The relay isn't in the standard place for an Amazon (which is on the OS wing under the bonnet), it is pushed up behind the dash just above the OD switch. The relay is a lighting relay from a 240. I really wanted the proper OD sequencing relay and planned to connect it instead of the headlight flasher, but never managed to get hold of one.
I also have a vague memory that I chose not to wire it in the standard way (i.e. not in accordance with the Volvo wiring diagram) - IIRC the inhibit switch and the OD engage switch both act on the relay coil (rather than having the inhibit switch break the solenoid connection) as I felt this was better practice as the D type solenoid is quite power hungry. You may even find the inhibit wires are already in position just shorted out, I can't remember (it was over ten years ago).
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