EFI intertia switch location?

reenmachine said:

Since it's sensing inertia, not direct impact, it should work exactly the same no matter where in the car it's mounted, as long as it's mounted to rigid structure. I don't think I've ever seen an OEM installation that wasn't under the dash somewhere.

Click to expand...

I'm not sure what cars you are looking at with OEM installations but every Ford I have ever found them in at the salvage yard they have always been installed in the trunk area somewhere. On Mustangs they are right on the back panel and in the onthers I have seen them on the trunk hinge support. I'm not saying some are not installed under the dash but I have never seen any there.....but then again I am usually looking at the same types of cars for the switches.

I think the term interia witch is a misnomer also because they do take a pretty good sharp jarring to trip. I'm assuming that they should work fine under the dash but since I have always seen them in the trunk that is where I installl them and every set of instructions I have ever seen say to install them there as well. In fact the instructions form the Motorsport EFI wiring harness directly from Ford states "The inertia switch should be mounted on a flat surface on the vehicle's rear bulkhead with the plunger pointing upwards."

I just dug those instructions up to to see what they said and they confirm what I already felt to begin with so I personally will stick with trunk installations myself.