i think you can test it in the car. positive lead on the wire and ground to the chasis. i've recently learned
that you set the multimeter to 2k on the ohm meter and look for a reading less than 2, like 1.9 or so. - alhtough i think the #'s are different if its warm.
to get it out, i remember reading somewhere that you have to modify a socket to accomodate the wire....