I just bought the demon heat grips and it says to tap into an accessory wire I do not know what the color code is or where to find the end of an accessory wire hopefully some of you can give me some assistance

2003 fxdl

 

Your Dyna model has a hot wired so called B+ plug under the seat. More info on this subject to be found over here:

Electrical Connection Question

I wouldn't connect the 12v power feed to the B+ though:
1. IT IS HOT ALL THE TIME
2. IT IS NOT FUSED

Edit:

See post # 3

 

Did some Google searching and I think I found the wiring diagram for your heated grips:



Looking at this diagram, I noticed there's no option to control the power for the grips like H_D heated grips have (see image below).




In order to be able to have the grips circuit controlled by the ignition switch I'd recommend to add a fuse holder in the red wire and follow the instructions at page 7 under ORANGE/WHITE LEAD CONNECTION TO SWITCHED POWER SOURCE for the 2003-Earlier Dyna Models.

 

Yep I spliced my heat demons red wire to the orange/white wire on the left side control harness

 

To install the heat demon heated grips i just purchased It says to tap into the orange/white wires to get power for them as they are the accessories wire. Do u know if that color coded wire is switched so that they dont continue to drain. My battery after i turn the bike off?

And where is the best place to cut and make that 2 way splice?

2003 fxdl

 

Heat demon has a install video that show what to do in steps.

 

Yes it's switched. I ran my heat demon wires down the loom with the rest of the wiring harness and spliced them a couple inches from the plug