electrical problems right off the bat

[don_chate]

Hey guys, I've been lurking around here while researching used PSDs and figuring out a few things before making a purchase. Love the forum.

Found a beautiful 2005 extended cab with the 6.0, with most of the bulletproofing already done. The previous owner had excellent records of all the work he did at a reputable local shop. Nevertheless, I was meticulous in testing ECT/EOT deltas, signs of degas puking, FICM voltages, blowback etc. I ran a scangauge while test driving it and everything looked great and seemed to be as described by the seller. I drove it for about 15-20 minutes on the test drive and later decided to buy it.

So I am driving it home for the first time and all hell breaks loose.

Over a slight bump while getting onto the freeway I have the glow preheat/ABS/battery dash signals flash, radio turned on and clock reset and then tranny wouldn't shift - barely drivable. Pulled over and shut her down, after cleaning the remains of my lunch from the seat I started it back up no problem and drove for a bit everything seeming fine.

This happened one more time, about 20 minutes later in the trip - however after the flash the engine turned off going around 30mph. Pulled over waited a few minutes and started back up and drove the rest of the way.

Suffice it to say, not exactly excited about my new truck right now. I've been reading some threads on similar issues but just hoping to get some advice where to start investigating. Going to hook it up to my laptop soon to pull codes.

[don_chate]

No codes, did more reading, going to start looking around the FICM/PCM harnesses and under the intake for sloppy removal of chips (yea there was some Edge stuff installed in the past), loose connections, damaged wiring and what not. Seeing as it starts up fine and haven't had it die without actually being on the move, I still think its something shorting.

Also probably need this thread moved to 6.0 problems...

[Face Down]

Dude...that sucks! Hope you find the problem quickly and it is a easy fix!

[JayAF98]

Check the connections on both batteries and make sure all your fuses/relays are seated properly. If it happens only when you hit a bump. it sounds like it is simply a loose connection somewhere.

[dee004]

Originally Posted by don_chate

No codes, did more reading, going to start looking around the FICM/PCM harnesses and under the intake for sloppy removal of chips (yea there was some Edge stuff installed in the past), loose connections, damaged wiring and what not. Seeing as it starts up fine and haven't had it die without actually being on the move, I still think its something shorting.

Also probably need this thread moved to 6.0 problems...

Check all the connections are sound and all the harnesses for signs of friction damage from rubbing through somewhere. Also look at all the ground straps and check for signs of wear and tear.

[don_chate]

After my first round of checking I found a few things:

- 1 of the batteries doesn't hold charge. 12.1v after sitting for a day, the other one is not as bad (12.3v) but also probably on its way out. they're motorcraft 750s, cant find the year of manufacture on them

- truck has afe stage 2 intake, red wire that goes through the rubber grommet rubbed through insulation, grommet failed and it can intermittently touch the metal shield. This seems to be a common problem, saw other threads about it. Hopefully that's the primary electrical issue. Also took out PCM and cleaned all contacts before I noticed this.

- reduced coolant level in reservoir bottle - truck ran extremely clean no smoke or anything, hoping to god its just a small leak somewhere and not gaskets. truck had studs, gaskets, egr delete, HPOP done less than 20,000km ago. nothing on the ground but I haven't started it up yet since topping up and replacing coolant cap.

[dee004]

Keep us posted, Cheers