wiring harness help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

yellowGT · 03-18-2009, 09:50 AM

went out to start my truck (69)and it wouldnt start. It turned over the first time but then nothing after that. I got under the dash and the harness looked like the wires melted together so obviously something is shorting out. I think. I yanked that harness out and replaced it with a harness that came out of my 68 and same thing. I have power to the hei, nothing at the fuse block. Will the safety switch have to be plugged in? What can you tell me about the wire colors that run to the ignition? I do remember the capacitor or whatever that thing is on the core support was not plugged in before when truck started so I dont think thats the issue. What can you guys make out of this problem? Would i need a harness out of a 69?
Much help appreciated.

gcburdic · 03-18-2009, 11:15 AM

I am not sure on this, BUT try this thread...it is a colored wiring diagram

http://67-72chevytrucks.com/vboard/s...d.php?t=185665

yellowGT · 03-18-2009, 12:27 PM

I show power at the batt terminals if clipped directly but then ground to the frame or other spots and touch the pos. side of batt and it powers up on and off. Hei has power. No horn no turn signals or lights. Its a big mess

**Classic Heartbeat** · 03-18-2009, 01:42 PM

I wouldn't mess around with the old wires. Sounds like you are lucky that a fire didn't start up. You have a dead short somewhere. It could be the purple starter wire is shorted against the motor somehow. I am having to completely rewire a 72 Blazer here because the owner tried to patch the wiring together and it wouldn't start, nor would the brake lights and right rear turn signal work. Replace the wiring with new and save yourself the headaches of trying to chase wiring gremlins around. WES

Kayotic · 03-18-2009, 03:57 PM

I hate trying to trouble shoot wiring with words but,

Do you have the second wire off the positive side that goes to the little junction on the passenger fender?

My truck wont start unless it's connected but causes the poss. battery terminal to get hot.

Also check the jumper connection on the starter, mine has two copper leads comming from the selonoid, make sure that is good and tight...

**LockDoc** · 03-18-2009, 10:10 PM

Quote:

Originally Posted by yellowGT

Will the safety switch have to be plugged in? Much help appreciated.

Everyone seemed to miss this part. Yes, the neutral safety switch will have to be plugged in or a jumper wire connecting the Purple wires at the plug... Just remember if you do that it will start in gear. Don't run it through the back of the garage...

LockDoc

yellowGT · 03-18-2009, 10:49 PM

Thank you to the guys who responded. I got to messing with the truck again today after i got home from work and finally figured the problem out. I got to say I couldnt of done it without my expertise.

**El Jay** · 03-19-2009, 07:45 PM

What was the problem?
Inquiring minds want to know.

03-18-2009, 09:50 AM	#1
yellowGT Registered User Join Date: Jan 2006 Location: Garland, TX Posts: 970	wiring harness help went out to start my truck (69)and it wouldnt start. It turned over the first time but then nothing after that. I got under the dash and the harness looked like the wires melted together so obviously something is shorting out. I think. I yanked that harness out and replaced it with a harness that came out of my 68 and same thing. I have power to the hei, nothing at the fuse block. Will the safety switch have to be plugged in? What can you tell me about the wire colors that run to the ignition? I do remember the capacitor or whatever that thing is on the core support was not plugged in before when truck started so I dont think thats the issue. What can you guys make out of this problem? Would i need a harness out of a 69? Much help appreciated. __________________ '84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 Last edited by Longhorn Man; 03-18-2009 at 04:48 PM. Reason: removed WTB

03-18-2009, 11:15 AM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: wiring harness help I am not sure on this, BUT try this thread...it is a colored wiring diagram http://67-72chevytrucks.com/vboard/s...d.php?t=185665 __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

03-18-2009, 12:27 PM	#3
yellowGT Registered User Join Date: Jan 2006 Location: Garland, TX Posts: 970	Re: wiring harness help I show power at the batt terminals if clipped directly but then ground to the frame or other spots and touch the pos. side of batt and it powers up on and off. Hei has power. No horn no turn signals or lights. Its a big mess __________________ '84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3

03-18-2009, 01:42 PM	#4
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: wiring harness help I wouldn't mess around with the old wires. Sounds like you are lucky that a fire didn't start up. You have a dead short somewhere. It could be the purple starter wire is shorted against the motor somehow. I am having to completely rewire a 72 Blazer here because the owner tried to patch the wiring together and it wouldn't start, nor would the brake lights and right rear turn signal work. Replace the wiring with new and save yourself the headaches of trying to chase wiring gremlins around. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

03-18-2009, 03:57 PM	#5
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: wiring harness help I hate trying to trouble shoot wiring with words but, Do you have the second wire off the positive side that goes to the little junction on the passenger fender? My truck wont start unless it's connected but causes the poss. battery terminal to get hot. Also check the jumper connection on the starter, mine has two copper leads comming from the selonoid, make sure that is good and tight... __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016 Last edited by Kayotic; 03-18-2009 at 03:59 PM.

03-18-2009, 10:49 PM	#7
yellowGT Registered User Join Date: Jan 2006 Location: Garland, TX Posts: 970	Re: wiring harness help Thank you to the guys who responded. I got to messing with the truck again today after i got home from work and finally figured the problem out. I got to say I couldnt of done it without my expertise. __________________ '84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3

03-19-2009, 07:45 PM	#8
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: wiring harness help What was the problem? Inquiring minds want to know. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

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