2003 Ford F550 XL 4x4 drw superduty 7.3l turbo diesel

Truck wouldn't start. replaced starter (new). truck wouldn't start.

With truck in RUN position, we crossed the 2 big terminals on the starter and it fired up.

So ...



The yellow wire 'C' had continuity through to 'B' on the starter motor solenoid.

'A' had 12V with the ignition in the RUN position so we figured that the yellow wire 'C' was broke enough to not pass full current. We ran that blue wire down to 'B' on the starter motor, figuring it would be our new exciter.

Now the truck starts when you put the ignition in the RUN position.

What would you test to isolate the problem here ?

Thanks,
Pete

 

Did you check the solenoid under the hood on the fender?

 

Rick,

Thanks for the reply. I thought that is where I would find the starter solenoid as well, on the inside of the passenger fender.

Is this not the starter solenoid?



If you read my original post, you will see where we found continuity from post 'C' on the solenoid shown, to post 'B' on the starter.

I'll have a better look on the fender, if that's where you are saying it is on the F550 7.3L diesel v8.

Any other ideas ?
Thanks,
Pete

 

Is the blue wire connected where the yellow wire was, or is it on a different post?

did you do any voltage checking before adding new wires? Is the yellow wire getting 12v when the key hits START? Is the relay bad?

 

Pete,

I was just guessing that the solenoid would be on the fender, but what I should have said was to replace the soleniod to see if that cures the prob. I was looking at the pic. of the starter and thought that was what you were referring to as the soleniod.
My mistake, I would still replace the solenoid though.

 

I'm not certain, because I'm not very familiar with that year 7.3, but that looks like the glow plug relay, not a starter solenoid. It looks like the glow plug relay on Dad's '96 anyway, although it's not in the same place.

 

Just saw your pm.. Did you fix it yet?

 

The solenoid you wired to is for the glow plugs, they come on when the truck is turned to the RUN position.