The best short term advise is to tap the Red/LT Green wire that supplies power to the ignition coil.
If you are familar with how to wire relays, make another post & I will give to some ideas on adding another fused circuit that only comes on with the ignition switch.
Originally copied from the same source, Jrichker.
Hope this is the diagram you wanted. Anytime I see a helpful piece I save it to my computer for future reference.