Parts Needed to Activate 12 Volt Charge Circuit of 7-Way on 2022 Tiffin Wayfarer on Sprinter Chassis

Updated 04/28/2025 | Published 01/08/2024

Products Featured in This Question

Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers

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$58.96

10 Gauge Wire - Blue Primary - Per Foot

(104)

$1.79

40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

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$9.85

Question:

Hi there, I have a 2022 Tiffin Wayfarer which has the Mercedes Sprinter Chassis. I have found that the 7 pin is NOT charging my towed car. We towed the same car with another RV which keeps the towed vehicle charged, so we know this problem has nothing to do with the towed vehicle. Is there a install Kit that would result in the 7 pin charging my tow vehicle? Thanks,

asked by: Chris T

Expert Reply:

This is a pretty common issue as the 12 volt accessory/charge circuit is not always active on vehicles with OEM 7-ways. The solution is to run 10 gauge wire like part # 10-1-1 (sold by the foot) through a breaker like part # 9510 between the 1:00 pin of the 7-way and the positive terminal of your Sprinter battery.

expert reply by: Jameson C