Horn only works if wheel is loose. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Duner97 · 06-11-2020, 11:56 AM

Been scratching my head on this one, maybe someone has seen this before...
72 c10 with Chevy van tilt column and grant steering wheel. Got my horn contacts in order and tested with everything worked. Tightened down the wheel and the horn button will not ground out. Unplugged the connector to the column and connected test light to check for ground. Nothing. I can loosen the wheel and once it backs off enough, I can test by shorting the horn contact wire to the shaft and it’s fine. However if I reinstall the wheel, OR with the wheel off, I can push down, hard, on the turn signal cancel cam, and I lose the ground. I can see the spring loaded plunger making contact on the cam, so its gotta be below that. Any idea on this?

**VetteVet** · 06-14-2020, 09:37 PM

Here's a thread with some pretty good pictures that may help you.

http://67-72chevytrucks.com/vboard/s...d.php?t=711090

Duner97 · 06-19-2020, 11:15 AM

Thanks for the reply, I found that thread while I was searching for some answers. Beings that it is a van’s tilt, and I have no idea if the turn signal cancel cam was from that, or the trucks column. (it’s been too many years) but it seemed to not fit right, so I trimmed down the cam about 1/16” so it won’t smash down on the bearing as much. At the same time, that causes the contact ring to touch the screw for the turn signal lever, grounding the horn circuit. But, nothing a little rtv glue and electrical tape couldn’t fix. We’ll see how long that last before the horn blares and I have to figure out the real fix!
Posted via Mobile Device

06-11-2020, 11:56 AM	#1
Duner97 Registered User Join Date: Jul 2002 Location: Arroyo Grande, CA Posts: 125	Horn only works if wheel is loose. Been scratching my head on this one, maybe someone has seen this before... 72 c10 with Chevy van tilt column and grant steering wheel. Got my horn contacts in order and tested with everything worked. Tightened down the wheel and the horn button will not ground out. Unplugged the connector to the column and connected test light to check for ground. Nothing. I can loosen the wheel and once it backs off enough, I can test by shorting the horn contact wire to the shaft and it’s fine. However if I reinstall the wheel, OR with the wheel off, I can push down, hard, on the turn signal cancel cam, and I lose the ground. I can see the spring loaded plunger making contact on the cam, so its gotta be below that. Any idea on this? Attached Images __________________ 72 SB 4x4 -Duner97

06-14-2020, 09:37 PM	#2
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,707	Re: Horn only works if wheel is loose. Here's a thread with some pretty good pictures that may help you. http://67-72chevytrucks.com/vboard/s...d.php?t=711090 __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

06-19-2020, 11:15 AM	#3
Duner97 Registered User Join Date: Jul 2002 Location: Arroyo Grande, CA Posts: 125	Thanks for the reply, I found that thread while I was searching for some answers. Beings that it is a van’s tilt, and I have no idea if the turn signal cancel cam was from that, or the trucks column. (it’s been too many years) but it seemed to not fit right, so I trimmed down the cam about 1/16” so it won’t smash down on the bearing as much. At the same time, that causes the contact ring to touch the screw for the turn signal lever, grounding the horn circuit. But, nothing a little rtv glue and electrical tape couldn’t fix. We’ll see how long that last before the horn blares and I have to figure out the real fix! Posted via Mobile Device Attached Images



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.