Recommended 7-Way for a 2006 Tiffin Allegra Bay on a Workhorse W22 Chassis

Updated 05/29/2026 | Published 05/26/2026

Products Featured in This Question

Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires

(3480)

$118.67

Curt Wiring Harness with 4-Pole Flat Trailer Connector - Vehicle End - 48" Long

(5)

$7.67

Question:

I have a 2006 Tiffen Allegra Bay 34 foot RV workhorse chassis. I am in need of the electrical connector harness in the back for trailer towing that can go from my factory plug-in if possible to my seven pin trailer connector. I do have a brake controller up on the dash as well Someone mentioned about a small conversion box that I need so I’m not sure what you may have available that can make my hook up easy Thank you

asked by: Kurt K

Expert Reply:

Hey Kurt. It sounds like you need an OEM wiring harness that is designed specifically for a Workhorse W22 chassis. That's not something we carry and I don't know if one would still be available.

My only solution to adding a 7-Way connector would be to install the Universal Installation Kit for Trailer Brake Controller item # ETBC7. This is not a custom fit option and would also require you to install a 4-way connector like item # C47NR that would splice into your tail light harness.

The Universal Installation Kit item # ETBC7 includes a 7- and 4-way trailer connector that would mount at the rear of your Tiffin Allegro with an included bracket. This kit is designed for use on a vehicle with an existing 4-way flat trailer connector and plugs directly into it.

You will then connect the blue wire to the blue wire on the brake controller after running it to your cab, connect the black wire to the positive post on your Tiffin's battery, the white wire to a suitable ground, and the yellow wire to the accessory circuit. This will provide you with the ability to control your trailer's brakes and also provide you with a 12v power wire for you trailer's battery. This kit includes all the wiring, connectors, and circuit breakers you'll need.

What kind of trailer are you planning on towing?

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