Retcol said: (quoted from post at 04:49:51 01/07/09) I can tell the difference between a 6 and 12 volt battery. However, it is difficult to determine when there isn't any battery.
The answer is, there is no 100% sure way to tell just by looking, then.
If there's no battery and the tractor was originally 6V, then the best you can do is ASSUME the generator is 6V and go from there. Further research and testing will confirm the generator's true identity.
Having a 6V alternator or a 12V generator on a tractor originally equipped with a 6V generator is extremely rare. The overwhelming majority of conversions were done with 12V alternators because:
1. 12V alternators are cheap and widely available. 6V alternators are sometimes tough to find, and 12V generators are expensive.
2. 12V "solves" the starting problem. A 6V alternator only eliminates the reliability issues of 6V generators.
3. 12V generators have the same reliability issues as 6V generators. Of course the reliability problems are more of a maintenance issue, but alternators are practically maintenance-free.
Tractor owners generally convert to solve two issues, the reliability problems with generator systems, and difficult starting.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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