Turn signals cancels too early - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rpmerf · 09-07-2021, 07:49 PM

70 C20. Non tilt, not telescoping column. The turn signals seem to be working as intended, but they cancel too early for my taste. I have a road near me, where the road turns left, and I need to make a right turn. With the right turn signal on, the wheel only needs to turn about 1/8 turn to the left to click off the turn signal. I have to manually hold it while it is constantly trying to click off. I would like it to click off at closer to 1/4 to 1/2 turn.

Has anyone tried a replacement cam, or modifying the existing cam? The cam in my truck has 4 nubs on it. Looking at it installed, they are at about 2:00, 4:00, 7:30, and 10:30. The one that is really bugging me, is the nub at 2:00. I've been poking around online and see a bunch of these cams only have nubs at like 8:00 and 10:00. I'd really rather not modify my current cam, and I know that if I get a replacement, it will need to fit into the bearing like the current one does.

Thank you

Davidf · 09-07-2021, 07:53 PM

If it only cancels prematurely in one direction then that would indicate your wheel is not centered. Center the wheel. Otherwise, you will need to find a different cam/horn ring or mod the one you have.

rpmerf · 09-07-2021, 08:08 PM

It does do it both ways. I spent a bit of time looking at how it all lines up and when what hits where. I just notice it more on the one side because of a road on the way home.

I saw LMC has the stock cam for like $12, so I bought one. When I get it, I'll try cutting off the nubs at 2:00 and 4:00 and see if that gets me the results I'm looking for.

BigBird05 · 09-08-2021, 07:00 AM

Almost all of the cams from that vintage will fit your column. The biggest difference is the length of the horn projection. It is a different length for different steering wheels.

rpmerf · 09-08-2021, 10:05 AM

The main difference I saw was that the one I have is beveled at the edge. I believe it fits into the top bearing. Most of the ones I saw scrolling through Summit Racing have a flat bottom. These look like the one used on tilt columns with a spring.

I'll see how it goes modifying a stock cam first. If that isn't good enough, I'll look for another cam with a beveled edge.

**70STOVEBOLT** · 09-08-2021, 10:15 PM

Sub’d

**Warrens69GMC** · 09-08-2021, 10:37 PM

On my 1978, I pushed the pin for the cloverleaf, and rotated in the direction needed.

Worked like a charm.

rpmerf · 10-08-2021, 10:22 AM

I bought a replacement cam from LMC and cut the 2 back tabs off. It is a lot better now. I can turn on the right turn signal, and steer to the left without it cancelling. The 2 remaining cams do seem to be spaced a bit wide. It will cancel when I turn on the left turn signal, then get in a left turn lane. Other ones I saw online has those 2 cams close together. I'm wondering if I want to play with it a bit more. Cut off the 2 there and epoxy on a piece or 2 of rod.

09-07-2021, 07:49 PM	#1
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Turn signals cancels too early 70 C20. Non tilt, not telescoping column. The turn signals seem to be working as intended, but they cancel too early for my taste. I have a road near me, where the road turns left, and I need to make a right turn. With the right turn signal on, the wheel only needs to turn about 1/8 turn to the left to click off the turn signal. I have to manually hold it while it is constantly trying to click off. I would like it to click off at closer to 1/4 to 1/2 turn. Has anyone tried a replacement cam, or modifying the existing cam? The cam in my truck has 4 nubs on it. Looking at it installed, they are at about 2:00, 4:00, 7:30, and 10:30. The one that is really bugging me, is the nub at 2:00. I've been poking around online and see a bunch of these cams only have nubs at like 8:00 and 10:00. I'd really rather not modify my current cam, and I know that if I get a replacement, it will need to fit into the bearing like the current one does. Thank you __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

09-07-2021, 07:53 PM	#2
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: Turn signals cancels too early If it only cancels prematurely in one direction then that would indicate your wheel is not centered. Center the wheel. Otherwise, you will need to find a different cam/horn ring or mod the one you have.

09-07-2021, 08:08 PM	#3
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Turn signals cancels too early It does do it both ways. I spent a bit of time looking at how it all lines up and when what hits where. I just notice it more on the one side because of a road on the way home. I saw LMC has the stock cam for like $12, so I bought one. When I get it, I'll try cutting off the nubs at 2:00 and 4:00 and see if that gets me the results I'm looking for. __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

09-08-2021, 07:00 AM	#4
BigBird05 Registered User Join Date: Aug 2019 Location: Cheraw Posts: 1,300	Re: Turn signals cancels too early Almost all of the cams from that vintage will fit your column. The biggest difference is the length of the horn projection. It is a different length for different steering wheels.

09-08-2021, 10:05 AM	#5
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Turn signals cancels too early The main difference I saw was that the one I have is beveled at the edge. I believe it fits into the top bearing. Most of the ones I saw scrolling through Summit Racing have a flat bottom. These look like the one used on tilt columns with a spring. I'll see how it goes modifying a stock cam first. If that isn't good enough, I'll look for another cam with a beveled edge. __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z

09-08-2021, 10:15 PM	#6
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,450	Re: Turn signals cancels too early Sub’d __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

09-08-2021, 10:37 PM	#7
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,625	Re: Turn signals cancels too early On my 1978, I pushed the pin for the cloverleaf, and rotated in the direction needed. Worked like a charm. Attached Images __________________ 1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT

10-08-2021, 10:22 AM	#8
rpmerf Registered User Join Date: Feb 2011 Location: Parkville, MD Posts: 1,024	Re: Turn signals cancels too early I bought a replacement cam from LMC and cut the 2 back tabs off. It is a lot better now. I can turn on the right turn signal, and steer to the left without it cancelling. The 2 remaining cams do seem to be spaced a bit wide. It will cancel when I turn on the left turn signal, then get in a left turn lane. Other ones I saw online has those 2 cams close together. I'm wondering if I want to play with it a bit more. Cut off the 2 there and epoxy on a piece or 2 of rod. Attached Images __________________ 1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z



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