Fried PCM or I have no idea - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 12-06-2009, 04:37 PM Thread Starter
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Fried PCM or I have no idea

So i have been trying to get my truck to fire up the past 2 days and have had no luck. I thought i figured out the start problem of being 2 relays under the dash. i would tap the relays and the truck would start. Got the truck to fire up and run normally 2 times so i figured the relays were the problems. I changed out the relays and went to turn the truck on, but as soon as i tried turning the truck over the entire truck went dead. No lights, no horn, radio, anything and everything has no power now. I can see a very dim light in the overdrive on off light and i can hear electrical clicking and beeping under the dash by the fuse box.

I don't understand how the replacement relays could have possibly fried the PCM. Also i checked all the fuses and nothing is blown. All i noticed was the beeping and clicking continues until i pull out the top left corner relay in the fuse panel.

I swear the truck and electronics are possessed. Any help or suggestions on what is going on? PLEASE

Luke

99 F-350 7.3 turbo diesel ext cab 4x4
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post #2 of 6 Old 12-06-2009, 06:38 PM
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You have either a fried positive cable at the starter, or some REALLY bad grounds.

This is what it sounds like to me. chase down all your grounds, starting from the battery posts, and clean everything up. you might be surprised at the result.
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post #3 of 6 Old 12-06-2009, 06:42 PM Thread Starter
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Ill take a whirl at it tomorrow in the light. just don't get why that would happen after changing the relays. Cuz i got the truck start twice and decided the relays were bad. changed the relays and boom

Luke

99 F-350 7.3 turbo diesel ext cab 4x4
All terrain tires
Hypertech Power Programmer III
Hurculiner on entire bed
Tonneau cover
fog lights
4" Straight turbo back exhaust
DIY Tymar Intake
wastegate delete
ISSPRO triple pod guages
Much more wanted but $ plays a big factor in college
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post #4 of 6 Old 12-06-2009, 06:48 PM
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I just noticed in another post that you just replaced your starter.

Check the connection from the battery positive cable on the starter.

When in doubt, retrace your steps carefully through ANY repairs leading up to the problem you are currently having.
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post #5 of 6 Old 12-07-2009, 01:02 PM Thread Starter
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thanks for all the help guys. Turned out my battery connections cooked up. I noticed them when i was looking at the computer connections. The lead actually got hot enough and melted. changed out the relays and put on new connectors and she is starting up beautifully

Luke

99 F-350 7.3 turbo diesel ext cab 4x4
All terrain tires
Hypertech Power Programmer III
Hurculiner on entire bed
Tonneau cover
fog lights
4" Straight turbo back exhaust
DIY Tymar Intake
wastegate delete
ISSPRO triple pod guages
Much more wanted but $ plays a big factor in college
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post #6 of 6 Old 02-16-2010, 10:48 AM
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Electrical fire - smoke while backing

I have 2006 f250 w/83000 miles has cost a fortune in the 1000 miles I owned it. Replaced fcim & #1&2 fuel injector at local dealership the 1st Wk. Today after backing in the driveway the truck started smoking under right side & heater blew smoke in cab. We do not see any electrical lines burnt. When we turn on key we have power & you can hear fuel pump but does not try to crank. Radio works & can't find any blown fuses. Help do not want to drop $2500 at ford dealership. Oh yeh we did add 4in flowmaster exhaust 4 days ago but I don't think that would cause this.
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