Troubleshooting the horn
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Mountain Pass
Joined: Mar 2018
Posts: 233
Likes: 2
From: Puyallup, WA
Troubleshooting the horn
I've tried taking a wire from the horn directly to the battery and it makes noise. I've also checked the fuses. What else can I check to troubleshoot a bad horn?
My cluster lights dont work either, dunno if that could be related.
My cluster lights dont work either, dunno if that could be related.
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
cruise control or no cruise control?
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
ok that rules out a horn relay.
take and use a test light at the horn.
unplug wire connect test light to geound and press horn. Does the wire show power?
most likely not since horn doesnt work but does when you bypass the wiring.
after that check the horn wire at the column. One wire should be hot to the horn all the time the other wire should only be hot when horn is applied. If you have power before horn but not after then your horn pad is bad which it most likely is since no fuse is blown and it doesnt work.
if you want to bypass the testing you could press firm on hron and wiggle the horn button around scraping the metal inside the switch see if it starts or tries to work. If it does then its your horn pad. If its bad enough it still wouldnt work so your forced to check the wiring in the end
take and use a test light at the horn.
unplug wire connect test light to geound and press horn. Does the wire show power?
most likely not since horn doesnt work but does when you bypass the wiring.
after that check the horn wire at the column. One wire should be hot to the horn all the time the other wire should only be hot when horn is applied. If you have power before horn but not after then your horn pad is bad which it most likely is since no fuse is blown and it doesnt work.
if you want to bypass the testing you could press firm on hron and wiggle the horn button around scraping the metal inside the switch see if it starts or tries to work. If it does then its your horn pad. If its bad enough it still wouldnt work so your forced to check the wiring in the end
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
can touch wires togeter and check for continuity on pad.
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
There is a set of brushes on the backside of the steering wheel that are a good place to check if none of your tests up there work.
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Mountain Pass
Joined: Mar 2018
Posts: 233
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From: Puyallup, WA
Went to the junkyard today for the "exclusive day before the sale" sale and picked up a new horn pad, and a brake controller for 50% off. The new horn pad tests continuity when I press on the left or the right and is the same color!
I'll get back to my truck shortly and report back my findings.
I'll get back to my truck shortly and report back my findings.
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Thread Starter
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Mountain Pass
Joined: Mar 2018
Posts: 233
Likes: 2
From: Puyallup, WA
So my horn as well as the new horn test for continuity but I'm not getting voltage under the horn pad.
This trucks wiring is a mess. All the fuses are ok but I'm not sure if maybe my issues aren't a fuse being missing. How do I know which ones I'm supposed to have, and what size in each?
How do I get into the column? I tried to take the ignition tumbler as I have doors and ignition that are key matched but I couldn't get the tumbler out and I don't remember seeing any wires while I had the column apart.
This trucks wiring is a mess. All the fuses are ok but I'm not sure if maybe my issues aren't a fuse being missing. How do I know which ones I'm supposed to have, and what size in each?
How do I get into the column? I tried to take the ignition tumbler as I have doors and ignition that are key matched but I couldn't get the tumbler out and I don't remember seeing any wires while I had the column apart.
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
Your ignition switch and it's wires are mounted on top of the column, down low behind the dash. You have to take the column shroud off, carefully take the PRND321 indicator string loose, and then take the two u-bolts loose under the column and let the column drop to see it good.
On page 108 in this link, you can see on the left the horn without cruise. From the diagram you can see you should have a yellow/lightblue feeding the horn switch, and a darkblue leaving to feed the horns directly.
Horn & Cigar Lighter - Gary's Garagemahal (the Bullnose bible)
In the link below on page 13 is a picture of the 1986 fuse box.
Fuse Panel & Circuit Protection - Gary's Garagemahal (the Bullnose bible)
On page 108 in this link, you can see on the left the horn without cruise. From the diagram you can see you should have a yellow/lightblue feeding the horn switch, and a darkblue leaving to feed the horns directly.
Horn & Cigar Lighter - Gary's Garagemahal (the Bullnose bible)
In the link below on page 13 is a picture of the 1986 fuse box.
Fuse Panel & Circuit Protection - Gary's Garagemahal (the Bullnose bible)
Lead Driver
Joined: Apr 2007
Posts: 5,958
Likes: 105
From: Houston
for fuses your best bet is the owners manual. If manual is missing check auto literature places like Lloyd Auto lit or Faxon Auto Lit.
I got my owners manual for my '82 from there. How ever I have it put up some where as my cardboard glove box gets wet from the dealer ac. Need to modify the plastic glove box liner I have to work with my dealer air.
I got my owners manual for my '82 from there. How ever I have it put up some where as my cardboard glove box gets wet from the dealer ac. Need to modify the plastic glove box liner I have to work with my dealer air.
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