Electical Gremlin Exorcism NEEDED!

HotRodTractor

Ford Driver
Nov 29, 2009
56
0
0
Short version - I stripped my 2006 LBZ down to a bare frame - and proceeded to install a solid front axle, redo the rear suspension, relocate the batteries to the rear, do some minor bolt on upgrade improvements under the hood (I already had compounds, I updated them a bit....)

I'm just now getting it together to fire for the first time - I hook up the batteries and I immediately get a check engine light and the turn signal indicators on the dash light up solid. If the computer is unplugged - then I just get the turn signal indicators.

I have no lights inside the cab, no power to the radio, windows and locks don't work. I've pulled the fuse box back apart just as a double check - no corrosion and no real way that I see I could have mixed up the plugs. I haven't found any corrosion anywhere - I haven't been able to locate any rubbed of chaffed wires.

The only changes in the electrical system that are recent - is the relocation of the batteries - they are mounted in the back - 1/0 wire all the way to the front to a pair of terminals I mounted inside the frame - I cut the OEM battery cables for the passenger side and connected them to these terminals.

The truck has an after market remote start system on it - that was installed when I bought the truck new (or shortly after....) - I've looked quickly at it and can't see anything that would cause issues, but I am going to double check everything.

I've been going after this all afternoon and am getting frustrated with it.... I'd like to think that I have a pretty good understanding of this thing. Any ideas or known issues that resemble this would be awesome if someone could point me in that direction. I've been searching and not coming up with much.
 

HotRodTractor

Ford Driver
Nov 29, 2009
56
0
0
Did you check the main ground wires at the front cab mount, drivers side?

I'm going to go over all the connection points again in the morning with a clear head. That being said - I could see if I was getting intermittent power that it could be a ground - but to me it acts like I'm getting some sort of power feedback somehow. If I have everything connected with the keys out of the ignition and the ECM relay removed - the moment I insert the ECM relay it closes its contacts very decisively - so that relay is being triggered somehow.
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
13,712
773
113
Texas!!!
Did you check the main ground wires at the front cab mount, drivers side?
I believe there is also another ground that runs from the driver's side negative cable to the front drivers side core support body mount. Best I can recall, it also grounds a wiring harness that runs under the core support.
 

blk smoke lb7

<-----Lots of green $
Nov 8, 2010
5,694
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36
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belvidere,ill
I had a similar issue and 1 of the grounds was off on the passenger side,it happened again and the ring terminal had broken off. Good luck.
 

HotRodTractor

Ford Driver
Nov 29, 2009
56
0
0
It was totally a ground that got missed - well its still technically missing... lol I started testing with the meter and found that I had 8 volts on the cab relative to the frame at all times - I looked around and couldn't find any grounds that I had placed on the cab... so I added one - and it basically fixed everything. Sometimes it just takes a clearer head to approach a problem systematically and that wasn't me yesterday.

[YOUTUBE]http://www.youtube.com/watch?v=__3YznIAPvk[/YOUTUBE]