted to the firewall if your distributor and/or coil is at the rear of the engine. If your distributor is located near the front or side of the engine in the case of an inline-4 cylinder, then it’s probably right near the ignition coil or distributor.
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 happens when a ballast resistor fails?
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.
Does a ballast resistor reduce voltage?
The ballast resistor, supplies the needed voltage during the start up, and then immediately after the arc is established, it reduces the voltage in addition to regulating the current flow.
How do I know if I have a ballast 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.
What happens when a ballast resistor goes bad?
What does a 12 volt ballast resistor do?
A ballast resistor is a device in your vehicle that limits the amount of current in an electric circuit. The ballast resistor is commonly found in older vehicles, because they did not have the benefit of circuit boards found in most of today’s vehicles.
How much voltage does a ballast resistor drop?
The external ballast resistor (or resistor wire) will provide an additional 1.5 ohms of resistance. Current flowing through the ballast resistor will create a voltage drop and thus lower the coil’s operating voltage to something between 6- and 9-volts.
