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check the inhibitor wiring

its either on the gbox or on the shifter

one wire should have ign power when ign is on

then when its in reverse it should have ign power coming out and this wire should goto the rev lights

so if there is no power coming in then there is no power out

if no power in then u have a blown fuse or a cut in the power wire

i can fix it in 5 minutes but i wont be in qld till end july for a week for work