Brown wire? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

KEH · 06-16-2003, 11:05 PM

What is the short brown/white wire in the engine harness that is the above fuse box terminals? I'm looking for somewhere to tap into for my electric choke, but this wire is not hot anyway. Any ideas? Thanks

jewels. · 06-16-2003, 11:37 PM

you might try checking out these wiring diagrams to see if this will help you. (if i suggested something for you, it would simply be from studying these diagrams)

Wiring Diagrams

good luck!
jewels.

*Gee_Emm* · 06-16-2003, 11:42 PM

I think that might be for the proportioning valve, does it have a boot on the end?

SEVEND2 · 06-17-2003, 12:10 AM

does it end up right behind your brake booster?

KEH · 06-17-2003, 12:27 AM

It only has 6" reach, with a female connector & no juice in any ignition position. This is a new b&h harness, but I know I've seen this on other trucks (most are tucked into the wire gutter). Before posting I looked at the wiring diagram & it looks like it comes off the heater fuse terminal. Anybody know?

SEVEND2 · 06-17-2003, 12:33 AM

I know the wire your talking about, i dont have mine hooked up, If i can rember right.... it went to the emmisions controler for Smog on my truck

bpmcgee · 06-17-2003, 08:36 AM

I believe that Sevend2 is right, I have a short wire there that went to the smog components. My wire, on the other hand, is hot with the ignition on and dead otherwise.

KEH, Is it possible that you mistested something or there's a fuse out that might cause this reading? I used this in the past for my electric choke, and I'm now using it to trigger the relay for my TBI computer with no problems.

Good luck,

Brian

fatfords · 06-17-2003, 10:15 AM

Brain and SEVEND2 are correct. The wiring diagram for the '72 shows this as one of the wires going to the TCS solenoid, that is part of the emissions package. I believe it goes to the fuse panel and is marked "radio/TCS". Like Brian said, it should be hot with the ignition on. I am using mine to lock up my 700R4 torque converter clutch.

Good Luck,
Kent

SEVEND2 · 06-17-2003, 12:45 PM

Ah yes, It does ring a bell for me, but it was not a consistant 12 vt for my electric choke, so i did not use it. (i metered it out today and it jumped from 13.5vt to 9 vt back and forth) the carb book says it need to be a constant for the choke) I would just tie it off for dead unless your running emmisions

garthdader · 06-18-2003, 02:36 PM

The brown wire is for your brake proportioner. For my electric choke I hooked it up to my old points distibutor wire. This is assuming that you are converted to HEI. It is hooked up through the ignition switch and is a hot wire. Hope this helps. Just look at the wiring diagrams and all of your questions will be answered.

KEH · 06-18-2003, 09:53 PM

garthdader,
The prop. valve is the light brown wire. The wire I'm talking about is dark brown. Anyway, I hooked the choke to the fuse box.
Thanks

06-16-2003, 11:05 PM	#1
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	Brown wire? What is the short brown/white wire in the engine harness that is the above fuse box terminals? I'm looking for somewhere to tap into for my electric choke, but this wire is not hot anyway. Any ideas? Thanks __________________ 1970 C/10 SWB Stepside

06-16-2003, 11:37 PM	#2
jewels. Registered User Join Date: Jul 2001 Location: Munster, IN Posts: 1,100	you might try checking out these wiring diagrams to see if this will help you. (if i suggested something for you, it would simply be from studying these diagrams) Wiring Diagrams good luck! jewels. __________________ 68 C10 Red Step 350 my first child & main focus 58 3200 Apache LWB Step the upcoming project

06-16-2003, 11:42 PM	#3
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 3,991	I think that might be for the proportioning valve, does it have a boot on the end? Last edited by Gee_Emm; 06-17-2003 at 12:14 AM.

