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 - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
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