If you use a digital multimeter across battery posts, everything off, the generic for a full charge is 12.6 volts, and yes the .6 is a big deal. Generally it says if voltage is 12.4 or below, you need to charge the battery. Just my opinion.
Leave the meter leads touching the battery posts, have helper turn key to crank position, Does the reading drop, what is the reading? If it does drop very much, then check for an open circuit to starter. If it drops all the way to zero, your going to have to check battery and battery connections.
I did look at your starter wiring diagram, it appears your security system is a starter motor disable. If the security system is the issue then you may need a scanner to communicate with your security system.
SOURCE: 1998 windstar van
All these systems are controlled by the GEM, that is the Generic Electronic Module, have Kragen run a quick test and see if the system has codes, but most likely the Module is defective, it is located on top of the fuse panel to the left of the steering column. I have 30 years as a Ford tech so I am pretty darn sure of this diagnose.
SOURCE: 1998 Ford Windstar van will not start.
Ford starters have a solenoid that is a relay to the starter. I could not read the rest of the problem? Got changed ignition, starter and....
SOURCE: Diagram of Location of a Starter Motor on Ford Transit 2002/2003
i have a 2001y reg transit tipper and i think the starter motor is going when i go to start it like grinds then some times it starts perfect
SOURCE: 2000 ford windstar won't crank over,but pats keys good, and batt.
First thing I would check is to see if you have power at the trigger wire of the starter motor while someone is trying to start the vehicle for you. It will be a Yellow with a light blue trace. If you do then I would check to see if the main battery cable has power to it all the time when someone is trying to crank it. If it does then I would hold a test light on the case of the starter motor and have someone try to crank it. Make sure that the ground you use for this test is on the negative battery terminal not just anywhere on the car. If the test light lights while you are cranking it then you have a bad ground. Hook up a set of jumper cables from the battery negative terminal and clamp it directly on to your starter motor and see if it starts. If you check it and the test light doesn't light up and all the other checks are good then your starter motor has failed. If one of the other tests has failed then you have a starter relay problem or something else. let me know what you find out.
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