I've had bad radio reception in my I signal. Have read a few comments on here regarding chargers plugged in and found trouble is my dash cam power plug in.

I thought I know I have an extension cable which I had to use for blowing up camping bed when camping which I have wired direct to battery and then plugged in my dash cam plug just as you do into cigarette lighter plug trying to avoid going through car wiring. 

Problem still exists if I do that so can anyone help ? 

Is it the dash cam or is it the dash cam cable causing problem

Any help please thanks in advance 

I have used dashcams that have Wifi built in and this has affected radio and satnav reception as it causes interference.
If your dash cam has Wifi capability then switch that function off and see if it has an effect