08 Expy - Electrical Noise in audio system

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08 Expy - Electrical Noise in audio system

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Ford Forum >> Ford Trucks, Ford Vans & Ford SUV's >> Ford Expedition >> 08 Expy - Electrical Noise in audio system

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08 Expy - Electrical Noise in audio system - 9/28/2008 5:46:34 AM

camphill

Posts: 1
Score: 0
Joined: 9/28/2008
Status: offline

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:

Put the key in the ignition
Open a door
Close a door

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.