Just installed a Ham Radio in my 08 Expy. I built a filter to remove alternator whine. It works well.

On the other hand, I get terrible electrical noise for 10 seconds if I:

[ul][*]Put the key in the ignition[*]Open a door[*]Close a door[/ul]
It's obviouosly computer related, I assume.

The computer sees the key has been inserted and starts checking the key to see if it's the correct coded key.
The computer sees the door has been opened/closed and needs to keep the interior light son for X period of time.

After 10 seconds the electrical noise completly goes away.

Any ideas what device might cause this any what wires might need a ferrite bead installed? I hate to go placing ferrite beads everywhere cause I'd probably have to have 100 on hand to cover everything.

Was hoping someone else might have run into this.