The correct powered wiring harness for your 1985 Peugeot 505 sedan is the Curt Powered Wiring Harness, # C59496. This is basically the same wiring harness as the # C56175 that you referenced except it has the additional power lead for the vehicle battery.
The # C59496 is the harness that I would recommend for your vehicle. Using a powered converter box will keep the additional power draw off of your vehicles tail light circuits and will provide more power for trailer lights. This kit... view full answer...
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