7.3 wont turn over - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 4 (permalink) Old 12-14-2011, 08:52 PM Thread Starter
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7.3 wont turn over

Hey i have a 2000 f-250 7.3. I parked the truck last night everything was working fine it has brand new batterys, but when i woke in the morning to start it nothing would happen it wouldn't even try to turn over. It kept blowing #20 fuse (starter motor relay coil, clutch switch). I figured there was a short in the starter so i replaced it and it didn't fix it. Next i checked the starter solenoid, while checking to make sure everything was tight i grounded it out and it tried to crank so i figured that was my problem. I put a new one on and that wasnt the problem either. I'm all out of ideas any help would be greatly appreciated thanks.

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post #2 of 4 (permalink) Old 12-14-2011, 11:32 PM
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What exactly grounded out? The case? The typical test is to use a voltmeter and see if you are getting 12v+ to the small lead on the fender mounted solenoid when you turn the key. If not, you have to find out why.

As a side test, run a jumper cable from the + side of the battery to that small post on the fender mounted solenoid. You should hear a click and the starter should engage. If it doesn't, you got a bad solenoid or starter.

Back to the 12+ on the small lead. Two main reasons you wouldn't get power would be neutral safety switch (part of the digital transmission range sender) and the ignition switch itself. You don't mention if its an auto or standard, so I'm assuming auto until you say different. Try starting in neutral or jiggle the gear selector around while you have the key in the start position. If that helps, replace the dtrs, if not - the switch.

In the meantime, to get it started, you should be able to put the key in the run position and then jump to the small post on the solenoid to crank it.

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post #3 of 4 (permalink) Old 12-15-2011, 12:24 AM
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actually, jiggle the gear selector in the p position while having the key in the crank position. There are two bolts that come loose from time to time down the steering column where the shift lever is attached to a lever (It's torx bolts, I think T25) You can find them when you lay on the floor, look from the pedals up towards the steering wheel and wiggle the gear selector level. Because they get loose, your gear selector is not on the switch that signals the PCM that you are in P position. So to prevent the starting of the engine while in gear, the PCM does not allow to crank. If this is it, it is an easy fix and costs nothing.

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post #4 of 4 (permalink) Old 12-15-2011, 11:35 PM Thread Starter
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thanks for all yalls input, today while looking at the neutral safety switch i noticed the drive shaft had ate up a bunch of wires that had fell down.
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