Question about Kenwood KDC-MP435U CD Player

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Illumination v. Dimmer

When I installed my unit in my F150, I found that the truck had two light wires - 1 for illumination and 1 for dimmer. But, my Metra BB-1771 wiring harness only had one wire for lighting. The plastic wire cover said "ILLUM" and the stick-on tab on the end said "DIM". I hooked the harness wire up to the truck dimmer wire. The display now dims when I turn on my lights. But, now I've noticed that the the clock does not display when the unit is turned off (don't turn it off much, so it took a while to notice it). Don't know what it would have done if I had connected to the Illumination wire instead. Is this typical of the KDC-MP435U? Should I have connected to the truck illumination wire instead?

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  • rpurdy Mar 18, 2008

    My problem with the clock is that if the unit is off, even while the car is running, the clock does not display. I can understand it not displaying if the car is turned off, but is it normal for this model to not show any display when the unit is off and the car is running?

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Good day,

The illum wire goes directly to the headlight switch and tells it when to light up, where as the dimmer wire is variable meaning it would dim up or down with your dash light control. Dimmmer is usually only need on factory radio's and not aftermarket. I suggest wiring only to the illuum lead and do not connect dim. Also about the clock make sure your red and yellow wires are not crossed, yellow is a constant hot and red is only hot when the ignition is on, so if they are backwards the radio would loose it's memory when you turn the key off.

Hope this helps

Posted on Mar 12, 2008

  • rayzjauncurr Oct 05, 2010

    Ok I have the same problem.What should I hook the illumination wire up to if there isnt one on the back of my aftermarket deck?Hope you can help and thanks.!

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