In order to install a trailer brake controller like the excellent Prodigy P3 # 90195 in your 2002 Mitsubishi Montero Sport you will need an installation kit # ETBC7 and if you don't already have a 4-pole flat wiring harness on the Montero, one of those as well.
If you need a 4-pole harness you can use kit # 119178KIT from TowReady; I recommend this kit because it includes the circuit tester required for identifying the wire functions on the Montero. I have linked for you a video showing... view full answer...
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