It's wired across the battery supply between the alternator and the battery.
The symbol is for a 14.5 V bidirectional transient suppressor (what I call a "transorb").
It makes sense.
If the battery is accidentally disconnected from an alternator driven system then , depending on the alternator regulator you can get a big surge in the alternator voltage. (Google "load dump")
When I designed automotive stuff we routinely fitted load dump protection, usually a unidirectional transient suppressor across the nominal 12V supply (like a zener diode but designed for lower slope resistance and the ability to deal with large single pulses).
I've never seen one installed in the vehicle on the wiring harness before - but this is a tractor !
And the symbol was new to me:
One of the symbols shown on Wiki is similar to the one on the mystery part.
It's wired across the battery supply between the alternator and the battery.
The symbol is for a 14.5 V bidirectional transient suppressor (what I call a "transorb").
It makes sense.
If the battery is accidentally disconnected from an alternator driven system then , depending on the alternator regulator you can get a big surge in the alternator voltage. (Google "load dump")
When I designed automotive stuff we routinely fitted load dump protection, usually a unidirectional transient suppressor across the nominal 12V supply (like a zener diode but designed for lower slope resistance and the ability to deal with large single pulses).
I've never seen one installed in the vehicle on the wiring harness before - but this is a tractor !
And the symbol was new to me:
One of the symbols shown on Wiki is similar to the one on the mystery part.
