Label all you wires - both ends. Helps identify them when you trouble shoot.
Like the idea of solder connections. crimps corrode. I also like to use heat shrink with silicon inside. Totally sealed.
Be sure wire from battery/relay is heavy enough for total load.
Get rid of in-line fuses... = another failure point and another point to have to find and trouble shoot.
Be careful of wire runs, that they do not get squeezed or crimped by body work or other bolts and etc. I like to run one run forward, all in cased in Expandable Braided Cable Sleeving [http://www.cabletiesandmore.com/ExpandableSleeving.php]
. This keeps it all neat, looks "factory", and protects it.
On my GSA, I have this sleeve running forward to a small fuse block up front. This way, I only have one main wire running forward. However, the GSA does not have many places to hide wiring. The front fuse block is also accessible.
I have attached the LT photo and diagram.
As you can see, I run - > Dual HID, > Horn, >Radar Detector, > GPS, > Motolights (50w each), > PIAA running lights, > Heated Jacket front and rear, > and Ipod.