Whirring in the rear!

[CamperBadger]

Hello all,

I park up. I turn the engine off. But in the rear there is a whirring sound. Is it a pump or fan? Fuel pump? Fan built-in to one of the transformers?

Should I be worried.

It eventually stops.

 

[Howzat]

Could be a DC charger? You got a leisure setup?

 

[CamperBadger]

Yes - I have a leisure batt and a switcher that charges it - a fan?

 

[acompta]

The whining stopped in all my vehicles when I got divorced