Hi, I have a very specific question with respect the Glow Plug Relay for MB w123. I am reconnecting the harness to the relay, but foolishly forgot to take pics of which wire shd be connected to which terminal pin on the relay. The glow plugs are fine - I just can't figure where the red, blue, grey and black goes to which pin, terminal 15, terminal 31, terminal 50 or LA. I attach a pic of the relay as well as the 4 wires. Thank you so much.

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