thats exactly right. im no expert but the idea is to run the power for the hids from the battery rather than the factory wiring to avoid voltage problems.
get a harness specific for the lights you are replacing.
if a WK 9006 low beams then get a relay harness from the HID vendor for that type of bulb. this way there is NO splicing.
and just to aggravate TYRANT some more
the GOOD vendors will recommend one relay harness for each side.............