How to reattach ABS wires into connector

Check out these threads:

(1) Front Abs connector broken | Ninja 400 Riders Forum
(1) ABS Main Harness (Front) broke - advice? | Page 2 | Ninja 400 Riders Forum

I was able to protect mine before it broke, but you can see other folks doing repairs after the fact (in the first thread the guy actually salvaged the existing connector pins).

If you are asking how do the wires break? Just by turning the handlebars back and forth enough times -- the wires have no stress release, so they bend right at the connector crimp, and eventually the metal fatigues and breaks.

I think the issue wasn't a lack of slack for movement, but where the movement actually occurred... The wires have a thick plastic sheath all the way up to the connector, so that portion of the wire tends not to bend in favor of the fragile place where the bare wires enter the connector doing more of the bending -- so a disproportionate amount of the bending occurs where the wires are most fragile... On my bike, I just covered that portion of the wire with heat shrink tubing, so it could not bend, and now the thick plastic sheath (which is unchanged in length from stock) bends instead, distributing the bend over a longer length of wire -- so hopefully I won't have a failure.