Have Ford Questions? Ask a Mechanic for Answers ASAP
How exactly are you testing for voltage at that inertia switch? With it unplugged I assume the positive voltmeter lead is on the wire coming from the fuel pump relay but where are you attaching the voltmeter negative test lead? It has to go to a clean metal ground and not just to the other wire leading back to the fuel pump in the inertia switch plug.
Ok at first you said, 9 volts, then you say 12 volts. I think it's best to tell me what color wires you are testing. I am going to get the wiring diagram, too so I know which you are testing and where.
Here is the wiring diagram,
There should be 0 volts at the pink/black wire with the inertia switch unplugged. If you read anything there, with it unplugged then there is a short circuit.
You did say, " I have 9 volts from inertia switch with the plug out "
Run a jumper from the inertia switch pin 2 to the fuel pump module pin 5 and bypass that pink/black wire and try that for now.
You said, "I also hooked up a 12 volt battery to pink and black and black at the fuel pump driver." but you never said what the result was, whether it ran or not.
I don't understand what you just said, "Yes between pink and black and black." Yes to what question and are they 3 wires? You said, "pink and black and black". What does that mean?
Ok, where did you ground this 12 volt source at?
I see that just because there is 12 volts to that module pink/black wire doesn't mean the fuel pump is going to run, that module also has to be triggered by the pcm as well. You may want to retrieve the codes from the pcm and find out if any refer to that module and/or wiring.
Once you get the code, give it to me.
I can tell you how to make s san tool for about $32. If you have a laptop even cheaper.
Here is how to make an inexpensive scan tool from a cellphone.
I bought his phone Alcatel Onetouch Pixi Pulsar A460G from the dollar general store for $20. It has the android system. You don't have to activate the phone or buy minutes, if you have a wireless router for your internet service. If you don't have internet service you can though purchase a USB adapter. The 2 adapters are either the USB which is a physical connection between the vehicle DLC and the phone or even a laptop. The other is WIFI, plus I believe it would work with Bluetooth also. Anyhow, I bought that phone for $20. Then purchase an ELM 327 adapter from here http://www.obdinnovations.com/elm327-wifi-obd2-diagnostics-scanner-for-apple-ios-android-pc/ for the wifi one or here http://www.obdinnovations.com/elm327-usb-cable-obd2-diagnostics-scanner-with-cp2102-chip/ for the usb one.
Then download the free software here, http://forscan.org/download.html
For the usb hookup you want the FORScan version 2.2.10 beta for Windows - free
If you want to go wifi, you will need internet access because you have to install it right from the cellphone from the google store but it's only like $5 for the FORScan Lite 1.1.3 for Android (Core 2.2.8) - paid
Charge it at 10 amps for an hour or overnite at 4 amps.