Contrails ! Connecting Rotax 91X mags
Where do I connect the mag P leads ?
The newer Rotax 91X engines have changed, and Rotax no longer uses bullet terminals for the magneto P leads ("kill wires").
Unfortunately the modification doesn't clearly appear in the Installation or Maintenance manuals...
The older style connector
Bullet crimp terminal
In older engines, Rotax used a bullet style crimp terminal to connect each magneto to the keyswitch.
The new connector
Six-pin connector
No more bullet terminals, but a six-pin connector for each mag.
The empty housing is where the wire from the keyswitch is to be inserted.
How to identify it
Each Rotax ignition module has two similar connectors.
To avoid mistakes : the magneto "kill wire" terminal must be inserted into the connector with one red wire, two blue/yellow and two white/yellow wires.
Crimp terminals
Rotax supplies a small hardware package including starter contactor nuts, washers and nylon cover, clear plastic connector and crimp terminals for the tachometer connection.
The Faston terminal is for the starter motor relay command wire.
In the center of the picture, the small silver crimp terminals and black round plastic grommets for the magneto wires.
Do not forget to put the grommet on the wire before crimping the terminal !
Example schematics
Here is an example of how the keyswitch and magnetos may be wired on a Rotax 912 S.
To learn more
Rotax documents
Service Instruction 912-13/914-16 : Standardization of the Rotax ignition unit (750 kb)- Rotax P leads (291 kb)
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28-12-2013 @ 23:01:27
