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Trailer Wiring for 2021 Promaster 2500  

Updated 02/18/2025 | Published 02/13/2025



Question:

Do you have a trailer wire harness product for a 2021 Promaster 2500 for a 6 blade plug? Ideally a 6 blade and 4 wire plug so I don't have to use an adapter.

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Expert Reply:

Hey Mark! Do you mean a 6-way round connector like the picture below? If that is correct, and you don't have any wiring already, you can use the Curt # C58DR along with the # ETBC6 which has a 4-way and a 6-way round.

However, I suspect you actually need a 7-way blade. If you take a look at the other picture below you will see a 7-way with 6 "blades" and then the center is the 7th function. If that is what you need then you can use the #ETBC7 instead of the # ETBC6. If you have the factory tow package you can add a 4-way and 7-way using the # HM40975-11933

expert reply by:
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Robin H
6-Way Round
6-Way Round
(click to enlarge)
7-Way Blade
7-Way Blade
(click to enlarge)
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