This is an excellent theory, except for one point in my case.

The noise picks up in a matter of perhaps five seconds after the motor catches and I remove my hand from the key. I recall hearing the GP relay click a good 15+ seconds after the light goes out normally. I'll try and remember to double check, but I'm pretty sure the GP's are still on when mine gets noisier.

But it's a fine theory, may well be the case.

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K