Mr. Mainstreams

unfortunately do not have a multimeter, neither of the exposed wires seem to be IGN/ACC if any escort owner know a way to get IGN/ACC would love to know

Hey team, Really hungover trying to wire up a headunit in a MK2 Escort in the heat not having much luck. Here are my underdash wires> The black one is actually black/yellow which i thought would be 12V Ignition on? Whats the yellow one up the top? Power? a previous owner has opened up the wire covers. Ive tried yellow from headunit to 12V battery, black from headunit to ground and red from headunit to that black and yellow cable but no dice. Chur