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The firewall side where it says trailer that's my 7 wire to the trailer going into that loom protector.
This is the American version of protection for comparison and discussion.
This is the front and back of peterbilt fuse panel. Only 3 relays total. They separated the headlights and relayed those and the horn. PERIOD. Even the power for the marker lights, trailer included run right through the switch on the dash. Blower motor spade fuse and through the switch on the dash. A/C clutch spade fuse and through the switch on the dash.
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As for towed electrical protection all trailers all have a female receptical like this one that house 7 circuit breakers.
This represents decades of production.
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