Truck Stop Funny

Actually you reverse the RFG to find this
issue.The driver in question refused the advise given early.
Instead chose to to tear everything down chasing his tail.
Putting the radio on a bench will not
correct this

 

With the coax and mic unplugged from the radio,everything known was powered down,nothing running,not even the motor.

Full scale static to 30lbs,rolling off the RFG
decreases static on scale to zero at off position.

 

With shops that are experienced with
hot rod exports and correctly tuning them
this never an issue when installed/installing
in a big truck.

Again it's a ground issue,but specific so:"

 

Guess the "S"perts ain't gonna touch this,so . . . .
Grounding a "fine tuned" export improperly(very commonly advised on this forum)directly to the battery and or the stock power lugs will set these rigs to humming like mothers little helper.

NEVER GROUND A RADIO OR AMP BACK TO THE BATTERY!

You must "chassis ground" these units due to their sensitivity
If you do not ground outside the chassis loop you will not correct nor have optimal performance many units are capable of.
Double/Triple Daisy chain type grounding set ups usually compound the issue
(Using shielded wire for grounds is like adding an RF antenna for every leg run/used)

Average late model Class 8's have no less the 7 separate EMC type controllers on board,every aspect of build construction is modular which includes all power and mechanical limiters/monitors.All trucks have two on the speedo cluster alone.

Which one is it? without running an isolation/elimination test(tearing the truck apart)
on each ECM to determine which of the 4 most likely causes the issue,it just simpler to ground outside the loop.
Regardless of what "Homers Happy Home",Ham/CB repair manual
or favorite golden screwdriver tech shop says.

I fixed the clowns radio in less then 3 min with 2' of 12ga and a 3/8 ring connector.
Pulled the top bolt from the grab handle on the right A pillar,slipped the connector over the bolt and run it up snug,then twisted the other two ends of the wire and left'em hanging.FIXED!

He cleaned up the install and later said it never sounded better,then apologized for not taking this simple route when it was first offered some 4 hrs prior.