24 replies to this topic

[unburntfuelinthemorning]

See if this helps

 

 

 

[Sam Biscuits]

Thanks guys, will get back to it tomorrow. Anyone know if there should be a ground attached to a bolt on the left side of the alternator? It looks like there should be but there isn't.

[unburntfuelinthemorning]

The alternator earths through the engine block.

[panky]

How about taking the fan belt off so the alternator is isolated and do a (very) quick run. If the noise goes then there's the culprit.

[Sam Biscuits]

I put an iPod in to the amp input, noise still present, so that rules or the head unit and the RCA cables. I can hear the noise on the speakers on the alternator when running, should it run silently? Too much tension on the belt?

[viz139]

Belt tension and alternator bearings are mechanical noise you hear at the engine . The next thing I would do is run the engine without the alternator connected to ensure the interference isn't coming from the ignition. If it is clear and you have already changed the amp I would look at replacing the alternator. 

[Sam Biscuits]

Ugh, I hope I don’t have to replace the alternator, it’s less than a year old and probably has only done a few hundred miles! I will run the engine without it and see how it sounds.

[Sam Biscuits]

Finally figured out the problem with this, turns out it’s been the head unit all along. Put my original head unit in, no noise anywhere. So to fix it , it’s either a new wiring harness (old head unit has different socket which I plug in to am adapting harness to then plug in to the new one), or I will try and ground the RCA sockets on the back of the new head unit. Grounding the sockets won’t look pretty, but it’s only temporary until I get around to getting an Apple Car Play head unit.

[unburntfuelinthemorning]

Glad you're getting somewhere with it.

[Sam Biscuits]

Fixed it at last. Turns out grounding the RCA sockets on the head unit was the answer.