2014 Harley-Davidson Street Glide FM Recpetion

I have a customer with a 2014 Harley Street Glide that he had a stereo installed at another shop. They installed 4 speeakers and a 4-channel amp. The amp was mounted behind the ferring to protect it from the elements. By doing so, they placed the amp above the radio. They customer is now complaining that the radio get no local FM stations. The customer is not going back to the other shop because he has had nothing but problems with them since. I've been doing a little research and think that the radio and the amp are creating either EMI or RFI interferece with each other, in turn, affecting thr FM tuner. With that being said and leaving the amp in its current location, I was thinking about using a thin sheet of copper to divide the amp and the radio to eliminate any interference between but I've never tried this before. The problematic area is suppose to be blocked by a conductive or magnetic material from what I have read. I assume thats why headunits were copper chassied on high end head units. Any suggestions or experience with this would be great.I drink current, eat ohms, and bleed voltage

Have you verified the antenna is correctly plugged into the back of the radio? It's unlikely the amplifier is causing what you described. the12volt • Support the12volt.com

I though about that after I finished my last post. I havent pulled the ferring off yet. I've been busy fiberglassing some speaker pods on the bike and the customer approached me with this issue. I was just trying to get a heads up before I dove in and was wondering if anyone else had experience with this.I drink current, eat ohms, and bleed voltage

I'd check the obvious first. Chances are it's as simple as that. the12volt • Support the12volt.com

I'm gonna do that but for me gaining more knowledge in the EMI/RFI area have you ever dealt with the shielding technique I purposed.I drink current, eat ohms, and bleed voltage

Simple test before you take anything apart (no need to have the engine running)... if you can get some FM stations while the radio is on but no AM at all, then it's most likely an antenna issue (probably unplugged). If you get AM and no FM, then there is an issue with the radio itself. the12volt • Support the12volt.com

I'm betting EMI/RFI is not the issue with this one. No, I have never had an issue with mounting an amplifier above a radio causing a decrease in FM reception, and I've done it several times when necessary. the12volt • Support the12volt.com

I may sound like a idiot asking this question and sorry to bug you but, what is the theory behind the FM/AM test. I'm not arguing just interested. Why would you only get FM if the antenna is unplugged and why would you get AM and no FM is the radio tuner bad? Wouldn't you recieve no signal at all if the tuner was bad?I drink current, eat ohms, and bleed voltage

In metro areas, most tuners will receive some FM channels without an antenna, but absolutely no AM channels without an antenna. If you are receiving AM channels, then you know the antenna is connected. Next time you have a radio on the bench or one on your lap while testing before you mount it, give it a try. This obviously does not apply if you're in the middle of nowhere. the12volt • Support the12volt.com

BTW, if you want to know more, you should study the differences between frequency modulation (FM) and amplitude modulation (AM). the12volt • Support the12volt.com