INERTIAL SHUTOFF SWITCH WIRING

[focodave]

Thanks fellows. Here is what I did this afternoon:

Got the connector and leads from the Pick and Pull in Millis:



Mounted it on the back wall next to the battery, and ran the leads in through the wall to catch the fuel pump feed under the rear carpet. On my car, the FP is fed through the interior, under the carpet about midway across the cab. This way, there are no penetrations to the outside. You need to pull the rear seats, and you need 2 grommets, as there is an ~2" air gap between the sheet metal in the trunk and the sheet metal in the back seat. i.e. 2 penetrations to get the wires inside the cab.





Took a test drive and all works well! I did accidentally drop the switch while working on installing it, and it tripped, so I know it works.

Nicely played, sir. Me likes!!

[RRoller123]

nibbes123: The Fuel Pump is located under the car, with a power and a ground feed to it. The power/ground feeds run along the inside of the cabin floor along the box rail and then branches out of the loom and runs over to near the center of the car where they pass out through the floor to the pump. I just cut the power feed inside the cabin as shown and put the inertial switch inline. I then did a long run around town (maybe 30 minutes) and then stopped and checked to see if the switch or wiring had any temperature rise. There was no noticeable rise, which leads me to conclude that inline is ok.

Pete

[majicwrench]

Ford uses the inertia switch to control the relay. The pump current does not flow thru inertia switch, so I would be nervous about using it the way you have it wired, as it is not designed to carry the amperage a pump will draw.

Keith

[RRoller123]

The Service Manager at Ford told me they wire it inline with the pump.

[majicwrench]

The service manager at Ford didn't look at a wiring diagram then.
I have a wiring diagram on desk in front of me. Inertia switch wiring into control side of relay. Pump power controlled via the relay.

I'm kinda anal about not guessing about stuff. Everyone is entitled to their own opinion of course, but not their own facts.

EDIT!! Looking thru various diagrams, I see them wired both ways!! Will check some more..

MORE EDIT> yours appears to be a very common mid/late 90's switch that ran the pump power thru the inertia switch!!

Course it figures that the first wiring diagram I pulled up showed it wire the other way.....jeesh,

[RRoller123]

Just to follow up, been running this for quite a while now (about 5 years), no problems. The wire gauge is obviously large enough for the draw from the fuel pump, the switch stays perfectly cool. No issues. Has NOT tripped accidentally so far, and no accidents, thank God. I did test the switch before I installed it by dropping it on the ground. It tripped. Push button reset.