Hey mate,
No that ain't your pulse generators, your correct that it is your range switch. Can't say I've ever heard one ticking but that may be because i just didn't pay attention. Is this something that has just started happening or something you have just noticed? Does it sound like a relay ticking, light and fast, or more of a heavy metal tick?
Personally wouldn't be too concerned, plenty of ticks and stuff from various parts with ignition on.
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