Help - Radio Interference
Thread Starter
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4th Gear
Joined: May 2013
Posts: 8
Likes: 1
From: ohio
LED Lights
Thanks Joe, the LED lights are not head or tail lights, they are accent lights to light up the motor & trans. Disconnected them and still have the noise problem.
Thread Starter
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4th Gear
Joined: May 2013
Posts: 8
Likes: 1
From: ohio
Thanks for all the suggestions. Haven't solved it yet. Cass - the noise is present as soon as the ignition is turned on. It doesn't matter if the motor is running or if the switch is in accessory position. The sound level of the noise is constant - doesn't change with motor running or off, in any ignition position. Noise is not affected when the run switch is on or off, and doesn't make any different noise pattern with turn signals. Just a constant noise when the ignition is in any position except off. There is about a 1 second delay when the ignition is activated, almost like something is being energized then the noise starts. That's why I'm suspecting the FuelPak but that is just a guess. Tomorrow is going to be a rainy day, I'll disconnect the fuelpak and see if makes a difference. I'm also thinking of adding a noise filter in the power line feeding the radio but don't really want to start hacking wires on a relatively new bike.
Elite HDF Member
Joined: Jul 2008
Posts: 4,741
Likes: 45
From: Indian Land, SC
Thanks for all the suggestions. Haven't solved it yet. Cass - the noise is present as soon as the ignition is turned on. It doesn't matter if the motor is running or if the switch is in accessory position. The sound level of the noise is constant - doesn't change with motor running or off, in any ignition position. Noise is not affected when the run switch is on or off, and doesn't make any different noise pattern with turn signals. Just a constant noise when the ignition is in any position except off. There is about a 1 second delay when the ignition is activated, almost like something is being energized then the noise starts. That's why I'm suspecting the FuelPak but that is just a guess. Tomorrow is going to be a rainy day, I'll disconnect the fuelpak and see if makes a difference. I'm also thinking of adding a noise filter in the power line feeding the radio but don't really want to start hacking wires on a relatively new bike.
Last edited by HDV-GLIDE; May 31, 2013 at 08:03 PM.
Thread Starter
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4th Gear
Joined: May 2013
Posts: 8
Likes: 1
From: ohio
Problem Solved - with another mystery. THere's a Y harness under the seat that was the culprit. Not sure what it is for but seems to possibly be a sealed resister with 8 wires in and 8 wires out. The quick connectors have a label AMP over a slot between possitions 2 and 3. The sealed box is stamped 4412 - no other markings. 3 dealers couldn't find this on 3 different service appointments. Found it in 10 mins the old fashion way - disconnecting harness connectors. Thanks everyone for all the hints and suggestions. Now back to HF to find out what this nysterious y connector really is and what it's for.
Thread Starter
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4th Gear
Joined: May 2013
Posts: 8
Likes: 1
From: ohio
Answer - if the rear turn signal / running light kit is installed, the module that creates the pulse to turn the turn signals into running lights+brake lights causes the interference in the audio circut. HD's answer is to remove the running light kit and in there opinion problem solved. I said what about the $$ spent for the HD accessory and ther fact that it is a HD kit made for my model. They said live with the noise or remove the kit. Not happy with the answer but at least I know the cause.
Grand HDF Member
Joined: Jan 2010
Posts: 3,514
Likes: 1,992
From: Vancouver BC
Answer - if the rear turn signal / running light kit is installed, the module that creates the pulse to turn the turn signals into running lights+brake lights causes the interference in the audio circut. HD's answer is to remove the running light kit and in there opinion problem solved. I said what about the $$ spent for the HD accessory and ther fact that it is a HD kit made for my model. They said live with the noise or remove the kit. Not happy with the answer but at least I know the cause.
http://en.wikipedia.org/wiki/Title_47_CFR_Part_15
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Tourer
Joined: Jan 2009
Posts: 256
Likes: 0
From: Lehigh Valley, PA
I have a 12 SG with LED accent Lights have no interference with radio. But installed the Custom Dynamics LED turn signals kit a few weeks ago. Now when the signals blink I get the static only in the radio when it is on FM. AM seems ok as far as I can tell. Any ideas how to fix it.
