Best Way To Connect
Updated 02/17/2026 | Published 06/13/2024
Question:
I have a flatbed tow truck with a 4 pin round trailer plug, been looking for a adapter to plug into my 7 pin female plug for my car trailer. Need a 4 pin male plug to go to my 7 pin female plug
asked by: Bill P
Expert Reply:
Hello Bill. I do have a solution for you, but the 4-pin round plug is not common, and we do not have an adapter for a 4-pin male to a 7-way female.
What I would do it wire the flatbed tow truck with the more standard 4-flat plug like part # HM48205. This will allow you to use the adapter # 30717 which will allow you to plug in your 7-way trailer plug. Keep in mind that this will only operate the brake lights and turn signals and there will be no braking capability.
Product Page this Question was Asked From
Pollak Trailer Connector Adapter - Vehicle End - 7-Pole Round to 7-Way Blade
- Custom Fit Vehicle Wiring
- Wiring Adapters
- Universal Fit
- 7 Round to 7 Blade
- Plug and Lead
- Pollak
more information >
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Jesse M.
2/17/2026
Hey Bill, how did things go after you rewired the tow truck with the 4-flat plug and used the adapter for your trailer connection? Knowing how that setup worked could really help others trying to match a 4-pin round to a 7-way plug.