1968 Dash Harness Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**damnyankee36** · 11-01-2023, 07:50 PM

I discovered something odd on a 68. The fuse box has the main harness coming out of the left side. The American Autowire harness I bought, (#33915), has the harness coming out the top.

I thought I got the wrong one but it specifically says it's for a 67-68. What's weird is that AAW's 69-72 harness, (#30100), shows the harness coming out the side like the 68 I have. The fuse layout is the same but it's upside down.

Is it possible that I have a late build and they started using the 69 harnesses in 68? I suppose it's possible that the harness was changed out but I have my doubts. It looks very aged and original.

How can I tell what the build date is without a build sheet?

EDIT:

Been doing some research. The rear end has E118 casting date. I'm gonna guess that's May 11, 1968. Fairly late in the model year.
The transmission is a TH400 with these #'s on the tag: 546 at the top right. At the bottom: CT-68-77380. The 546 is the Julian date, which didn't make sense until I saw a reference stating the date codes started January the year before. So that would make a Julian date of 181 or June 29, 1968. Close to the rear end cast date.

**HO455** · 11-02-2023, 09:54 AM

Another possibility is that as part of the ramp up to the new model year trucks they tested the installation of the style new harnesses with your truck.

Or there was a warranty issue with the original harness and the dealer replaced the bad one with a newer one.

These are things you need a time machine to know for sure.

**68 C10 Driver** · 11-02-2023, 01:11 PM

Damnyankee36, here is a look at the fuse block in my 68 C10. I will admit this is a new harness/fuse block, but it is identical to the one I removed. The view is as if you were looking up from the floor. I know you will probably ask, that rod connecting to the clutch pedal is the actuator rod for the hydraulic clutch master cylinder. I have noticed when looking at various 68 C10s, that the orientation of the fuse block varies. Some fuse blocks are horizontal, others are vertical. I do not know why that is unless it was how one assembly plant did it versus another. Mine was mounted horizontally from the factory with the original harness, so that is how I installed the new one.

**damnyankee36** · 11-02-2023, 01:19 PM

Thanks Driver. Do you have any idea what the build date is? Or even if it's an early or late build?

**damnyankee36** · 11-02-2023, 01:21 PM

Would anybody else be able to look at their fuse box and tell me if the main branch comes out of the top or left side of the box?

**68 C10 Driver** · 11-02-2023, 01:21 PM

Mine was Mar 1968. I will have to go look at the plate for the exact date, but I do know it was Mar.

**damnyankee36** · 11-02-2023, 01:23 PM

That's close enough. Thanks!

**pjmoreland** · 11-02-2023, 03:46 PM

My '68 was built in May and in Fremont, CA. The fuse panel is horizontal with the wire bundle exiting on the long side (top).

HoneyBeeMan68 · 11-03-2023, 06:20 PM

mine comes out the top, and is the original one and was made in St. Louis.

ZEKE68 · 11-03-2023, 09:42 PM

My 1968 was built in Fremont CA, in October 1967, and the harness comes out of the top of the fuse box.

**Jason Banks** · 11-14-2023, 06:17 PM

I'm late but thought I'd update.

I have 2 1968... One of them an October 1967 Fremont truck like ZEKE68 and it comes out the top.

The other is a later Janesville build and it also comes out the top.

11-01-2023, 07:50 PM	#1
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	1968 Dash Harness Question I discovered something odd on a 68. The fuse box has the main harness coming out of the left side. The American Autowire harness I bought, (#33915), has the harness coming out the top. I thought I got the wrong one but it specifically says it's for a 67-68. What's weird is that AAW's 69-72 harness, (#30100), shows the harness coming out the side like the 68 I have. The fuse layout is the same but it's upside down. Is it possible that I have a late build and they started using the 69 harnesses in 68? I suppose it's possible that the harness was changed out but I have my doubts. It looks very aged and original. How can I tell what the build date is without a build sheet? EDIT: Been doing some research. The rear end has E118 casting date. I'm gonna guess that's May 11, 1968. Fairly late in the model year. The transmission is a TH400 with these #'s on the tag: 546 at the top right. At the bottom: CT-68-77380. The 546 is the Julian date, which didn't make sense until I saw a reference stating the date codes started January the year before. So that would make a Julian date of 181 or June 29, 1968. Close to the rear end cast date. Attached Images Last edited by damnyankee36; 11-01-2023 at 09:29 PM.

11-02-2023, 09:54 AM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,382	Re: 1968 Dash Harness Question Another possibility is that as part of the ramp up to the new model year trucks they tested the installation of the style new harnesses with your truck. Or there was a warranty issue with the original harness and the dealer replaced the bad one with a newer one. These are things you need a time machine to know for sure. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

11-02-2023, 01:19 PM	#4
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: 1968 Dash Harness Question Thanks Driver. Do you have any idea what the build date is? Or even if it's an early or late build?

11-02-2023, 01:21 PM	#5
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: 1968 Dash Harness Question Would anybody else be able to look at their fuse box and tell me if the main branch comes out of the top or left side of the box?

11-02-2023, 01:21 PM	#6
68 C10 Driver Senior Member Join Date: Oct 2020 Location: Kathleen, GA Posts: 651	Re: 1968 Dash Harness Question Mine was Mar 1968. I will have to go look at the plate for the exact date, but I do know it was Mar.

11-02-2023, 01:11 PM	#3
68 C10 Driver Senior Member Join Date: Oct 2020 Location: Kathleen, GA Posts: 651	Re: 1968 Dash Harness Question Damnyankee36, here is a look at the fuse block in my 68 C10. I will admit this is a new harness/fuse block, but it is identical to the one I removed. The view is as if you were looking up from the floor. I know you will probably ask, that rod connecting to the clutch pedal is the actuator rod for the hydraulic clutch master cylinder. I have noticed when looking at various 68 C10s, that the orientation of the fuse block varies. Some fuse blocks are horizontal, others are vertical. I do not know why that is unless it was how one assembly plant did it versus another. Mine was mounted horizontally from the factory with the original harness, so that is how I installed the new one. Attached Images Last edited by 68 C10 Driver; 11-02-2023 at 01:17 PM.

11-02-2023, 01:23 PM	#7
damnyankee36 Senior Member Join Date: Sep 2002 Location: Alamogordo, NM Posts: 724	Re: 1968 Dash Harness Question That's close enough. Thanks!

11-02-2023, 03:46 PM	#8
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,002	Re: 1968 Dash Harness Question My '68 was built in May and in Fremont, CA. The fuse panel is horizontal with the wire bundle exiting on the long side (top). Last edited by pjmoreland; 11-03-2023 at 10:31 PM.

11-03-2023, 06:20 PM	#9
HoneyBeeMan68 Registered User Join Date: Mar 2022 Location: Northern, Iowa Posts: 55	Re: 1968 Dash Harness Question mine comes out the top, and is the original one and was made in St. Louis.

11-03-2023, 09:42 PM	#10
ZEKE68 Registered User Join Date: Jul 2012 Location: Space Coast, Florida Posts: 403	Re: 1968 Dash Harness Question My 1968 was built in Fremont CA, in October 1967, and the harness comes out of the top of the fuse box. __________________ 1968 SWB Step Side, Big Block, 4L80E , Running!

11-14-2023, 06:17 PM	#11
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,624	Re: 1968 Dash Harness Question I'm late but thought I'd update. I have 2 1968... One of them an October 1967 Fremont truck like ZEKE68 and it comes out the top. The other is a later Janesville build and it also comes out the top.

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