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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1583028" data-attributes="member: 29141">The inertia switch is simple. The two wires on that plug are +12v input from CCRM and a +12v output directly to the pump, just a simple passthrough. So you can just key-on probe either wire with a simple voltage probe light stick thingy or a multimeter. If no voltage present, then it's either CCRM fuel pump relay is gone or there is an open break on that 12v wire from CCRM to inertia switch. If +12v is showing up at that inertia switch junction, then likely it's the fuel pump that died or there is an open break on the +12v output line from inertia switch to the pump or the inertia switch itself is at fault (which is unlikely) but that can be tested for with a multimeter. You'd just unplug it like the previous test, set a multimeter to either an ohm (resistance) test or better yet the diode check function with audible tone indicator and just simply touch both leads to both inertia switch terminals simultaneously (being careful not to touch the MM leads to one another) and if it beeps then it's a good switch. If no beepy, the switch is gone.</blockquote>