I recently purchased a trailer wiring kit from etrailer.com (part number 118538). It is the same trailer wiring kit that
@FJ73Texas used in his HZJ77, but unfortunately the Prado appears to use a different connector for the tail lights. The connectors in mine are slightly smaller and have a totally different clip system. I haven't been able to find any wiring kits that have the same plugs as mine, so I'm thinking I may just have to cut and splice. If anyone has a good way to look up the part number for the plug and cross reference it to see if there are any other common Toyotas that use it that would be great; I haven't been able to find part numbers for individual wiring plug parts.
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