Good morning 777, BY DESIGN high currents such as what a starter draws or possibly manifold heaters or glow plugs (if so equipped and designed that way) DO NOT PASS THROUGH THE AMMETER. The way a typical ammeter operates is:
SUPPLY SIDE wires to the battery so selected loads (lights ignition accessories etc) receive power and often the BATTERY is the ONLY thing wired to the SUPPLY SIDE of an ammeter. Often instead of the ammeters SUPPLY side being connected direct to the battery, it wires to the INPUT side of a starter solenoid or switch where the big battery cable attaches.
LOAD SIDE feeds low current (NOT starter or heaters or glow plugs possibly??) to accessories, lights, ignition etc PLUS the output of a generator or alternator
SOOOOOOOOOOO YESSSSSSSSSSS based on how it was designed and wired ?? high current devices like manifold heaters or glow plugs would NOT show up on the ammeter.
The ammeter will register and indicate the + charging current INTO the battery or the - discharging current OUT OF the battery.
If a good charging system is working at fast RPM battery voltage should rise to at least 13 up to 14 or so SUBJECT TO BATTERY AND VOLTAGE REGULATION. If it never rises shes NOT charging or else its 100% charged and/or the voltage regulation system causes such
To see if depressing the heater button sends voltage to the heater, place a volt meter or test lamp on the heater input and see if voltage goes from zero to 12 when depressed. With a heater solenoid button depression activates the solenoid causing a click and closing the circuit so the heater receives power REGARDLESS if any current is shown on the ammeter if the heater circuit DOES NOT pass through it. Thats an easy test with a meter or test lamp.. IM NOT SURPRISED if a heater does NOT pass its current through the ammeter
Perhaps AND I SUSPECT the manifold heater via its solenoid receives its power off the starter solenoid INPUT which is connected to the battery via that huge cable !!! If so its current draw DOES NOT pass through the ammeter...
Best wishes to you and all here, hope this helps, post back any questions
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