Dapol Junction Signal LED Connections?

[Isambard Kingdom Brunel]

I have just bought a 4mm Dapol Junction Signal from DVV Supplies which is being sold as Grade 2 for £18.00 inc Postage. There is no Servo box included. I have sorted it with two Tower (G servos, but, I cannot get the LED to light. On the bottom of the signal there are three contacts , one common and one each for each LED.

Two possibilities, (possibly more)

1. They are broke

2. there are some gubbins in the servo box to reduce voltage from 12v

I'm not too worried as I have already powered two single Dapol signals with a servo and fitted them with Modelu Signal lights containing 1mm LED, however it would be easier if I could power the existing LED, does anyone have any ideas?

[RailWest]

2 hours ago, Isambard Kingdom Brunel said:

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...or perhaps you just got the polarity the wrong way round? After all, they are Diodes :-)

Edited November 22, 2023 by RailWest

[Isambard Kingdom Brunel]

1 hour ago, RailWest said:

...or perhaps you just got the polarity the wrong way round? After all, they are Diodes :-)

Thanks. I did think that and did swap the connections over still no joy.