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The pickup coil is located under the right front cover. Just follow the wire from there up to the wiring harness and you'll find a two-wire connector plug.
The pickup coil is a constant-energy device that isn't directly affected by idle speed or battery voltage. It always produces a pulse but the amplitude and duration of the pulse vary with rpm -- higher rpm, shorter, higher-voltage pulse.
The failure mode on these is thermal. It heats up, an internal connection opens and the ignition shuts down until the part cools and the connection remakes itself.
It's possible that there are shorted turns in the winding and a reduced output voltage, but improbable that it would cause stalling at an idle. The pulse is processed within the ignitor where there's a regulated voltage as a reference, so if the pulse amplitude was low the bike wouldn't start at all.
Likewise, an intermittant would cause misfiring at all rpm ranges.
The pickup coil resistance should be 530 ohms +/- 10% when you check.
I just took a quick look at the mounting on the igniter and don't have a clue how it comes off! I checked Haynes and the Triumph manual but found nothing there.
Jim
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