06-17-2003, 12:10 AM	#4
SEVEND2 Registered User Join Date: Aug 2001 Location: Menifee, Calif, USA Posts: 2,146	does it end up right behind your brake booster? __________________ With a 1972 Chevy Custom-10 Long bed w/350cid th350, (under-construction). Progress on truck so far (follow link): http://67-72chevytrucks.com/vboard/s...ad.php?t=51051 and stage 2 http://67-72chevytrucks.com/vboard/s...ad.php?t=58132 ~ "Why couldn't you have just put the bunny back in the box?" ~

06-17-2003, 12:27 AM	#5
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	It only has 6" reach, with a female connector & no juice in any ignition position. This is a new b&h harness, but I know I've seen this on other trucks (most are tucked into the wire gutter). Before posting I looked at the wiring diagram & it looks like it comes off the heater fuse terminal. Anybody know? __________________ 1970 C/10 SWB Stepside

06-17-2003, 12:33 AM	#6
SEVEND2 Registered User Join Date: Aug 2001 Location: Menifee, Calif, USA Posts: 2,146	I know the wire your talking about, i dont have mine hooked up, If i can rember right.... it went to the emmisions controler for Smog on my truck __________________ With a 1972 Chevy Custom-10 Long bed w/350cid th350, (under-construction). Progress on truck so far (follow link): http://67-72chevytrucks.com/vboard/s...ad.php?t=51051 and stage 2 http://67-72chevytrucks.com/vboard/s...ad.php?t=58132 ~ "Why couldn't you have just put the bunny back in the box?" ~

06-17-2003, 08:36 AM	#7
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	I believe that Sevend2 is right, I have a short wire there that went to the smog components. My wire, on the other hand, is hot with the ignition on and dead otherwise. KEH, Is it possible that you mistested something or there's a fuse out that might cause this reading? I used this in the past for my electric choke, and I'm now using it to trigger the relay for my TBI computer with no problems. Good luck, Brian

06-17-2003, 10:15 AM	#8
fatfords Registered User Join Date: Sep 2002 Location: DFW, TX Posts: 350	Brain and SEVEND2 are correct. The wiring diagram for the '72 shows this as one of the wires going to the TCS solenoid, that is part of the emissions package. I believe it goes to the fuse panel and is marked "radio/TCS". Like Brian said, it should be hot with the ignition on. I am using mine to lock up my 700R4 torque converter clutch. Good Luck, Kent __________________ '56 F-100 (w/all GM stuff) Lookin' for another parts chaser! '05 GMC crew cab

06-17-2003, 12:45 PM	#9
SEVEND2 Registered User Join Date: Aug 2001 Location: Menifee, Calif, USA Posts: 2,146	Ah yes, It does ring a bell for me, but it was not a consistant 12 vt for my electric choke, so i did not use it. (i metered it out today and it jumped from 13.5vt to 9 vt back and forth) the carb book says it need to be a constant for the choke) I would just tie it off for dead unless your running emmisions __________________ With a 1972 Chevy Custom-10 Long bed w/350cid th350, (under-construction). Progress on truck so far (follow link): http://67-72chevytrucks.com/vboard/s...ad.php?t=51051 and stage 2 http://67-72chevytrucks.com/vboard/s...ad.php?t=58132 ~ "Why couldn't you have just put the bunny back in the box?" ~

06-18-2003, 02:36 PM	#10
garthdader Registered User Join Date: Sep 2002 Location: Atoka, Tn Posts: 64	The brown wire is for your brake proportioner. For my electric choke I hooked it up to my old points distibutor wire. This is assuming that you are converted to HEI. It is hooked up through the ignition switch and is a hot wire. Hope this helps. Just look at the wiring diagrams and all of your questions will be answered.

06-18-2003, 09:53 PM	#11
KEH Better late than never Join Date: Dec 2001 Location: Columbus, IN Posts: 324	garthdader, The prop. valve is the light brown wire. The wire I'm talking about is dark brown. Anyway, I hooked the choke to the fuse box. Thanks __________________ 1970 C/10 SWB Stepside



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