Adding new decoder to 4-6-0

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I have a Bachmann Texas & Pacific 4-6-0 HO scale locomotive.  I'm in the process of adding a sound decoder.  I'm looking for the wires for the headlight (white and blue).  the wires in the tender are all black.   Would the terminals labeled L+ and L- be for the blue and white wires respectively?   I'm assuming M+ and M- is for the motor.

Dave

[Tenwheeler01]

L+ and L- should match up to Pins 7 and 6 on the NMRA 8 pin plug on the circuit board.  But I always double check with an ohmmeter.  Just out of curiosity way are you not just using the NMRA 8 pin plug? (I have not installed a decoder into 4-6-0 yet.)