Zac--SRS13

I'm trying to wire up my DEI trunk release solenoid using my Clifford alarm but I'm new to using relays so its confusing me.

My alarm's Aux trunk release wire is a (-)200ma output so just trying to figure out how this will trip the relay when I'm ready relays usually trip with a (+) trigger.

Anyways I've found in another post that you wire it up like this:

85- Red/White (-)200ma from alarm
86- 12v from battery fused
30- 12v from battery fused
87a- not connected
87- to trunk solenoid

But is there no ground? Does the solenoid ground work as the ground?

What what amp fuses do I use for the 86 & 30?

The solenoid comes with a 15amp fuse.

Hopefully someone call please help me out and have done this before