>> This earthing wire is the negative RETURN PATH for the alternator
>> current. Same gauge as the POSITIVE WIRE.
>> Must be capable of sustaining 20-25 amps.
Would someone like to explain this ?
The Rotax Installation manual just shows an earth connection for the
regulator body. No sizes, no critical comment.
There are two alternator wires which go to the regulator. Both are positive.
The circuit is completed via the alternator body and thus the engine earth.
The 12v output from the regulator goes to the positive buss and thence to
the battery plus. From the positive buss all the avionics are connected and
they have earths that meet back at the engine body, as does the battery
earth.
I'm not saying the comment "This earthing wire is the negative RETURN PATH
for the alternator current" is wrong but it doesn't accord with my
understanding of how it works. Can you explain it please ?
>
> Thanks, chaps. With no description of the action of the 'regulator' (which is
> clearly not the same as one for a wound-field alternator), it was not obvious
> whether the return path was via the engine ground or the regulator casing.
TIA
Richard
Richard F.W. Holder 01279 842804 (POTS)
Bell House, Bell Lane, 01279 842942 (fax)
Widford, Ware, Herts, 07860 367423 (mobile)
SG12 8SH email : rholder@avnet.co.uk
Europa Classic Tri-gear : G-OWWW, EGSG (Stapleford)
PA-28-181 : Piper Archer : G-JANA, EGSG (Stapleford)
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