First Weak Crank No Start, Now No Crank - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 10-04-2016, 05:23 PM Thread Starter Rookie
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First Weak Crank No Start, Now No Crank

Hey guys,

I have my uncle's 2005 F250 6.0L PSD. About a week ago I got back from vacation and it had some trouble starting, the crank got pretty weak after 2-3 revs but then it would start up. Then a couple days later I got it started but it stalled out before I got out of the driveway. I don't know much about modern Fords, but I voltage tested the FICM and it came up lame when I tried to start it. With the key in the ON position, voltage was good (48V) but when a buddy tried to start the vehicle, the voltage started dropping. When I did this, however, the batteries were not fully charged, they read about 11.8V. I have since fully charged the batteries, but the vehicle still won't crank. Batteries do not drop below 10V when trying to start, so I think they are good. What I believe is the starter solenoid (mounted on the inner passenger side fender) clicks a lot just when the key is in the ON position, but I'm not sure that it's abnormal behavior, since I am not really familiar with this vehicle.

Since the FICM tested bad I have a mind to think it's the problem, but if the FICM is bad would that cause it not to crank? 127k miles. Thanks for any input.

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post #2 of 3 Old 10-04-2016, 05:34 PM
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A bad FICM wont affect cranking what so ever. And low battery voltage could be affecting FICM voltage. Could be weak batteries, wear solenoid, or weak starter. Have to fix the crank problem before you tackle the FICM IMO.

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post #3 of 3 Old 10-04-2016, 07:12 PM
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Remove the belt and try to crank. Also unplug the fan clutch and try to crank.
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