I can't for the life of me find a relay or wiring for an electrical motor for my rear mounted antenna. I presently have a manual antenna back there, but want to consider mounting a motorized antenna. Anyone aware of where this relay might be mounted. It's 186 in the below diagram.

 

Bill,
if it is the Delay relay as in the Series 3, it is a light green, tall, relay.
David should have them, if not, I have two.

 

And the green aerial relay in the Series III is found in the boot/trunk at the outer edge of the spare wheel well.

 

Mounted one in my coupe last year. Not the original, but same part number - AEU 1648., Had to come from UK. No delay relay installed, so to prevent untimely deployment as soon as the ignition is turned on I fitted a defeat switch hidden in the ashtray ( Jagaire air con set-up comes with a switch panel for mounting in the ashtray which has a switch available labelled power arial) Without this or the delay relay, the arial will raise when you may not want it too - like when there's a cover on the car, or just going up and down repeatedly when keying the ignition. The antenna has a built-in relay (not the delay relay though)