250-500cc Electrical question

I am rewiring the rats nest beind my head light, I currently have grip heaters, trailteck light connected to the yellow power wire using a couple of these quick splices.

http://www.delcity.net/store/Quick-Splice-Connector-!-18!14-Gauge/p_9373

Can I just do away with these And solder the red power wires for grip heaters and light all on one bundle on yellow wire instead? I am electrical newb so forgive me if dumb question

Yes you can. On the other hand I'm more for a safer solution and wire a fuse or 2 in there since you run a pair of gadgets that eat power. Like 2 of these on the wire fuse holders will do.
At least it is protected and if needed you can isolate something if needed, just take the fuse out.

Shouldnt you use a switch for the grips and another switch for the headlight?

do not use those, they are corrosion city. they like to partially cut the copper in your wire as well. very bad news, and quite the lazy solution. best way would be stripping and soldering with heat shrink but thats alot of work. i would use the butt splice crimp connectors that have the heat shrink tubing built in. that way you can just strip, crimp, and heat.

these are what im referring to..

only problem is theres one yellow power wire and several power wires for the other stuff to connect to the one power wire. Is there a connector that goes from one power wire that accepts several more like these or?

for the above splices, ive seen these bigger on one end to accept two wires, and smaller for one wire on the other.
below, there is also a cheaper way to do it where you can buy bare crimp connectors and heat shrink over them...i have never seen these 2 into 1 tho. you buy a bigger size and jam in what you needed and fill with solder tho.

theres these too, they take up a bit of room but should be able to find a home for them in your app. maybe install a fuse holder right off each one?

whats nice about all these heat shrink connectors is that when heated correctly (not melted) some glue will melted out of the end and thats when you know its water tight..