Hello again - Thank you for your reply / info..
I dont know / didnt know what sort of system you have bought see.... some need a perm pos supply - which you can take from the battery as above - and others need a switched supply (ign )
You just said you "want a 12 v signal to arm / disarm"...so I thought you needed a perm pos feed...
If you want a switched one then - then the best
is to take it off the back of the ignition - or fuse box.. All you need to do is use a 12 tester - probed onto the ign wires- Ign on...so it will be live ... then switch off ...when the tester goes off , you know you have a 12v switched feed you can use.
Thats the best way without a diagram - which, as you say, are hard to come by... I dont believe Haynes do them - I know you can get them via MB - but they are expensive! I would just use a 12v tester and trace a feed as above and that will have it done for you....
I hope that helps you further... The other thing as a tip maybe, is to ask the suppliers of the Kit - very often they have diagrams of vehilces to help..... just a thought..
Best Rgds - MIKE..
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Kind Rgds - MIKE