Re: Re: Six or Twelve volt

Posted by John on March 08, 2001 at 12:15:35 from (208.0.20.140):

In Reply to: Re: Six or Twelve volt posted by John on March 08, 2001 at 09:13:12:

Here is what T.W. Cook has to say on this subject.

6 Volt or 12 Volt?

The most frequently asked question is "how to I convert my Farmall H to a 12 volt electrical system?". My answer to this question is always "Why?".  These tractors were designed to start perfectly well on 6 volts, and will today if you have proper cables and a good battery. The first thing to check is battery cables.  The reason manufacturers went to 12 volts is not that it starts better, but that it will work fine with thinner cables which cost less. Many Hs through the years had their cables replaced with thin 12 volt cables. If you have these, you need to throw them away and replace them with big 2 gauge or better cables. Make sure that your ground cable (remember, the H has a positive ground system) goes directly to one of the starter mounting bolts and makes good connections on both ends. The make sure that the cable from the battery to the starter switch and on to the starter is also good. If your starter switch gets hot when you press it, consider replacing it too. If you have good cables and a good battery, it'll start right up. You should be able to get proper cables at Case-IH or Tractor Supply or similar places. If all else fails, get some 2 gauge welding cable and make your own, it isn't hard.

Besides there being no good reason to do it, a 12 volt conversion will reduce the value of your tractor to a collector - it won't be original any more.  If you go with an alternator, you'll have to fabricate a new mounting bracket because it won't fit under the hood any more (whatever you do, don't cut the hood!). So it will be glaringly obvious that it isn't original, and worse, the alternator will be sticking out to the side where it isn't protected from rain.

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