There's a couple of factors that determine that. On older vehicles, very few vehicles needed a powered converter, because the vehicle's electrical system used a large enough wire gauge so that there was excess capacity in the vehicle's taillight circuits that could power both the vehicle taillights but also those of the trailer. However, once the vehicle manufacturers started going with smaller gauge wiring to save the cost of the copper plus the weight, many vehicles no longer had sufficient... view full answer...
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