Electrical Buzzing Sound

[SuperRedMR2]

This has been a problem for a while now.

I have an electrical buzzing sound coming from the right hand side of the engine bay. I've replaced the battery, alternator and the wiring loom in the last year.

Both the battery and alternator were brand new.

It doesn't seem to increase in RPM but it does go away after a while. When it goes away the engine bay cooling fan light comes on, on the dashboard.

Has anyone had any issues like this before?

[pistol pete]

have you checked than fan works? spun it to ensure its free. it may be buzzing as its trying to turn/work and it can't

[SuperRedMR2]

Hi Pete,

Yes the fan works fine.

I've tested the battery voltage with engine off and on and its 14.5 charging and 12.9 normal.

However if I remove the round plug on the alternator the noise goes away...

But if it's charging fine what could be wrong with it?

[pistol pete]

Hi Pete,

Yes the fan works fine.

I've tested the battery voltage with engine off and on and its 14.5 charging and 12.9 normal.

However if I remove the round plug on the alternator the noise goes away...

But if it's charging fine what could be wrong with it?

then it will be some of the voodoo rectifier inside the alternator buzzing i'd expect