The ONLY thing that runs at less than 12 volts is the ignition coil while the engine is running.
It's wired through a ballast resistor to reduce the operating voltage to 9 volts.
ADDED:
The term also refers to an automobile engine component that lowers the supply voltage to the ignition system after the engine has been started. Because cranking the engine causes a very heavy load on the battery, the system voltage can drop quite low during cranking. To allow the engine to start, the ignition system must be designed to operate on this lower voltage. But once cranking is completed, the normal operating voltage is regained; this voltage would overload the ignition system. To avoid this problem, a ballast resistor is inserted in series with the supply voltage feeding the ignition system. Occasionally, this ballast resistor will fail and the classic symptom of this failure is that the engine runs while being cranked (while the resistor is bypassed) but stalls immediately when cranking ceases (and the resistor is reinserted in the circuit).
Modern electronic ignition systems do not require a ballast resistor as they are flexible enough to operate on the low cranking voltage or the ordinary operating voltage.
http://en.wikipedia.org/wiki/Ballast_(electrical)
2007-07-05 11:50:53
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answer #1
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answered by Mr. KnowItAll 7
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Mr. Knowitall was pretty correct except the ignition circuit in those years did not have a ballast resistor--like Chrysler's--- but had a resistance wire.....same effect as a resistor though. This was done to make the points last longer. Some hyperf coils like Accel or Mallory require you to add a ballast resistor in the circuit because of the higher voltages that will burn out the points prematurely.
2007-07-05 12:47:03
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answer #2
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answered by paul h 7
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if your 327 has a newer HEI ignition distriburator added to it and you have it wired to that small resistor wire that went to the old distriburator then yes, it's wired wrong, you need to run the battery wire that plugs into the distriburator to a 12 volt source in the fuse box that gives you 12 volts all the time when the car is running. The HEI will run on 9volts but no correctly.
2007-07-05 12:13:42
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answer #3
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answered by mister ss 7
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2016-05-19 01:43:25
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answer #4
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answered by Anonymous
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