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NEW! Technical Info: 4th Gen DRIVETRAIN Technical discussion of fourth generation (2007.5 and up) 6.7L engine and drivetrain questions, solutions and upgrades. For trucks with the 5.9L engine use the appropriate 3rd gen forums.
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Old 09-11-2020
smokediver's Avatar
smokediver smokediver is offline
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Join Date: May 2006
Location: Mississippi
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Default P063C code - alternator voltage sense low

My check gauges light came on Thursday on the 07. Everything looked fine. all normal.
When I shut the truck off the light stayed on.
No check engine light, only check gauges.
Checked codes, have a P063c - "generator voltage sense circuit low"
Gauge in the dash shows 14 volts, right on the money. Just changed the alternator 2-3 months ago.
Ran all day yesterday and I know from experience a 6.7 wil not run long if it isn't charging.
Haven't put a meter on the batteries yet to confirm the 14 volts, but like I said, running all day long.

Anybody solved this quandary or have any thoughts?

Thanks
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'07, megacab, 2WD, Dually, 6.7, auto,
H&S XRT, jasper turbo, ETE tranny, 485k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto.
H&S mini maxx, something fell off under the truck 265k mi
My Other Truck is a Fire Engine!!
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Old 4 Weeks Ago
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smokediver smokediver is offline
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Join Date: May 2006
Location: Mississippi
Posts: 4,075
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Update...

Seems the 2 wire plug on the back of the alternator was down to 1 wire.
I had noticed when I changed the alternator a month or so ago that there were 2 strands of copper keeping the red wire attached right at the plug. I reinforced it with electrical tape and ordered a pigtail off ebay.
Snipped the old one and spliced it in Sunday, "check gauges" light gone, all good.
__________________
'07, megacab, 2WD, Dually, 6.7, auto,
H&S XRT, jasper turbo, ETE tranny, 485k mi !!
'09, quad cab, Laramie, 2WD, Dually, 6.7, auto.
H&S mini maxx, something fell off under the truck 265k mi
My Other Truck is a Fire Engine!!
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  #3  
Old 4 Weeks Ago
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Clunk Clunk is offline
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Join Date: Mar 2004
Location: Tennessee
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Coool, we'll take that.
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