Can an ignition coil be bad if it has resistance?
Because of their location (often right on the engine), ignition coils are subject to the harsh conditions of high heat and vibration of engine operation. Over time, they can burn out or develop increased electrical resistance that can lead to misfires or a weakened, less efficient spark that will hinder performance.
What does ignition resistor do?
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. This jumper wire provides the necessary voltage to make the engine start.
Why are ballast resistors used in ignition systems?
A Ballast Resistor is an electrical device that reduces voltage to the coil so that more energy is available for the spark plugs during starting. Why would a Ballast Resistor be fitted in a car? Traditionally, ignition systems didn’t use a ballast, meaning…
Why do I need an external resistor on my ignition coil?
Anyone else out there remove theirs using a coil that states that an external resistor is required printed on the front of it? Although that’s not the case with EVERY coil, most do require it. The resistor limits the CURRENT going through the coil. Also, if you have a points ignition, it lengthens the life of the points greatly.
Is there a way to bypass the ballast resistor?
Some customers report that bypassing the ballast resistor by disconnecting the ballast feed wire ( from the starter solenoid or built into the loom) and providing a direct 12 volt feed from the starter solenoid/relay or fuse box to the ignition coil has proved to be a success and has given good results. Loading…
What are the symptoms of a bad ballast resistor?
The most obvious symptoms will be the vehicle starts, but then immediately dies as soon as you release the key. If this happens, the professionals at YourMechanic will be able to measure the voltage coming from the ballast resistor and determine if you need a replacement.
How do you remove a ballast resistor from a ignition switch?
The ballast resistor should have its own secondary wire with a round or U-shaped wire terminal end connected to the positive coil lead stud. Step 4: Remove the wires from the ballast resistor. One comes from the ignition switch while one goes to the ignition coil positive terminal. Step 5: Un-mount the ballast resistor.
What are ignition points and ballast resistor used for?
Today’s vehicles use distributor-less ignition: cam and crankshaft sensors trigger individual coils for each cylinder, compared to one ignition coil and a distributor. Prior to the mid-to-late 70s, ignition points and a condenser were used where now the electronic ignition module and the ballast resistor have taken over.
How to test ballast resistors, resistance and coils?
Ballast Resistors, Resistance and Coils 1 Test procedure: 1.1 Switch off ignition. 1.2 Disconnect all wires from coil (-). 2 Interpreting the results of the test: 2.1 If no significant voltage drop is detected in 1.4, the vehicle does not have a ballast resister. 3 Recommended coils
Where are ballast resistors located on an inline 4 engine?
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.