You are getting noise, (voltage spikes) on the power line to the
    radio. You need to add a L/C filter. This can be found at your
    locate Radio Shack store. Before you go find out the power
    requirements of the radio.

            Joe Wagner

On Mon, 21 Jul 1997, W. Silva wrote:

> We have exact same problem in our '85 Westy.  We too have a replacement
> (Panasonic) radio/tape player installed by the PO.  As you say, on AM when
> the heater fan is on you get static but what even more strange is if we
> turn on our headlights ( we always drive with them on in the day too) it
> stops the static.  Go figure!  I'm interested in seeing what the "fix" is
> for this.
>
> Wendy & John
> '85 Westy,   "S-CAPE"
>