'74 wiring problem - please help.

[Doomed]

  Ok so I am installing a new Bill Evans engine wiring harness, but still am having some trouble.
 
I have the brown wire going to my ww pump, the dbl, green, and blk going to the alternator, the violet to the temp guage, the dbl to the carb, grey to the oil gauge, I then spliced the red wire from my MSD 6AL box to the brown and dbl to omit the ballast, with the blk going to ground.
Then on the other side, I have the yellow going to the ignition post on the starter relay, and off the headlight harness I have the thick red attached to the blue with the fusible link also going to the starter relay. This I believe is correct.
My issue is the split that comes off the engine harness with the 2 yellow wires and another wire (I forget the colour) that meet up in the 3 inlet adaptor and the blk wire. Where does this go? I heard this is for a seatbelt relay of which I do not need, but one of the yellow wires is the main power, no? I cannot get the dash to power up or the engine to start.
Please some wisdom.
 
Also do you have a '74 'Cuda wiring diagram?

Kyle.
 

[Bullitt-]

diagrams

http://www.mymopar.com/72to76_wiring.htm

[dodj]

The yellow wire is the starter solenoid power in my '73, but I'm not sure what you mean by '3 inlet adapter'? Something to do with the seatbelt relay I would guess.

[Doomed]

This is the 3 pin adaptor, sorry for the bad pic.

Kyle.

[dodj]

 but one of the yellow wires is the main power, no? I cannot get the dash to power up or the engine to start.

The wire that powers up your dash when the car isn't running is red. It's connected to the battery through a fusible link at the starter solenoid. It gets into the interior at terminal 16 on the BH connector. It's possible you aren't getting your dash to power up because the negative body ground isn't connected yet? There should be one relatively small wire from the negative post to the rad support and one large wire from the right side cylinder head to the firewall. Or maybe a bad fusible link?
From the looks of the wiring diagram supplied by bullitt, the seatbelt relay is in the interior so probably not those yellow wires purpose.
But first just see if you can get power to the dash.