Electrical Interference

Magnum makes a noise supressor. I had kinda the same problem untill i installed it. problem gone!!!

 

Try running your power and ground for the radio direct to the trucks batteries..

 

thats not good.....try a noise filter like was suggested above, I have never had any luck with them though..

 

Hiya.
I answered an identical thread about six weeks ago with lotsa details about how to determine how the noise is entering the CB and where to go from there. In brief, if you can take the coax connector off the back of the radio and the noise goes away, then no amount of power line filtering at the radio is going to fix it, as the noise is being transmitted like a low power radio signal. In that case, and since it's a company truck, ask the mechanics to install bypass capacitors right at the DC input to the wiper motors. So-called "RF noise" must be suppressed at its origin.
You may also find that the windshield washer pump does the same thing, and the fix is the same. It's commonly found anyplace where sparks occur, like on motors that have brushes.
If I were a little more familiar with this forum's format, I'd find my original (similar) replies to someone and link them here, but I've summarized it in this post.
Hope that helps,
-- Handlebar --

 

Click on you username in the top right of the screen and that will take you to your profile. Click on statistics, then click on find all posts by ( Insert your name ) and then you can look back at your previous posts by the most recent first. Hope this helps.

 

I already looked there, and it only goes back three weeks, the posts he is thinking are farther back. It only shows the last 100 posts.