I am not trying to argue but I am pretty sure the resistor has more to due with the dwell time of the coil than it does wih saving the points. The problem arose from the coil becoming "overcharged" and therefore overheated by a log dwell time at idle especially with 4 cylinder engines where there was more time between each ignition event. The problem was still apparent in 6 cyl and 8 cyl engines but it was most pronounced in 4 cyl applications. To solve the problem, it was much easier to just cut the voltage down from 12 to 6 to reduce the "overcharge" effect of a long dwell time. I always hear people talk about burning points up faster with 12v systems, but it's not the points you should be worried about, it is your coil that is really taking the abuse, especially with low RPM tractor engines. And really there is no need for 12v on a tractor system that was designed for 6v, there is more than enough dwell time to recharge the coil on these old engines, it would be different if they were turning 6K RPMS but most are turning less than 2,000 so running 12v to your coil (except when a 12v coil is used) is just wearing your coil out faster, and making it perform worse than what it would at 6v due to the increased heat. If no one believes me that is fine too, I am sure there is someone out there who has been running for years with a 6v coil at 12v with no resistor.
This post was edited by ih560 at 06:58:24 05/02/09.
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