- 1 Where is the ballast resistor located?
- 2 How do you know if a ballast resistor is bad?
- 3 Can I remove the ballast resistor?
- 4 What causes a ballast resistor to fail?
- 5 Does a ballast resistor need to be grounded?
- 6 Do you need a resistor with a 12 volt coil?
- 7 What does a ballast resistor do in an ignition system?
- 8 How do you install a ballast resistor?
- 9 What is the resistance of a ballast resistor?
- 10 How do you wire an ignition with a ballast resistor?
- 11 Can you bypass a resistor?
- 12 How do you test a fluorescent ballast?
Where is the ballast resistor located?
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.
How do you know if a ballast resistor is bad?
Symptoms of a Bad or Failing Ballast Resistor
- Vehicle starts, then immediately dies. The most obvious symptoms will be the vehicle starts, but then immediately dies as soon as you release the key.
- Not starting at all. If the ballast resistor is not working properly, the vehicle will not start.
- Don’t jump the resistor.
- Let the vehicle be.
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.
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.
Does a ballast resistor need to be grounded?
A Ballast resistor should NEVER be grounded! One side of it will go to the 12 volts on The Ignition switch, The other side should go to the + side of the coil
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.
What does a ballast resistor do in an ignition system?
The duty of the ballast resistor is to limit voltage to the ignition coil. This added longevity to the coil as well as protected the ignition system from over-voltage. Symptoms of a bad ballast resistor may be a crank but no start or start followed by an immediate stall.
How do you install a ballast resistor?
- Step 1: Determine if Ballast Resistor Is Needed. In many of today’s vehicles, the ballast resistor is not 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.
- Step 6: Connect Negative to Condenser.
What is the resistance of a ballast resistor?
External Resisted Ignition Coils have an internal resistance of 1.5 Ohms and when combined with the Ballast Resistor you get a total resistance of 3.0 Ohms which is necessary for 12 Volt ignitions systems.
How do you wire an ignition with a ballast resistor?
Route one end of the wire from the engine compartment into the passenger compartment. Strip 1/2 inch of insulation from the end of the wire and crimp on a ring terminal. Connect it to the ignition terminal of the ignition switch. Route the other end of the wire to one terminal of the ballast resistor.
Can you bypass a resistor?
A wire in the left circuit is shorting the 100Ω resistor. All current will bypass the resistor and travel through the short. So typically the assumption of a short is done by redrawing the circuit.
How do you test a fluorescent ballast?
One probe of the multimeter should touch the hot wire connections, while the other touches the neutral wire connections. If the ballast is good, an analog multimeter has a needle that will sweep to the right across the measuring scale. If the ballast is bad, then the needle won’t move.