Had the Montero wired for trailer lights. I took it to a local hitch shop. They tapped into the wires that are underneath feeding each tail light using snap connectors. The driver side tailight has 4 wires feeding it so it looks pretty clean. The passenger side has a bunch of wires. Unfortunately, they had to "probe" each wire to find the correct one. This probing left a small pencil lead size hole in each wire. I got a little liquid electrical tape and covered each spot. Obviously, to get to the wiring on each side they had to pull the wiring out of the plastic sleeve. They recommended leaving the wires out of the sleeve because they tend to hold moisture and dirt. I don't know but I sure don't like all the wires hanging out there. I'm thinking about wrapping the wiring back in a sleeve. I wish there was a better way for trailer wiring but I guess this is about the only way. Now to bolt on the pintle hitch.
Thanks,
Jim
'89 two door v6 auto