Full How-to Fix Intermediate Horn on 1st Gen 4Runner/Pickup with Pictures

[RAD4Runner]

Repeat: Do EXACTLY what I say on the post above, report back ...
ABSOLUTELY NO NEED TO TAKE ANYTHING APART. JUST VOLT DC SETTING ON THE MULTI-METER.. Yes one single setting on multi-meter and nothing else. (assistant may be needed).

... I ran 12V directly from the battery to the disconnected horn to make sure that it worked. It made a noise.

So horn itself is good.

...I had my wife press the horn button in the cab while I measured the voltage across the connector. It read approximately 0.2 volts

This does not tell us anything because you did not check if there is 12V to the positive and the negative side of the horn with horn connected as I suggested above.
0.2 volts is noise the DMM picks up.

I then removed the steering wheel to check the pin. It is in good condition and making contact with the ring on the steering wheel.

How did you verify that it is making good contact? Did you use ohms?

I then jumpered the pin to the steering shaft (ground). No noise.

If you do not have 12V at the horn, like I said to check in original link, you will not get any sound, no matter how good your switch, pin, steering column, ground are.

Using my multi-meter, I measured between the pin and the steering shaft and got a reading of 0 volts, with a jumper and without a jumper.

This VOLTAGE check will only tell us something if you say whether you did this check with horn button pressed or not, and whether the horn was connected or not.

 

[RAD4Runner]

ADMINS: Kindly Revise Title to say "INTERMITTTENT", instead of Intermediate

ADMINS: Kindly Revise Title to say "INTERMITTTENT", instead of Intermediate
To help facilitate future searches.

 

[ev13wt]

I have this issue now. How is that horn holding up with the casing?

Will it wear through the ring maybe? Is the ring a soft metal?

 

[jsabowabo]

I don't have 12v power at the green/red wire to my horn. I do have 12v constant power to the other wire.

Checked the 15A fuse, which is good. There's no horn relay on my 89, so that's not it. Help please! Thanks in advance.

 

[wallytoo]

I have this issue now. How is that horn holding up with the casing?

Will it wear through the ring maybe? Is the ring a soft metal?

heh. missed your post from two years ago. but, my horn with 22 shell still works, 7 years later...

 

[RAD4Runner]

heh. missed your post from two years ago. but, my horn with 22 shell still works, 7 years later...

Sometimes it sounds like there's a kitten on my steering column when I turn so,I guess it's time to look in there. Might as well have the replacement contact on-hand to save time.
It would cost me more man-hours trying to find a 22-cal shell than it would to buy PN84312-20011, Plate Horn Contact so I did the latter from McGeorge Toyota. Heck, shipping cost more than the part but...OH WELL... (RIP, Peter Green)
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[RAD4Runner]

Testing Circuit From Contact Pin and upstream...

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