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Username Post: 85 C10 horn wiring in column        (Topic#357858)
Mad Professor 
Contributor
Posts: 106

Reg: 12-30-08
08-29-19 03:55 AM - Post#2774370    

Trying to get horn working for RMV inspection.

Horns work with jumper from battery.

Horns work with plug to horn relay jumped (big wires, hot to horns)

Horns work with relay hooked up and wire to column grounded (relay O.K.)

Horns don't work with horn button on column

Horns come on when steering wheel turned (short to ground someplace inside column).

I just got a puller for the steering wheel so that will be next. The parts for horn button seem in order. Jumping to ground here horn does not work.

My question is where do I look for short/open once steering wheel is off? There seems to be a likely part, the canceling cam that also has the horn contact parts (spring/plunger/button).

How does wire from relay into column complete/hook up here?

Should battery be disconnected to work on this or can I just unplug the relay?

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
gchemist 
Senior Chevytalk Moderator
Posts: 24976
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-29-19 04:03 AM - Post#2774373    
    In response to Mad Professor

Check the contact spring. Usually corrosion or spring length are issues. Clean the horn button contact point. The part under the emblem cover.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
Mad Professor 
Contributor
Posts: 106

Reg: 12-30-08
08-29-19 04:26 AM - Post#2774376    
    In response to gchemist

One more question.

I had the column apart years ago on my 1989 S10 w/tilt column. I needed a special tool to compress a lock plate on the steering shaft so I could remove install a snap ring.

This C10 does not have tilt column. Will I still need above tool if I need to probe deeper into column? I want to have parts/tools in hand if possible as will need this truck to get to parts store.....

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
gchemist 
Senior Chevytalk Moderator
Posts: 24976
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-29-19 12:16 PM - Post#2774420    
    In response to Mad Professor

Yes, a u shape tool is needed press the plate down. I use a piece of uni strut and the column bolt to press it down.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
Mad Professor 
Contributor
Posts: 106

Reg: 12-30-08
08-31-19 07:01 AM - Post#2774556    
    In response to gchemist

Can I pull the spring and contact parts with removing the lock plate?

This is a PITA as have to take a bike or bus to get parts/tools.....

Also I have a spare column from a 78 C10, non-tilt, will parts interchange?

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







Edited by Mad Professor on 08-31-19 07:03 AM. Reason for edit: No reason given.

 
Mad Professor 
Contributor
Posts: 106

Reg: 12-30-08
08-31-19 09:15 AM - Post#2774564    
    In response to Mad Professor

I just got back, bus/bike, with tools and some parts.

I'm not sure where stuff is shorting/horn on, when I turn steering wheel. Horn button don't work.

The new turning cam did not come with the parts that contact the horn button . That sucked, tomorrow and a 10 miles bike ride if that is fubar parts. But do have a parts column that could be a donor (1978). I have the compessor for the streering locking plate to do that now.

I almost want to McGuyver a button/switch at this point

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
Mad Professor 
Contributor
Posts: 106

Reg: 12-30-08
09-07-19 02:27 PM - Post#2775017    
    In response to Mad Professor

Update on horn fix.

This is an 1985 that I purchased but never had on the road/inspected.

I took off the horn button parts, and the contact with the spring that goes down to the the turn signal canceling cam, was installed wrong. This is probably why prior owner disconnected the horn relay. As it would beep if you turned the steering wheel.

He had the spring in first, then the plastic retainer, with the contact upside down.

I corrected that. It was a PITA to get the plastic retainer pushed down and turned so it locked in place. I used a pair of fine point medical forceps.

I still had some issues with either the horn not working or staying on. I took the horn button parts from a spare 1978 column and cleaned up all the surfaces. All is well now and I didn't have to pull the column apart.

I now have some questions about backup light switch but I'll start a new thread for that.

Thanks for the advice gchemist!

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package







 
gchemist 
Senior Chevytalk Moderator
Posts: 24976
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-09-19 05:07 AM - Post#2775119    
    In response to Mad Professor

Nice find. I know about the spring because it has cause me trouble too.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
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