Is this a 7.4L engine? If so there should be power there when the key is on engine off. The other wire is a ground that goes to the pcm to pulse the injector. If you are having trouble with missfires on No. 7 of a 7.4L you may have a preasure regulator vaccum diaphram leak. This vaccum connection is on the No. 7 intake rail. To check pull the hose off and check for fuel in the vaccum line if there is the diaphram is bad and you can pick this up at you local parts store. If there is no fuel you can check to see if the regulator holds vaccum with a hand held vac. pump.
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It depends on the symptoms. I would check (or have checked) the battery compartment, power connections and the electric motors.
And why are you posting the question and not your friend whom broke it?
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Best Manuals these online books have details and instructions on everything, parts, procedures etc. in a car. I have attached link so you can you yourself one of these. It's very helpful. All the best
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