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Every time I try to use blue tooth for music, I have a high pitched sound coming out of the speakers. Tried using different blue tooth device and it still happened. Doesn't happen when I use the radio or plug my phone in directly. Any suggestions? Have a 2013 G23
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So in 2013 many of the head units used in boats didn't have Bluetooth access embedded. As such separate Bluetooth adapters were added to the head units connected to the AUX port. Is this by chance the set up you have? I ask as any problem determination attempt would need to start with the exact configuration of the device you are looking to trouble shoot.
If this is the case most likely the issue you're having is due to a floating ground potential between the Bluetooth adapter and the head unit. The reason using different Bluetooth devices (phones and such, which I believe this is what you're describing) doesn't change the symptom is because there is an "air gap" (the Bluetooth wireless connection) between the device and the adapter. Once again assuming you have a Bluetooth adapter separate from the head unit, the first place I would look would be where the power and ground are connected for the adapter. Ideally both should come from the exact points where the head unit is getting it's power and ground from. This ties both power and ground potentials to the head unit which should fix this problem.
Another possibility would be that you're overdriving the amp due to the volume of the Bluetooth device (such as a phone) being set very low. In this scenario due to the type of connection (Bluetooth) the output volume of the devices is variable and set on the phone (for this example). If the volume on the phone is set very low you would need to run the amp much higher to get the desired volume/listening level. When you do this you amplify not only the input of the device you want to listen to but also any background unwanted noise the amp may see. That said, based on what you've described this doesn't appear to be the case.
Lastly it could be the connections from the input/output jacks between the adapter and the head unit. This can happen easily in marine environments especially if a low quality cable was used during the installation. This should be easy to eliminate with the use of another cable and an inspection of the RCA jacks on the devices for any corrosion or damage.
If your Bluetooth access is embedded in the head unit, well then never mind all of the above. If that is the case the issue IMO would be in the head unit itself.
From my personal experience, I've typically changed out stereos when they start having issue like this and they're over 5 YO. If this is the original 11 YO head unit it may be time to consider a replacement. If I were trouble shooting this for a friend I would probably be advising the swap out especially if it was using an external Bluetooth device. You don't need to go nuts these days with CD changers or CD/DVD players or even radio receivers in the head unit as almost everyone with a boat owns a smart phone with many streaming options available to them. This makes the option to upgrade even more attractive and affordable.
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