Bit of late night shed and beer action.
Thought I'd make a trailer light tester, so it can be a 1 man job to check them.
Had a pile of switches and trailer plugs lying around, along with a roll of 7 core cable.
Grabbed a 10amp breaker and jiffy box from Jaycar. Also pulled apart one of those cheap cordless airbed pumps for its 1.3ah battery and charger.
Bit of drilling, cutting, stripping and crimping.

Hot glued in a plug for the ac charger.

Wired in 6m of 7 core cable with a 7 pin flat socket. I'll use an adapter for round plugs.

Tried to colour code the switches to the wiring. Top row for the lights. Bottom row for electric brakes and auxiliary / reverse (red). 10amp circuit breaker and the black switch for power on/off.

Just need to find the dymo machine to add some labels.
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