Coming from the voltage regulator one wire has a yellow end and the other black

SOURCE: How to wire a tach on 05 heritage softail

Locate & route Black lead to ground / 2004-later softail: On the frame strap under the seat directly in front of the battery.

Locate & route the pink lead to Signal / For 2004 & later FXST/C/I The #3 cavity in the connector {39b} on the back of the speedometer. The socket terminal on the signal (pk) lead fits the #3 cavity.

Locate & route the Orange and white lead to power / Ummm.. it's saying for 2004 and later to adapt to the fuse block For earlier [ For 1996 to 2003 softail: locate the power lead (o/w) in the tail lamp pin connector {7a} under the seat behind the right rear corner of he battery.] "here you are looking to run it to a fused line, not directly to power/battery" I hope this helped.

SOURCE: which post is which on generator on a 1975 sportster?

the post should be the same as an original. The wires should be green and tan. Green wire goes to the post towards the front wheel and the tan to the post nearest the engine. Don't forget to "polarize" the generator before starting. procedure is in the service manual. Momentarily short between the battery positive post and the field terminal.

SOURCE: connecting wire from regulator

The large wire from the voltage regulator goes to the Positive side of the battery. As an alternative, you can also connect it to the starter where the large cable comes from the battery positive terminal to the starter. I think that's where most Softail models have the regulator wire connected.

If you connect it to the starter, all this does it make it a bit easier to connect since the battery is inside the horseshoe type oil tank. Basically, you are using the battery cable as an extension cord to the battery to keep from having to fish the wire up to the battery.

SOURCE: are the two wires coming out of our power

The voltage coming out of your alternator is AC voltage and has no polarity like Direct Current does. Therefore no positive and negative. Two of the wires should be formed into a plug or they'll be smaller and shorter than the other wire. These connect to the connection at the engine case. The larger gauge longer wire goes directly to the battery positive terminal.

SOURCE: where does the lead wire for the voltage regulator

There should be a total of three wires. There are a pair of smaller wires that connect to the alternator and a longer, heavier gauge wire that goes directly to the positive post of the battery. I've seen some people take this heavier lead and attach it directly to the starter as well, It's the same a connecting it to the battery positive post when you do it that way.

Good Luck
Steve