Re: 1972 454 utility 12v had a 6v coil?

Posted by big fred on May 14, 2005 at 17:09:25 from (65.219.141.162):

In Reply to: 1972 454 utility 12v had a 6v coil? posted by n8terry on May 14, 2005 at 07:02:49:

The idea is that they used a ballast resistor. The ballast resistor has lower resistance when it is cold, so when you first start it, the coil gets somewhere between 6 and 12 volts, for a hotter spark, but after the engine starts, the coil receives only 6 volts, for longer coil life. That was pretty common for tractors, trucks and cars in the first decade or so of using 12V systems.

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