engine noise and indicators

[dub6n2]

why does the exhaust noise change when I switch on the hazard lights or as I can assume any other lights. I noticed that it will lower and increase slightly in volume in synchronisation with the blinkers!!! is it an alternator problem?

[alexperkins]

It's because the alternator is being put under more load and the engine compensates for this

[dub6n2]

so this happens with just switching on some bulbs!! I can't imagine what happens when I turn up the volume high with a less than what I call efficient amplifier and some speakers!! will an upgrade to a higher amp alternator help? Thanks as always Alex

[alexperkins]

Any extra load can increase the alternator demand. It may well be that your alternator isnt running as efficiently as it has been. Get a multimeter on the batter, rev to 3500 and check what the voltage is. Should be between 14.1 and 14.8