Just purchased a cheap AAH-OOH-GAH horn for my mini. Came with zero instructions on how to install it also. Says its for 12V 3A power so hope this will work. Has a red and black pos and neg cable and one nut and bolt. So first question. Where do I wire it to and were do I mount it? Has anyone installed one of these ebay horns? Will prob try on weekend but would like some advise before.

cheers, btw its for 98 rover cooper

Take the existing horn out, cut the plug off the end and crimp on new suitable insulated spade terminals. I think purple wire is positive.
Mount the horn anywhere you can - your engine bay is pretty full.

I mounted mine on my old 93 rover mini in the drivers side guard.. After i ripped the aircon out.

No space in my 97 rover but i have a Klaxon waiting to go in the moke.

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Current: 1970 Mini K 2014 Focus ST
Past: 93 Rover, 64 850, 97 Rover, 66 Deluxe, 66 Moke
81 Austin Estate, 2006 R53MCS, 66 Deluxe, 1978 Clubbie
2014 Land Rover Defender 90

Plenty of room in a 97 - I've got twin magnums in there.

Or if you want to do it properly use the existing horn wires to trigger a Relay. Feed the relay a decent 12 volt supply (Fused) and take the horn power from the relay it will work better and will not melt your horn switch.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

98 model minis were like that from factory.