M20B25 Cold Start Relay (the 4th Relay)

[4tDX]

I have a 1987 m20b25 with the 3-pronged (black head) coolant temperature sensor and a 4th relay that sits next to the main, fuel pump, and O2 relays.

From what I've read this is a 'cold start relay' that was retrofitted to some m20s with cold start issues.

My question is where does this relay get signal from. The one note I found is that it get signal from the starter so that it is only activated when the starter is turning over, but I can't find any wiring diagrams to verify.
Can anyone else verify they proper wiring of this relay - 1 black and 1 red terminal.

Thanks!

[nando]

Unless it's a grey market car, I don't think any M20B25 ever came with such a relay. If it's a "4th" relay I'd be willing to bet somebody added it on for some hack job repair.