Ksc-wa100 i need to know the wireing diagram for the power/ wire harness

Take a look at this manual diagram. https://www.manualslib.com/manual/359815/Kenwood-Ksc-Sw10.html?page=5#manual

Given the above is not your model, at least it shows the 10 pin. Ironically, below I offer a diagram of your model. The irony comes in the fact that the diagram appears labeled in Japanese But if you compare the two diagrams, maybe something will make sense from the one with the English labels. Otherwise, you might fire off a query to Kenwood customer support. https://www.manualscenter.com/manuals/kenwood/kscsw900-owner-manual.html
Here is a 10 pin harness compatible with the subwoofer. Kenwood Subwoofer Amp KSC Wa100 Wa80 Sw10 10 Pin Harness for sale online ' eBay

I don't have any information on how to power supply a kCSWA900 Kenwood subwoofer. However, I can tell you that the Kenwood KSC-SW10 compact powered subwoofer has a built-in amplifier with a 38 watts RMS power and a wired remote for control over volume level, variable low-pass crossover (50-120 Hz), and selectable phase control (0°, 180°) . The subwoofer comes with a power/ground wiring harness and preamp (RCA) and speaker-level inputs .

https://www.manualslib.com/manual/287091/Kenwood-Ksc-Wa100.html?page=5#manual

Hello mikealtre,

Hopefully there's enough of the wires left to see their colors.

Here's a link to the manual. Other than the speaker level inputs, there's only 3 wires you need to be concerned with. Yellow is main power, black is ground, and blue is remote.

Hope this helps.

Never Use That Thing Again

Subs are subs, they come with no wiring. You need an amp and all necessary wiring to get it bumping. What type of deck do you have? Where will the sub be placed? In the trunk? Amp install is easy. Also suggest purchasing one of those amp kits for $20-$30, makes it a bit easier.

Hello annieandstev,

The part number you want is E30-5462-38. It is available from: http://www.pacparts.com/. The cost is $43.66 plus shipping.

You may want to call their toll-free number and verify that the part is in stock: (800) 421-5080.

Hope this helps.

If it is one sub with one amp, one remote needs to be hooked up. Not familar with your exact set up, but should stay constant for all. The remote signals the amp to turn on power when the deck is turned on thats it.

i had the same problem Here is the diagram i used from someone else on fixya.  Thank you.

I had the same problem.Here is the picture i used. 

You should run a new power wire to the battery or fuse box from the Sub. For safety there should be a fuse on the cable at the battery or fusebox end.