Starter or ignition switch? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 05-30-2013, 09:40 PM Thread Starter
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Starter or ignition switch?

99 f250 hd, six speed standard, 178000miles, starts when the clutch is depressed with key in the on position. It doesn't happen every time but when it does, the starter tries to engage when I shift gears while driving. Any ideas where to start troubleshooting?
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post #2 of 11 Old 05-31-2013, 12:53 AM
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Sounds like you have a short somewhere for sure. Pull the starter fuse, see if it still does it. That will tell you if the short is on the inside of the cab, or the outside. I'm guessing it will be in your switch, but guesses don't fix problems. If pulling the fuse does it, pull the ignition switch and see if you can find any obvious brokeness.

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PHP Phoenix, John Woods VB, NUC bypass, 6637

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legislative power, as the consequences will be the same to the people."

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post #3 of 11 Old 05-31-2013, 07:43 AM Thread Starter
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Thanks, I did not think of the switch its self. I will start with the isolation procedure first
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post #4 of 11 Old 05-31-2013, 09:04 AM Thread Starter
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In the power distribution box, fuse 21 when removed (50amp) elimenants the problem. In my owners manual for this fuse there is (B1and B3), whats that? This is one of two 50a fuses that is labeld ignition switch???? with fuse 21 removed the truck will start normally...I am confused
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post #5 of 11 Old 05-31-2013, 08:25 PM Thread Starter
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Well shoot, I went back out and tried to reverify the fuse, and low and behold the problem is still there even with fuse 21 removed, so I am back at square one...any suggestions out there?
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post #6 of 11 Old 06-03-2013, 06:52 AM Thread Starter
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Help! I am down due to this problem. I am trying to remove the ignition switch to see if that is where the problem lies. Anyone know how to do this? Is there something elese I should try first?
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post #7 of 11 Old 06-03-2013, 03:05 PM
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99-03 OD wire fix

How to remove the ignition switch is in there. Also a good time to check the mentioned OD button wires as well.

I hope you get it sorted out soon.

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
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--Thomas Paine, Four Letters on Interesting Subjects, 1776
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post #8 of 11 Old 06-03-2013, 03:32 PM
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OH, and I looked in my owners manual. Fuse 113 is for the starter. That may not be the same for your 99, but it's showing a specific fuse for the starter.

2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637

"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."

--Thomas Paine, Four Letters on Interesting Subjects, 1776
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post #9 of 11 Old 06-05-2013, 10:37 AM Thread Starter
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Ok, here is where I am so far. I removed the switch, only to find our it don't have any contacts in it. The key switch activates a switch that is futher down the steering column. This switch is the electrical portion of the ignition system. It is held in place by two screws and will drop down to expose the manual switch lever that the key switch intergises when the key is turned on. With out a schematic there is no way to know which contact point is the starter control. Any sugestions other than buying a manual? I have another problem that has come up which leads me to think this switch may be causing the problem. When I turn the key on to start the engine the wipers come on intermittantly.??????
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post #10 of 11 Old 06-06-2013, 06:39 PM Thread Starter
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Whahoo, got her fixed. I went to Auto Zone and bought a new ignition switch, put it in and still had the problem. So I sat and pondered how in the world could this be happening, everytime I depress the clutch with the key on the starter is trying to engage.....well I said, self, the only other possibility is the clutch switch. I contorted myself such that I was able to get under the dash and low and behold the switch was installed in such a manner that the clutch rod was rubbing the harness everytime the clutch was engaged. The positive wire on the switch was almost wore into, and the ground wire was chaffed enough so that when the clutch was engaged the two would short thus activating the starter....cost me $26 for the switch, so now I have a spare......
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