Constant electrical noise

[Robjew]

There is a constant electrical whine noise coming from my 2007 aygo. 

Pulling the 15a fuse that powers the radio etc... under the bonnet stops the noise but also stops lots of other things working. 

Any ideas where to start to resolve this. It is causing a Battery drain so have to keep topping up the Battery.

[flash22]

What sort of sound is it ? what 15 amp fuse what is it marked as ?

[Robjew]

High pitched electrical noise. 

Fuse covers:

Gauges and meters, interior light, audio system, tachometer

(I think) 

[flash22]

No. 15 - 15A Dome fuse under the bonnet ?

Does the interior light work? Both head lamps work in low and high beam ?

[Robjew]

5 minutes ago, flash22 said:

No. 15 - 15A Dome fuse under the bonnet ?

Number 10 - 15A DOME fuse yes. 

[flash22]

Standard or aftermarket radio ? with or without bluetooth ?

[Robjew]

1 minute ago, flash22 said:

Standard or aftermarket radio ? with or without bluetooth ?

Standard radio, no bluetooth

[flash22]

i would start with the radio remove/unplug and see if the noise/draw goes away

[haelewyn]

Does the sound come out of one of the Speakers or from the radio area / from under the dash ?

Good idea to take current off on the radio as flash says..

[Robjew]

Will try this shortly 👍

[Robjew]

It's not the radio... 

[flash22]

Well that's one thing off the list - next up, disconnect the rev counter if you have one or pull the fuses around the dash one at a time if you haven't already - how old is the Battery ? A weak or dying Battery can make the electronics do strange things like turn the lights on

[Robjew]

Each fuse removed around dash, no change at all. 

[Robjew]

Found the source! 

A box in the drivers side A piller with RS Connect written on it! 

Now, anyone know what this is? 

[flash22]

It looks like an insurance black box/tracker, how long have you owned the car ? Fitted 05/08/20 so not that long ago

follow the wiring, you may find a fuse and relay taped up

 

[Robjew]

6 minutes ago, flash22 said:

It looks like an insurance black box/tracker, how long have you owned the car ? Fitted 05/08/20 so not that long ago

follow the wiring, you may find a fuse and relay taped up

 

Only just bought the car, purchased for a friend. Guessing you are right about the black box. I have unplugged and all is good! 

[Robjew]

Thanks for all your help guys, much appreciated 

[Cyker]

Good detective work!