99-02 Radio VSS Wire

[MadManAndrew]

Hey guys,

I'm installing an aftermarket nav unit in my truck and it asks to be connected to the VSS. Is there not a VSS Wire in the factory radio harness? I thought there was for the radio's volume adjustment. There's a set of wires in one section of the factory harness that the Metra harness doesn't connect to. I'm assuming it's one of those but I can't find any info on it.

Any help would be appreciated.

Thanks,
Andrew.
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