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Loud noise from sub's when Fan turns on

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Loud noise from sub's when Fan turns on

(Snappa) wrote in message . com...
What fan?

The Fan I am referring to is the engine cooling fans!

Alternately, you may consider that one of the fans has developed a
loose/burnt/defective winding, leading to excessive EMF noise
generation. Does the sound go away only when you disconnect the fan A
or either fan A or B? If the noise goes away when you disconnect fan
A, but not when you disconnect fan B (fan A reconnected, of course),
then possibly you have isolated the "bad" fan. If the noise goes away
when either fan is disconnected, then maybe this is an excessive
(relatively) current draw that is exacerbating a problem in the
alternator or internal rectifiers (of the alternator)?

I had an electrical whine that corresponded to when I turned the air
vent fan to med or hight once. The problem has since disappeared, and
I have no idea why. It could return someday, as well. Hope it
doesn't, though... [knocks on wood]

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