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As I'm sorting out my new (used) '03 DL1K, something I have noticed is that the high-beam modulator is causing the fuel pump to modulate as well.
I can't imagine that's too good for it.
When I switch to low beams, the fuel pump sound goes back to a steady whine.

I'll be checking out the install of the modulator to verify the wiring, of course.
Anyone else notice this effect?

Any recommendations?
 

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One fix is to install headlight relays (eastern beaver). Going through the electrical system and cleaning switches and connectors is also a good idea.
 

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Doesn't sound right to me. Failing stator or R/R? Bad battery? Stick a voltmeter on it for your next ride.
 

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As stated above I would take a hard look at the battery and charging system.
 
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