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It is a requirement for the instruments to be back lit. Often we hear that the builder forgot to keep the dimmer module if fitted. This can be bypassed. Take the 3 wire plug that went into the dimmer module. You should have
Grey/Red crossed with Black lamps will be on..
Black. crossed with Black is a dead short and will blow fuse
Grey/Red joined with Black will turn the lights on.
Red/Black crossed with Black is a dead short and will blow a fuse.