DEAD dash after blue wire mod...PLEASE HELP - Ford Powerstroke Diesel Forum
6.0L Electronics Discussion TV's, Radios, everything electric and NON-Performance.

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post #1 of 5 Old 06-16-2019, 02:59 PM Thread Starter
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DEAD dash after blue wire mod...PLEASE HELP

I did the blue wire mod for my fan clutch. I used the upfitter pass through wires to gain access to the inside of the cab (the truck does not have upfitter switches). After doing this mod the dash shuts off, no windows, no radio. However, I also get a glow plug open circuit DTC error code on all 8 glow plugs. The blue wire mod has been disconnected with no change.

Here is what happens:

I start the truck everything operates ok. After about 20 - 30 seconds I hear a click from a relay in the inside fuse panel and the gauge cluster dies with no power to the windows and radio. The engine does not die. After cycling the key off and turning the truck back on it does the same thing.

If I just turn the key on and not start the engine the cluster does not turn off and every thing works fine, its only after starting the engine.

Even unplugging the fan clutch I still get the same results.

I also get the P0671 through P0678 errors codes. Even after clearing the codes they return once the keys is cycled and the truck is started again.

I am really stressed out because we are leaving tomorrow with the toyhauler for a camping trip. Any help would be greatly appreciated.
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post #2 of 5 Old 06-16-2019, 04:59 PM Thread Starter
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Found the problem....The DC Power Alt was over charging. After the dash would stop working I tested the output voltage and it was 16 - 17 volts.

I hope the blue wire mod didn't cause this to happen. At the same time the post on the alternator had been melted and charred for a while.
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Last edited by Calkidd; 06-16-2019 at 05:04 PM.
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post #3 of 5 Old 06-16-2019, 05:39 PM
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Yet another reason for having some sort of monitor...

Glad ya figured it out!

-jokester

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post #4 of 5 Old 06-16-2019, 05:44 PM
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Don't ground your blue wire mod to the dash, ground it to something solid in the engine bay. The wimpy metal in the dash can cause a ground loop.

Sparky
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Fox 2.0s, Toyo ATs, CTS2 Pro, Blue Spring, BPD 7.3 Fan Clutch, IPR Coolant Filter

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post #5 of 5 Old 06-19-2019, 07:50 AM Thread Starter
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I wanted to give an update to this post just in case there are others that have read this and might be scratching their heads. Even though I usually go back through and check what I did different I had forgotten one step that was causing this problem.

This is all because of the OEM charging cable that runs from the alternator to the passenger battery positive post. Even though I am using a 2/0 awg cable to run directly from the alternator to the passenger battery you MUST keep the OEM charging cable attached to the battery. This is what powers the GPCM and the 12v power to the alternator's 2 wire plug. By removing this cable it will give you the glow plug DTC codes P0671-P6078 and cause your alternator to overcharge. I am lucky I didn't damage any electronics even though I did get a FICM over voltage error code.

I had removed this smaller cable thinking I didn't need it anymore. So the blue wire mod did not cause this as it was totally operator error.
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