Author Topic: What are these wires?  (Read 3669 times)

Offline 82apache

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Re: What are these wires?
« Reply #15 on: January 06, 2020, 12:36:20 AM »
OK lets try this


Offline bd

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Re: What are these wires?
« Reply #16 on: January 06, 2020, 01:08:59 AM »
Those siamesed wires appear more like light blue and light green in that image.  They are in the torque converter clutch circuit of an MV4 (TH350C) or MD8 (700R4) transmission.  Is there a free-hanging orange connector with one light green wire in the vicinity of the fuse box?
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline 82apache

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Re: What are these wires?
« Reply #17 on: January 07, 2020, 03:49:12 PM »
Those siamesed wires appear more like light blue and light green in that image.  They are in the torque converter clutch circuit of an MV4 (TH350C) or MD8 (700R4) transmission.  Is there a free-hanging orange connector with one light green wire in the vicinity of the fuse box?

I am not seeing one.
Still a swamp under the truck but I twisted myself into a pretzel and tried to trace them under the dash. Where they are not faded they seem to be green and light green.  The come through the firewall up behind right side the gauge cluster then seem to head off toward the passenger side I lost them at that point. Could they be for the tank switch?

Offline bd

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Re: What are these wires?
« Reply #18 on: January 08, 2020, 07:50:36 PM »
Yep!  Dark green/light green pair; looks like it connects the dash switch to the fuel tank selector valve mounted under the cab.
« Last Edit: January 08, 2020, 07:59:44 PM by bd »
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline VileZambonie

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Re: What are these wires?
« Reply #19 on: January 09, 2020, 03:34:40 PM »
Next time post a pic to begin with. Could have saved a lot of time playing guessing games.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 82apache

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Re: What are these wires?
« Reply #20 on: January 11, 2020, 12:48:46 AM »
Yep!  Dark green/light green pair; looks like it connects the dash switch to the fuel tank selector valve mounted under the cab.

Thanks!  Any idea what the original routing was?