Take your seat off and use your battery in a process of elimination.
Connect any two wires to the battery until you get a light. One of those wires will be your ground.
Combine one of those wires with the remaining wire. If no light, the other one is your ground.
Then it's just a matter of determining which wire is tail and which is brake. The brighter of the two of course is brake.
Connect any two wires to the battery until you get a light. One of those wires will be your ground.
Combine one of those wires with the remaining wire. If no light, the other one is your ground.
Then it's just a matter of determining which wire is tail and which is brake. The brighter of the two of course is brake.