Awesome News for D Class Amps That Interfere with FM

[Kokes58]

I have a Cerwin Vega B4 and a Cerwin Vega B2 amplifier installed on my 09 Ultra. From the day I installed them there has been interference on the FM signal which I knew was a possibility.  I had order Custom Dynamics LED turn signals and their LED Load Equalizer.  I received them today. In reading the directions for the Load Equalizer I saw a note, "If there is interference on CB or FM stations on touring bikes, move the black wire from the negative of the battery to the right side grounding stud on the bike's frame directly in front of the battery box.". In one of the reviews on Amazon an individual wrote "save yourself time and just connect the ground wire to the grounding stud."  I figured I would try the ground wires from the amps to the grounding stud as well to see if it made a difference on the FM signal. IT WORKED!!!!! I know get a good FM signal. The grounding stud is a little difficult to initially see due to wires being in the way. You have to remove the battery to get to it. Here is the Custom Dynamics Instruction link which has a picture of the grounding stud along with some pictures I took.  http://www.customdynamics.com/instructions/signal-stabilizer-standard-fuse.pdf. One note the grounding stud nut is a 10mm. Not sure why Harley used a meteric size for this nut.  I hope this helps those who are having FM a signal interference.

[UltraNutZ]

Awesome.. thanks for sharing Kokes58!   

[Gannicus]

Potential game changer . . . To echo Nutz's sentiments. Thanks for sharing!

[z71_fourwheelin]

Has anyone else tried it yet?

[UltraNutZ]

I would but I don't even have an antenna cable, let-alone antennae on my bike.   

[z71_fourwheelin]

Same here

[AAWAV]

tried it yesterday - my RZ4 lost just a few stations (I ran thru the whole range with I had the BT2180 hooked up).
Keep in mind I got HD Radio capable HU on my bike.
I lost 94.1, 100.5 and 104.3 with my RZ4 (RUNNING PIONEER Wire Antenna!!!!!!!!) with thre RZ4 and they did not come back with the chassis grounding   
now - I do not care for those 3 stations and in general do not care for FM anyway....

I guess it is a hit and miss here as well... Good for the OP.... 

[Kokes58]

Thanks AAWAV.  I agree I think it will be hit and miss. I know I didn't get back each and every channel but I did get back the big stations.  I have the stock HU. Will be curious as other may try it.

[Bagger Vance]

I'm going to give it a try on my RZ.  The interference isn't too bad now, and I don't listen to FM, but might as well get the FM back if I can.  Thanks for the tip!

[Bagger Vance]

BTW, has anyone tried to run 2 antennas in parallel to try to boost reception?  I have an internal antenna in my fairing and the stock lead is sitting right there even though the antenna is not screwed in at the back.  I could reinstall a stock antenna and lilt it forward under the side moldings and it would not be seen.  I don't listen to FM but thought maybe someone might know and learn something if they were wondering the same thing.

[UltraNutZ]

did the exact same thing with the J&M antenna and the HD antenna and both combined with the stocker actually made it worse in my experiences

[Bagger Vance]

 

[Kokes58]

I have not tried 2 antennas in parallel. However for some reason the previous owner of my bike installed two radio antennas instead of one radio antenna and one CB antenna when he made the tour pak removable.  Since I don't have a CB antenna installed to use the CB, I put TNC to antenna plug adapter on and use the CB coax. I don't know if there is a difference in the standard radio coax and the CB coax, but the CB one seems a little thicker so I'm thinking it is possibly shielded a bit more. I would like to replace the stock coax with heavy shielded coax.  I don't know if it makes a difference or not, but might be worth the try. Any thoughts?

Jerry

BTW, has anyone tried to run 2 antennas in parallel to try to boost reception?  I have an internal antenna in my fairing and the stock lead is sitting right there even though the antenna is not screwed in at the back.  I could reinstall a stock antenna and lilt it forward under the side moldings and it would not be seen.  I don't listen to FM but thought maybe someone might know and learn something if they were wondering the same thing.