Cant Figure Out What This Stupid Wire Is For!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orange72350 · 06-22-2003, 02:11 AM

I recentley yanked out my stock 350 to swap with a re-built. im trying to sort out wiring in the engine bay. it was a rats nest from the last guy. Theres a black wire, with a cap on the end of it. The inside of the cap has a female spade connector in it. it runs in the same group of wires as my yellow for my ignition, and my two starter wires. its not a tach, and it isnt real long. I figure its gotta be a sending unit of some sort, but i cant figure out what its for. I dont remember taking it off the old motor, but its not full of oil and road crud, so it was obviosly hooked up recentley. Could somebody please bail me out before i just cut it off and realize later that i made a mistake!! Thankx for all yer help

Dale

Als454 · 06-22-2003, 03:57 AM

I don't have my truck here right now so I can't check. It doesn't go to the heater blower motor does it?

TERRYP · 06-22-2003, 04:11 AM

look where it goes thru the firewall, and look in a Haynes manual to see what it is for.

blue_69 · 06-22-2003, 07:04 AM

sounds like the reverse light switch wire that would plug into a switch on the tranny. On a 4 speed its on the top just foward of the shifter dont remember what side though.

jason

da-burb · 06-22-2003, 07:39 AM

if you have an auto it is the TSC presure switch harness. On the right side of your tran towards the top you will see it with 1 spade terminal. It lets the emissions equipment function when the tranny is in 3rd gear.

orange72350 · 06-23-2003, 01:07 AM

i dont think it goes to the tranny. it goes back through the firewall, and isnt very long. i dont wanna trace the harness 2 see what its for, but i dunno.

alta-aj · 06-23-2003, 02:09 AM

AS above.

jef5150 · 06-23-2003, 02:38 AM

i think da-burb is correct,my wiring diagram shows black wire,(auto) for "asm TCS switch"

06-22-2003, 02:11 AM	#1
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	Cant Figure Out What This Stupid Wire Is For!!! I recentley yanked out my stock 350 to swap with a re-built. im trying to sort out wiring in the engine bay. it was a rats nest from the last guy. Theres a black wire, with a cap on the end of it. The inside of the cap has a female spade connector in it. it runs in the same group of wires as my yellow for my ignition, and my two starter wires. its not a tach, and it isnt real long. I figure its gotta be a sending unit of some sort, but i cant figure out what its for. I dont remember taking it off the old motor, but its not full of oil and road crud, so it was obviosly hooked up recentley. Could somebody please bail me out before i just cut it off and realize later that i made a mistake!! Thankx for all yer help Dale __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

06-22-2003, 03:57 AM	#2
Als454 Senior Member Join Date: Jan 2002 Location: Vienna, Ohio, USA Posts: 259	I don't have my truck here right now so I can't check. It doesn't go to the heater blower motor does it? __________________ 72 Chevy A/C P/B P/S Tilt 454 Engine 400 TCI Trans C30 Frame C10 Suspension Short Wheel Base (Dually)

06-22-2003, 04:11 AM	#3
TERRYP GYRO GEARLOOSE Join Date: Jun 2000 Location: Nevada City, CAEverett, WA Posts: 361	look where it goes thru the firewall, and look in a Haynes manual to see what it is for. __________________ Nevada City, CA Everett, Washington 57 3/4 rat, 235, 3spd 66 C-10 Panel, SWB. 350 from '68, 200R4 tranny, 3.07 rear ratio, restoring 68 C10 LWB 350 4spd, 4.56 rear dump runner 82 Camaro, 305, THM-200-R4 84 Monte Carlo 305 TH350, land tuna 85 Tercel SW, snow runner DISGRACED OUTLAW MEMBER OF THE DRUM BRAKE CLUB

06-22-2003, 07:04 AM	#4
blue_69 someday Join Date: Dec 2001 Location: canastota,new york Posts: 629	sounds like the reverse light switch wire that would plug into a switch on the tranny. On a 4 speed its on the top just foward of the shifter dont remember what side though. jason __________________ Click Here to search ebay for all 67-72 parts My 72 CST blazer build 72 CST Blazer 4x4 67 2wd swb ( project onion crate ) 86 4x4 lwb plow truck 40 x 60 foot barn to work on all this stuff

06-22-2003, 07:39 AM	#5
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	if you have an auto it is the TSC presure switch harness. On the right side of your tran towards the top you will see it with 1 spade terminal. It lets the emissions equipment function when the tranny is in 3rd gear. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

06-23-2003, 01:07 AM	#6
orange72350 Registered User Join Date: Jan 2003 Location: Cold, Snowy High Level, Alberta Canada Eh Posts: 394	i dont think it goes to the tranny. it goes back through the firewall, and isnt very long. i dont wanna trace the harness 2 see what its for, but i dunno. __________________ 2003 yamaha raptor. Stock, but it still hauls!!!! 2000 skiddo mxz 700. Camoplast 1.5 inch track, jaws twin pipes, b+b can, custom built and weighted clutch, wiseco piston, high comp heads. its very fast. wow. 72 c-10 longbox. Bright Orange. Brand new 350, rv cam, performer intake, qjet, headers, 2 1/2 inch exhaust into hooker areo chamber mufflers. Body work coming soon. "dont let yer mind wander, its to little to go places by itself." "Forget the herse, cause i'll never die"-ACDC Back In Black "If It's To Loud, Yer Just Too Old" "I Love Anything Fast Enough To Do Something Stupid In" "Instant idiot, just add beer!!""

06-23-2003, 02:09 AM	#7
alta-aj Registered User Join Date: Aug 2001 Location: Qualicum Beach, B.C>, Canada Posts: 117	How about the temp sending unit? AS above.

06-23-2003, 02:38 AM	#8
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	i think da-burb is correct,my wiring diagram shows black wire,(auto) for "asm TCS switch" Last edited by jef5150; 06-25-2003 at 06:26 AM.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.