installed an old kenwood deck i bought from my friend on friday....tdf 85d if im correct..model before the exceleron models came out i believe....anyhow....there was no dimmer or illumination wires and after i installed it, the visual on the deck is way too dim to see....i looked on the menu to see if i could possibly change the contrast, no luck, no manual, and no wires for dimmer or illumination...anyone gotta clue ?