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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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