[anvle]

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

 

[dunston]

I used the same kit on my 04 Miata if that helps. :yes: But yes, it will work on your 2010 3.

 

[anvle]

yes it works thank you! just need to figure out which wire is for the speed sensor.

 

[xGuardianCorpsx]

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

 

[anvle]

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

 

[xGuardianCorpsx]

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

 

[anvle]

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

 

[xGuardianCorpsx]

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.

 

[anvle]

orange wire works perfectly for VSS. THANK YOU!