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Discussion Starter #1
does anyone know if i can use the Metra 70-7903 wiring harness for aftermarket HU on 2010 mazdaspeed non-bose? thank you.
 

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Speed sense should be the Orange wire at the radio harness.
 

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Discussion Starter #5
tapped into the metra wiring harness orange cable instead of the stock radio wiring harness but speed sensor not detecting. ugh.
 

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That's because Orange on the metra side represents dimmer and illuminate. Shoulda specified before its the Orange on the factory harness side.
 

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Discussion Starter #7
thanks for the info. so i should tap the orange wire on the radio harness 4 speed sensor n brown wire for illuminate?
 

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No. Factory wiring colors change between vehicles, only aftermarket harnesses use the same colors. Wat you want to do is tap into the orange wire on the factory side (not on the metra harness) with the speed sense wire from the HU harness. If you want the screen to dim with the headlights, you'll want to connect the orange wire from the HU harness to the Orange wire on the metra harness, IF you're vehicle supports that feature at the radio. If it doesn't then tap the HU Orange to parking light positive.
 
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