Riddle me this- truck wont crank at night with a jump pack and other truck but works - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 02-17-2013, 07:27 AM Thread Starter
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Question Riddle me this- truck wont crank at night with a jump pack and other truck but works

Ok so I had to get a new pcm from ford this past week and picked the truck up on friday afternoon. It started just fine at 3:00 in the afternoon in high-40 degree weather on friday. I went to start it up yesterday morning at 8:30 in mid-30 degree weather and no crank, put the jump pack on it and a minute later my truck turned right over. After parking it last night around 6:00 and letting it sit until 10:30 when I tried to respond to a fire call. NO CRANK AGAIN, same routine, put the jump pack on and no luck after a minute. About and hour later I was able to go get our f-350 v10 brush truck which I've used in the past to jump my truck for unrelated issues. still nothing. this morning I put the jump pack on again and it cranked with in 30 seconds. I didnt even try to start it without the jump pack this morning. Any ideas? I'm sure Im probably missing details that would be beneficial to diagnosis so ask and ill try and fill you in. Thanks for the input guys!
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post #2 of 10 Old 02-17-2013, 07:30 AM
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Riddle me this- truck wont crank at night with a jump pack and other truck but works

Sounds like battery or starter issue. Check your terminals for corrosion. Also get the batteries checked to be sure they are still good.


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post #3 of 10 Old 02-17-2013, 07:33 AM
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I don't know about this but I can tell you that in my 2002 camaro I was having the same issues I would have to turn the key a bunch of times or hold the key in the start position and eventually it would start I had a buddy that worked at a chevy dealer and he installed a new BCM and a PCM and also did something with the security system cause of the chip in the key and it worked so I would try holding the key in the start position for up to 3 min if the truck starts it has to do with one of the CM's they put in computer controlled vehicles these days
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post #4 of 10 Old 02-17-2013, 07:52 AM Thread Starter
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I'm gonna clean the terminals and check the batteries. I had to turn my truck over to ford because I fried my original PCM and the second one I ordered offline "pre-programmed" except for the glow plug signal. If i plugged the truck in it would crank and turn over. FOrd deemed that PCM defective and i had them put one in because i was too fed up to go out and hunt another one down. Now it wont crank when cold. so im thinking in their tinkering u der the hood they did something that is now causing a constant draw.
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post #5 of 10 Old 02-17-2013, 08:37 AM
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try jumping the starter solenoid wire to the starter motor cable when the problem would normally occur. if it cranks consistently doing this, the problem lies before the starter in the circuit. you can further pinpoint from there. if it still doesn't crank, the problem is either the starter, starter connection(s), B+ cable/connection, or a poor ground. you basically separate the power side and the control side by doing this
it doesn't sound like a draw.

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post #6 of 10 Old 02-17-2013, 09:05 AM
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Maybe your batteries are bad and just can't crank it as fast as it should.

You haven't posted the yr of your truck The earlier ones were much more susceptible to the PCM stopping the injectors from firing as the cranking voltage dropped.

Is THIS what's happening to you? ->
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post #7 of 10 Old 02-17-2013, 01:58 PM Thread Starter
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2002 f-250, the truck wont crank at all. Just the click of the relay.
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post #8 of 10 Old 02-17-2013, 03:05 PM Thread Starter
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OK so the truck wont crank again and its dark. I had it running at 5:15. The Ford dealer will be getting a very warm and fuzzy phone call tomorrow morning. I cant see how the temperature drop would kill the batteries like that. Also the batteries are motorcraft and are about a year old at best.
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post #9 of 10 Old 02-17-2013, 04:14 PM
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Test your batteries quickly before you try and start the truck. Quick check with a voltmeter. Also check your starter cable.

It could be your starter solenoid. I had a similar issue with my old ranger. Colder temps but same idea. When it got to -15C or so. It would just click, not even with a boost. Then after much beating on it and trying I jumped it with a butter knife and it fired right up. I changed out the relay and problem solved. When I took it apart it was all burnt up inside

That would be my next step if I was you.

Or the "proper way". Test voltage at batteries and the crossover cable, then check it at your solenoid accross the terminals when trying to start the truck, then check the starter cable. Follow the flow of power and make sure it's not just something simple, and not cranking at all probably isn't anything too major.
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post #10 of 10 Old 02-17-2013, 05:57 PM
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When it won't start did you try holding the key in the start position and see if it would crank within 3 minutes cuz I'm still thinking its a CM issue
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