What is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Benelli · 03-01-2010, 11:12 PM

1979 K10, 350, TH350, NP203.

I was cleaning out the linkage and found this random wire dangling. What could it be to?

Restrorob · 03-01-2010, 11:15 PM

Looks like the plug for the back up light switch....

Benelli · 03-01-2010, 11:16 PM

Oh. Might want to get that fixed.

95 S_Trucker · 03-01-2010, 11:17 PM

follow it.

it looks like it could be for the low range indicator in the dash, was it going under the truck between the floor and the t-case shifter boot?

edit: the back up switch is on the column, we are looking at an auto

Benelli · 03-01-2010, 11:18 PM

Well, I could tell the PO had taken off that panel shortly before I bought it and it was wedged between the access panel and the floor.

Gregs71 · 03-02-2010, 01:41 AM

I have a similar plug like that hanging down between the frame and the dr side gas tank. Except mine has two holes (yours appears to have one). My truck is a 1987 350/th400 4x4, and everything appears to work.

68 TT · 03-02-2010, 10:08 AM

Quote:

Originally Posted by Gregs71

I have a similar plug like that hanging down between the frame and the dr side gas tank. Except mine has two holes (yours appears to have one). My truck is a 1987 350/th400 4x4, and everything appears to work.

That looks like a T-400 kickdown connector that plugs into the driver side rear area of the T-400.

Damien · 03-02-2010, 01:51 PM

Quote:

Originally Posted by 68 TT

That looks like a T-400 kickdown connector that plugs into the driver side rear area of the T-400.

The th400 could have been swaped to a th350 or it could be for the tq converter lock on a th350C. I think '79 was the first year for the th350C. The th350C will have a plug on the passenger side of the trans near the dipstick tube and cooler lines.

68 TT · 03-02-2010, 02:15 PM

Quote:

Originally Posted by Damien

The th400 could have been swaped to a th350 or it could be for the tq converter lock on a th350C. I think '79 was the first year for the th350C. The th350C will have a plug on the passenger side of the trans near the dipstick tube and cooler lines.

I know the 700-R4 shares the same plug opening size in the case as the T-400 since you can use the T-400 plug on the 700-R4 when doing a transplant to wire up the TCC function. Makes sense that the T-350C used the same plug too.

Sounds like somebody swapped out an earlier T-350 for a worn out T-350C and just put the unused plug out of the way.

James McClure · 03-02-2010, 11:27 AM

It's a THM350 so the down shift is a cable. Back up lamps are on the colunm as is neutral start switch (in one switch) Is it possible it could be for a TCC? Look on the left side of the trans case for a connector (probably white) with 2 spades sticking out. I don't remember when they started with TCC transmissions. Jim

Prong · 03-02-2010, 05:38 PM

It looks just like the plug for the 4wd switch that bolts on to the Tcase shifter.

willett · 03-02-2010, 08:21 PM

my '78 203/400 has the same mystery connector hanging down.

i'm thinking its a low-range indicator.

i had always noticed it dangling around when i looked around the t-case area, and when i pulled the carpet i found it running along the floor and under the shift boot.

try hooking 12v up to it while the truck is not running and see if it lights anything in the dash up. and let me know!

ed. and my kickdown functions just fine without it connected.

USSkoval · 03-02-2010, 10:44 PM

+1 for 4x4 indicator.

03-01-2010, 11:12 PM	#1
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	What is this? 1979 K10, 350, TH350, NP203. I was cleaning out the linkage and found this random wire dangling. What could it be to? __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

03-01-2010, 11:15 PM	#2
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: What is this? Looks like the plug for the back up light switch.... __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!*

03-01-2010, 11:16 PM	#3
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Re: What is this? Oh. Might want to get that fixed. __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

03-01-2010, 11:17 PM	#4
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	Re: What is this? follow it. it looks like it could be for the low range indicator in the dash, was it going under the truck between the floor and the t-case shifter boot? edit: the back up switch is on the column, we are looking at an auto Last edited by 95 S_Trucker; 03-01-2010 at 11:18 PM.

03-01-2010, 11:18 PM	#5
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Re: What is this? Well, I could tell the PO had taken off that panel shortly before I bought it and it was wedged between the access panel and the floor. __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

03-02-2010, 01:41 AM	#6
Gregs71 Registered User Join Date: Nov 2006 Location: Amador County, Ca. Posts: 229	Re: What is this? I have a similar plug like that hanging down between the frame and the dr side gas tank. Except mine has two holes (yours appears to have one). My truck is a 1987 350/th400 4x4, and everything appears to work. __________________ 1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400

03-02-2010, 11:27 AM	#10
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: What is this? It's a THM350 so the down shift is a cable. Back up lamps are on the colunm as is neutral start switch (in one switch) Is it possible it could be for a TCC? Look on the left side of the trans case for a connector (probably white) with 2 spades sticking out. I don't remember when they started with TCC transmissions. Jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.

03-02-2010, 05:38 PM	#11
Prong Registered User Join Date: May 2007 Location: CO Posts: 475	Re: What is this? It looks just like the plug for the 4wd switch that bolts on to the Tcase shifter.

03-02-2010, 08:21 PM	#12
willett Another Day, Another Dollar Join Date: Nov 2008 Location: North Vancouver, BC Posts: 1,316	Re: What is this? my '78 203/400 has the same mystery connector hanging down. i'm thinking its a low-range indicator. i had always noticed it dangling around when i looked around the t-case area, and when i pulled the carpet i found it running along the floor and under the shift boot. try hooking 12v up to it while the truck is not running and see if it lights anything in the dash up. and let me know! ed. and my kickdown functions just fine without it connected. __________________ -78 K20 Cheyenne 454 long box, 4" lift, 35" MT's, '84 cab, '80 box "its hip to be square" Last edited by willett; 03-02-2010 at 08:23 PM.

03-02-2010, 10:44 PM	#13
USSkoval Registered User Join Date: Jul 2009 Location: West Jefferson, OH Posts: 999	Re: What is this? +1 for 4x4 indicator.

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