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Author Topic: Mystery Wire?  (Read 6570 times)

Offline 76_Scottsdale

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Mystery Wire?
« on: October 26, 2007, 01:33:43 PM »
When I had my tranny out and I was cleaning up the back of the block, I noticed a single blueish/greenish wire with a single rubber covered female spade connector that comes out of the harness going behind the block. It is part of the stock harness so I thought it must be the oil pressure wire, but when I searched the forum here I found pics of a sending unit right next to the distributor and I don't have one like that. The wire looks like it is just the right length to connect somewhere on the block close to the distributor. I've never had problems with my oil pressure gauge before, so if this is the wire I must've accidently unhooked it. Does anyone know where this wire goes? My truck is a 76 K20 with a 350 and it has an oil pressure gauge, not a light. Thanks again.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline VileZambonie

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Re: Mystery Wire?
« Reply #1 on: October 26, 2007, 02:01:48 PM »
Sounds like the heater blower connector. Got a pic?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #2 on: October 26, 2007, 05:09:09 PM »
Yeah it's a little dark in my shop but I'll try to snap a pic.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #3 on: October 26, 2007, 09:47:27 PM »
Well no pic but it's not the blower wire.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline VileZambonie

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Re: Mystery Wire?
« Reply #4 on: October 27, 2007, 07:26:48 AM »
What trans do you have? If you have a TH400 a similar connector goes to the detent solenoid. Was the truck ever equipped with a TH400?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #5 on: October 27, 2007, 05:17:49 PM »
No it was a SM465 but now it's a 700R4
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline VileZambonie

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Re: Mystery Wire?
« Reply #6 on: October 27, 2007, 09:28:02 PM »
Are you positive the truck never had a TH400? Otherwise post a pic. My oldest manual at this point is 1980 although most of the wires 73-80 were the same color code for the most part.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline txtj79

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Re: Mystery Wire?
« Reply #7 on: October 28, 2007, 03:58:45 PM »
Is it the underhood lamp?
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Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #8 on: October 28, 2007, 09:27:36 PM »
Yes I'm positive it never had a TH400. I have the factory price sheet listing a factory 4 speed. It doesn't have anything fancy like an underhood lamp. I don't see a sending unit so does this truck have a manual oil pressure gauge? If so I can rule that out because other than oil pressure I have no idea what it could be.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline VileZambonie

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Re: Mystery Wire?
« Reply #9 on: October 29, 2007, 04:42:56 AM »
It's not for your back up lamps?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #10 on: October 29, 2007, 12:12:21 PM »
No I found those wires, they are bright green and dark green together in one plug that came off the tranny. This wire has really got me stumped. As far as I can tell it's not for any gauges but it looks stock. The wiring under my hood is all nice and neat from the PO so I can't imagine there was a wire hanging back there for no reason.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #11 on: October 30, 2007, 09:08:10 PM »
Anyone have any ideas what this wire is?
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust

Offline VileZambonie

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Re: Mystery Wire?
« Reply #12 on: October 30, 2007, 09:16:25 PM »
Post a pic
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              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline DnStClr

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Re: Mystery Wire?
« Reply #13 on: November 01, 2007, 09:49:08 AM »
it's easy enough to see if you have a manual oil gauge. Just look up under the dash for a small oil-filled plastic tube.
 If you have a Haynes Repair book you might find some info about the wire. There is a switch in the tranny that  somehow controls vacuum advance when the engine temp is low. It's the TCS (trans controlled spark) system. An emissions thing.
 
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87 Chevy Silverado

Offline 76_Scottsdale

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Re: Mystery Wire?
« Reply #14 on: November 01, 2007, 11:52:49 AM »
I don't have any emissions junk like that on this pickup. I looked in my Haynes and there's jack diddly about the wire.
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1976 Scottsdale K20
350 C.I.D.
700R4
NP205
2 1/2" Lift
305/70/R16 BFG MT
True Dual 3" Flowmaster 40 Series Exhaust
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