It doesn't make sense to route the manifold heater through the ammeter, since you wouldn't use it while the motor is running. The purpose of the ammeter is to tell you if the charging system is working, and of course the generator isn't running when the engine is stopped. On the other hand, you DO use the headlights when the engine is running, and it's important to know if you're getting a net charge with the headlights on, so they're wired through the ammeter.
It would be nice to get some positive feedback that the heater is actually working when you hit the button, but the engineer who designed the system probably opted to wire it as directly to the battery as possible to reduce voltage drop. You say it's connected to a 'starter post', I'm guessing that post is actually on the starter solenoid and is wired directly to the battery as well as to the ammeter and manifold heater switch/relay.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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