I found an error in the colored wiring diagram - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gkesseru · 10-15-2010, 08:40 PM

There are at tons of different copies of the C-10 color wiring diagram floating around on this forum and elsewhere. They all have the same mistake on the windshield wiper/washer area. The colored diagram shows a black wire from the switch connected to the second tab from the bottom and shorted to the yellow, when it should be all by itself one tab up and the yellow should be shorted to the other yellow wire. I discovered this because the PO cut off this part of the harness. I tried to find a picture of the proper wiring but all I found on this forum and also on the WEB was the color one, which is wrong. The picture in the shop manual is right.
NOTE: this picture is the one with the MISTAKE.

gkesseru · 10-15-2010, 10:06 PM

Here's the correct one from the manual

cadillacart · 10-15-2010, 10:35 PM

Good Catch! I had to stare at it a while to find the mistake.

DaSchlange · 10-15-2010, 10:42 PM

Nice, looks like we're missing a power wire. They both look practically identical so in my case I probably would have not noticed it and then had a wiper motor not work. Which is exactly my luck, haha.

**Dieselwrencher** · 10-15-2010, 10:56 PM

Nice find! I'm sure you saved a lot of people headaches!

gkesseru · 10-15-2010, 11:19 PM

Of course the reason I found it was because I followed the colored drawing and my wipers don't work. Now I can't even reach it since it is behind all the other wiring and the A/C hoses. Oh, well......

Has anyone else noticed that the Light Blue and the Dark blue are also reversed?
Which is correct?

**VetteVet** · 10-15-2010, 11:54 PM

I saw that before too and I just assumed it was a separate terminal because the diagram is so small. Thanks for pointing it out. The blue wires are for the two speeds but I'm not sure which is high and which is low. Did you blow the wiper fuse>

Here is a good site for the wiper motor.--http://rmcavoy.freeshell.org/electrical.html

10-15-2010, 08:40 PM	#1
gkesseru Registered User Join Date: Dec 2009 Location: California, Maryland Posts: 544	I found an error in the colored wiring diagram There are at tons of different copies of the C-10 color wiring diagram floating around on this forum and elsewhere. They all have the same mistake on the windshield wiper/washer area. The colored diagram shows a black wire from the switch connected to the second tab from the bottom and shorted to the yellow, when it should be all by itself one tab up and the yellow should be shorted to the other yellow wire. I discovered this because the PO cut off this part of the harness. I tried to find a picture of the proper wiring but all I found on this forum and also on the WEB was the color one, which is wrong. The picture in the shop manual is right. NOTE: this picture is the one with the MISTAKE. Attached Images __________________ 72 Fleet (died) 78 Step (sold) 55 Step named Fred (sold) 00 F150 68 Step (named El Scorcho by PO) Build thread for the new El Scorcho http://67-72chevytrucks.com/vboard/s...d.php?t=392932

10-15-2010, 10:06 PM	#2
gkesseru Registered User Join Date: Dec 2009 Location: California, Maryland Posts: 544	Re: I found an error in the colored wiring diagram Here's the correct one from the manual Attached Images __________________ 72 Fleet (died) 78 Step (sold) 55 Step named Fred (sold) 00 F150 68 Step (named El Scorcho by PO) Build thread for the new El Scorcho http://67-72chevytrucks.com/vboard/s...d.php?t=392932

10-15-2010, 10:35 PM	#3
cadillacart 1972 C/20 Join Date: May 2005 Location: Santa Rosa, Ca Posts: 273	Re: I found an error in the colored wiring diagram Good Catch! I had to stare at it a while to find the mistake. __________________ My Gallery 1972 C/20 402 Gramp's Truck

10-15-2010, 10:42 PM	#4
DaSchlange Registered User Join Date: Sep 2010 Location: Gainesville, MO Posts: 251	Re: I found an error in the colored wiring diagram Nice, looks like we're missing a power wire. They both look practically identical so in my case I probably would have not noticed it and then had a wiper motor not work. Which is exactly my luck, haha.

10-15-2010, 10:56 PM	#5
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: I found an error in the colored wiring diagram Nice find! I'm sure you saved a lot of people headaches! __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

10-15-2010, 11:19 PM	#6
gkesseru Registered User Join Date: Dec 2009 Location: California, Maryland Posts: 544	Re: I found an error in the colored wiring diagram Of course the reason I found it was because I followed the colored drawing and my wipers don't work. Now I can't even reach it since it is behind all the other wiring and the A/C hoses. Oh, well...... Has anyone else noticed that the Light Blue and the Dark blue are also reversed? Which is correct? __________________ 72 Fleet (died) 78 Step (sold) 55 Step named Fred (sold) 00 F150 68 Step (named El Scorcho by PO) Build thread for the new El Scorcho http://67-72chevytrucks.com/vboard/s...d.php?t=392932 Last edited by gkesseru; 10-15-2010 at 11:22 PM.

10-15-2010, 11:54 PM	#7
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,719	Re: I found an error in the colored wiring diagram I saw that before too and I just assumed it was a separate terminal because the diagram is so small. Thanks for pointing it out. The blue wires are for the two speeds but I'm not sure which is high and which is low. Did you blow the wiper fuse> Here is a good site for the wiper motor.--http://rmcavoy.freeshell.org/electrical.html __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. Last edited by VetteVet; 10-15-2010 at 11:58 PM.



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