At 04:49 PM 8/8/2013, neil n wrote:
>... flat Romex type cable.

Romex wire uses solid conductors, which isn't good for applications
where the wire must flex or will be exposed to vibration, as in a
vehicle.  Stranded wire is the correct choice.

I prefer Tefzel wire, but it can be spendy:

http://www.bandc.biz/10awgwhitetefzelwire.aspx

But I often use the wire sold by West Marine for boat
projects.  Here's their sheathed two-conductor wire:

http://urlzr.mp/ncb