Door Ajar indicator flashing and relay electrical rattle

1996 Ford Aerostar 3.0L 150K

While driving there is an intermittant electric rattle of the Door Ajar Replay. The Door Ajar indicator also flashes rapidly and sometimes stays on for a few minutes. Sometimes, but not always, the rattling seems to occur while running over bumps in the road. The relay responds correctly to open doors.

Pulled Fuse #6 which controls relay only to have the indicator stay on constantly; even with all doors closed.

Haynes Repair Manual does not have an electrical wiring diagram for the circuit involved. There does not seem to be any switch on the doors that will activate the relay. The only switch is for the dome light (manual door locks, manual windows, manual mirrors). The dome light switch will turn off the overhead lights just before the Door Ajar indicator turns off when any of the doors are closed slowly just before latching.

I've verified that the doors are grounded to the chassis. Experimenting seems to throw suspicion to the front passenger side door.

How does closing a door activate the relay? Short of a complete answer, can you direct me to an electrical wiring diagram that will include the Door Ajar indicator?

Thanks,

Nick