How Do You Hook Up A Tekonsha P3 To A Volvo Semi With A 7-Way Round Plug

Question:

How do you hookup a P3 from a Volvo semi 7way round with air brakes to a electric 7 way blade tandem axles horse trailer 12000 lbs?

asked by: Kenny F

Expert Reply:

The best way so hookup a P3 # 90195 to a Volvo semi is to wire the semi with its own separate 7 blade connector. For that you can use the Tekonsha # 119250KIT and the Universal Install Kit # ETBC7. This will include all of the components needed to wire the 7-way, including all of the necessary wires for the P3 brake controller. The # ETBC7 kit comes with 25' of wire, for a semi you may need additional wire, and for that we sell wire by the foot with part # 10-2-1.

I have linked a few install videos below, as well as some install instructions and a diagram that you may find useful.

expert reply by: Jesse M

ETBC7 Diagram
(click to enlarge)

Ken F.

4/3/2024

I ordered and installed parts suggested. On the Volvo v13 semi 2017 model I get a dash warning— brake malfunction— it goes off after I apply turn signal and apply brake pedal, then it comes on again after a little while. Suggestions?

Jesse M.

4/4/2024

@KenF Not really sure why you would be getting an error code since the wiring you installed basically bypasses all of the wiring on the semi. The only possibility would be a problem with your connection to the brake switch. We do not have any literature that tells us exactly what this brake malfunction message means though. I suggest you run that by a Volvo dealership.