Towbar wiring

[Rversteeg]

In Europe we have seperate pins for brake and indicator lights, as well as seperate pins for OS and NS rear lights.
European trailer connectors used to have 7 poles, which left only one pin for accessories (often 12V acc feed). With the latest requirements for fog lights and reversing lights, the 7 pole connectors are more and more replaced by 13 pole ones.
In the US the brake lights appear to have been combined with the indicator lights, without the need for seperate OS/NS rear lights, fog light and reversing light, so a 4 pole is sufficient.
On the Volvo D5 connector, you can probably not simply combine the wires of the indicator connection with a rear lights. Braking would result in lighting up of both vehicle instrument panel turn indicators and indicating results in the simultaneously blinking of the vehicle brake lights.
Easiest solution would be an adapter. Most adapters work from US to EU, but this is one of the few that works vice versa:
https://www.ebay.ca/itm/383722475024...6BRNE1KPNMTAC3
You can either wire the D5 connector to 7 pole connector and use this adapter, or cut the wires of the adapter and connect them directly to the appropriate D5 pins.