Need to know what year the vehicle is and is it still a points car or is it electronic ignition.
The purpose of the ignition coil is to take the low 12 volt current from the cars battery/altenator and convert it to 20,000 volts (or more) so that the spark plugs will ignite the fuel/air mixture in the combustion chamber of the engine.
within one volt above or under battery voltage
Yes definitely it is necessary because when u crank the engine at that time ignition coil is in cold position so at that time complete 12 volts bypasses the ballast resistor but when u releases the key from cranking position so the key comes to the ignition position at that position 12 volt of battery goes through the resistor that may be approximately 9 volt because when engine starts the coil temperature increases and there is no need of 12 volts
They are run on the vehicles 12 volt dc electrical system.
The most likely cause would be the stator assembly. By disconnecting the cannon plug for the key switch harness, at the engine, you can isolate the problem to the engine, or the ignition switch / harness assemblies. With the harness disconnected, spin the engine over with a starter button, connected to the solenoid. If the engine now has fire, the problem is in the ignition kill circuit, (ignition switch, emergency kill switch, or harness assembly). If a no fire condition still exists, the problem is in the ignition system, on the engine itself. The stator, and related ignition components can be tested with a volt / ohm meter.
12 volt. side post
The Thunderbolt ignition is a 12 volt system.
Ignition control signal high volt
Yes alot of alarm system disable the ignition one way or another some by turning of the 12 volt to the ignition some by killing the 12 volt to the starter motor.
12 volt
There are a number of things that would make a volt indicator light to come on in a 1998 Buick la Sabre. The main reason is voltage feedback or a problem with the alternator.?æ
The 2014 Chevrolet Volt's engine produces 273 ft-lbs. @ 0 rpm.