You check for VOLTAGE (not current). [switch DMM to volts.. not current]
Normal fault finding divides the thing into halves, given
Voltage at battery (+ve terminal)
No voltage at tail/side lights
I'd go for the switch that turns on these lights 9both sides of this switch, while you are there].
If no voltage there then go half way towards the battery .. fuse?
If voltage there then go to the junction of this wire and the two wires for the lights?
And yes you should have a wiring diagram, other wise it will take longer.
Keep dividing it up until you get to the fault it self.
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