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Cucv - Steel Soldiers::Military Vehicles Supersite start with the -20. It sounds like you have lost the 12v feed to the relay.

Download the TM and go through the troubleshooting. You are feeding + 24v to the ground wire of the control card and I assume it is grounding through the + 12v feed. The card is bound to be bad. If grounding the blue wire at the relay with the key on does nothing then you need to find out if...

That is normal for a bad control card. :grin: The relay is triggered by the control card completing the ground to the light blue wire. The plus wire stays hot all the time. Since it is just an electromagnet it will show 12v at both posts. You can hot wire the relay by jumping the light blue...