Question about Ford F-350

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On a 2005 Ford F350 6.0 Diesel (yup it's a a lemon) The truck has cost $16K since out of warranty. I'm on my 7th alternator and 3rd set of batteries. If the truck sits for a day it won't start and everything tests fine! Good news is Ford's fixed it a few times already (they're sneaking up on it) but as the service manager put it "These diesel problems are tricky, you have to fix a few things before you find out what's wrong"! I not Willy off the pickle boat and I can't afford to pay them to 'fix' it any longer if it takes 'every penny I've got'! This is the most recent of a long list of issues with this truck! Any thoughts?

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Well, the Diesel does not use Electronics to fire the cylinders. So you have a Timer system for the glowplugs and that is all. If you rig up a cheater light on one of the glowplugs and fuse it and run it to an added light inside the cab, you will know if the glowplug circuit is staying on or not. It should only activate a few flashes on each cold or lukewarm start and then stay off.

Alternator brush plug-in. The plastic clip containing the contacts for the tab in the Alternator can ride up when a Mechanic tries to install this wiring lead.

Rear window defroster staying on. Sneaky. Can be on without indicator light showing. Can break contact as Negative ground is disconnected.

Transmission solenoids and converter use electric. Possible short.

Battery Saver- Can deactivate charging system even at 70mph.
Anti-theft- Can reduce battery voltage to starter.

Would be interested in knowing final fix.

Posted on Oct 19, 2013

  • Cntrctr Oct 21, 2013

    Thanks for the feedback! You've given me a few things to look into!



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Posted on Jan 02, 2017

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SOURCE: 2004 Ford f350 Diesel battery problem

check the fuse for the alt. power supply box under the hood should be a big fuse

Posted on Dec 04, 2008

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SOURCE: ford f250 superduty turbo diesel 7.3L Will not crank

Charge the batteries. take a Reading to make sure that you are getting almost 14v to both batteries. If it is not charging then take the alternator back off and have them check it. you might have bought a bad one. There is a way to test the glow plus with out taking them out. ( Take a piece of wire long enough to reach all the glow plugs from the battery. unplug the glow plug wire.If you touch the end of the glow plug with the hot wire it should make a little spark. if no spark then the glow plug is bad. do this to each one, but one at a time)

Posted on Mar 02, 2009

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SOURCE: 97 Chevy Blazer - good battery, good alternator...still dies???

check battery voltage when you turn off car. it should be 12.5 volts.if drops 11.0 volts the battery is got a weak cell in it.i bought a sears die hard battery it last 2 years the battery had a defect .it had a bad cell it short out the battery.check alternator wires for defects.

Posted on May 29, 2009

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SOURCE: 2005 ford f350 diesel charging system

take the termanals off and look inside them. Use coke to clean them.

Posted on Jul 21, 2009

  • 1 Answer

SOURCE: 2005 Jeep Grand Cherokee battery will drain

Ditto here on a 2005 jeep. We bought it new and found the battery dead on a few mornings the first year. Nothing left on. Did the new alternator thing about 2 yrs. ago and a few batteries along the way. This is what we noticed..... If you leave a CD in the CD player, that is the prime little devil that sucks out the juice. Now, we never turn off the car while a CD is in the dash. Now, maybe not necessary every time, but always overnight and now by habit, all the time, we make sure there is no CD inserted when the car is off. Hope this helps.

Posted on Dec 03, 2009

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tnx 4 using fixya,


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