This photo shows the road...
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This photo shows the road from Goodsprings (on the right side) in its entirety. The first junction, visible in the center of this pic, is here, and then you pass a road that goes north as you head up to the gate area, which is where you need to park.
Hopefully, this pic along with the topozone links provided, will make this TH easy to find for anyone seeking to do this southern service road approach.