Turn signal question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nachodog2 · 10-10-2010, 07:40 PM

What if any is the difference between a 64 gmc and chevy steering column wiring? I've been told they were different but not sure if they mean the connections or the wiring itself. Can anyone help?
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creep · 10-10-2010, 07:53 PM

When I replaced the turnsignal switch in my 63 the original part was a lot different than the replacement switch I got for a 63 Chevy. At first I ordered just the canceling cam but the switch in my GMC had electrical contacts built into the cam and the replacement piece didn't. I replaced the whole switch and now it works fine. The wires in the stock switch harness were different colors than the corresponding wires in the underdash harness but the replacement switch wires were the right colors.

**jocko** · 10-10-2010, 09:36 PM

Great question. This falls into the "funky years" for 60-66 chev/gmc steering column stuff. Here's what I "think" i know...

63 chev and 63-66 gmc cancelling cams are the same. 64-66 chev are a different part from the 63-66 gmc though.

64-66 marked new years for both chev and gmc turn signal switches, but they were not the same switches.

Something tells me I didn't answer your question... But I did confirm they are in fact supposed to be different. Another consideration is when chev and gmc came up with hazard flashers as standard - I'm not certain if they became standard in the same year - and for some reason I think gmc went with them as standard equipment first (and I'm talkin about built into the turn signal switch, not the external optional hazard flashers that mounted under the dash). So - IF (big if) gmc came out with hazards as standard in 64, that is probably the difference between the turn signal switches - haz flashers built into switch for gmc. They were still only options in chevs thru 66.

I have NO idea if that is the case - stuff I've heard here and there. Did YOUR truck have hazard flashers standard (it's a 64 gmc)?? Not sure I'm barking up the right tree here - but it's the only thing I can think of.

Maybe this post will jar someone's memory that knows the right answer. good luck.

10-10-2010, 07:40 PM	#1
nachodog2 Hell yeah!!! Join Date: Aug 2010 Location: canyon country Ca. Posts: 264	Turn signal question. What if any is the difference between a 64 gmc and chevy steering column wiring? I've been told they were different but not sure if they mean the connections or the wiring itself. Can anyone help? Posted via Mobile Device __________________ Stock is good but custom is the sh*t!

10-10-2010, 07:53 PM	#2
creep Registered Loser Join Date: Jun 2009 Location: Elyria, OH Posts: 1,523	Re: Turn signal question. When I replaced the turnsignal switch in my 63 the original part was a lot different than the replacement switch I got for a 63 Chevy. At first I ordered just the canceling cam but the switch in my GMC had electrical contacts built into the cam and the replacement piece didn't. I replaced the whole switch and now it works fine. The wires in the stock switch harness were different colors than the corresponding wires in the underdash harness but the replacement switch wires were the right colors. __________________ ((..)) ((0)) '63 GMC lwb, 383, th350, lays frame, genuine patina. The Build Thread - http://67-72chevytrucks.com/vboard/s...d.php?t=374267 '88 Astro cargo bagged, shaved, phantom grille. SOLD '50 Chevy 2 door sedan awaiting attention. 2014 Silverado Ext cab, 5.3, daily driver.

10-10-2010, 09:36 PM	#3
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Turn signal question. Great question. This falls into the "funky years" for 60-66 chev/gmc steering column stuff. Here's what I "think" i know... 63 chev and 63-66 gmc cancelling cams are the same. 64-66 chev are a different part from the 63-66 gmc though. 64-66 marked new years for both chev and gmc turn signal switches, but they were not the same switches. Something tells me I didn't answer your question... But I did confirm they are in fact supposed to be different. Another consideration is when chev and gmc came up with hazard flashers as standard - I'm not certain if they became standard in the same year - and for some reason I think gmc went with them as standard equipment first (and I'm talkin about built into the turn signal switch, not the external optional hazard flashers that mounted under the dash). So - IF (big if) gmc came out with hazards as standard in 64, that is probably the difference between the turn signal switches - haz flashers built into switch for gmc. They were still only options in chevs thru 66. I have NO idea if that is the case - stuff I've heard here and there. Did YOUR truck have hazard flashers standard (it's a 64 gmc)?? Not sure I'm barking up the right tree here - but it's the only thing I can think of. Maybe this post will jar someone's memory that knows the right answer. good luck.



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