1971 Hemi Roadrunner battery harness question

[Rusty]

On the battery harness there is a tan wire as seen in the photo that stops a few inches from the bulkhead connectors. The other end stops at a un-insulated blade connector between the starter and the transmission (4 speed) reverse light switch. What is this tan wire for?
Thanks

 

[mopar 3 B]

If this were a 72 I would say hood directional indicator light and there would be a similar connection by the wiper motor but I do not remember seeing them on the hood in 71.

 

[Rusty]

71 they are fender mounted but that doesn't explain the other side of the wire?

 

[Rusty]

I'm beginning to think its something specific for the automatic transmission that isn't on a 4 speed

 

[Rusty]

I figured it out, it's the tach wire that goes in connector spot #20 and the other side goes into the engine harness to the coil