What voltage do you see before and after key switch? Also check your EDS switch. FU 3 supplies power to key switch. Remove fuses to check them. As what was stated above, they break and carry power, but won't take the load.
CA 203 on the distribution board pin 1&2 power in. Then TP9 you can test voltage for keyswitch. Also make sure your battery plug isn't melted causing a connection issue.
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