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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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