An embodiment provides a wiring harness that connects a telematics device
to a host vehicle. One embodiment of the wiring harness may include: 1) a
cable featuring a plurality of wires; 2) a first connector featuring a
snap-on adaptor that attaches to a connector core with a pin
configuration that mates with a diagnostic scan tool; 3) a second
connector that connects to an in-vehicle diagnostic system; and 4) a
third connector that connects to the telematics device. A wiring kit
embodiment and method embodiments for coupling a telematics device to a
host vehicle are also disclosed.