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Old 04-14-2018, 04:39 AM   #1
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Default Horn not working

My recently bought 1989 4 cylinder Hardbody has a non-working horn. I took the horn pad off the steering wheel, the contact switch looks good, no corrosion, not wore out. My positive battery post has no fuseable links hooked up to it, don't know if this would have anything to do with that. The truck starts up fine, all the lights work, no other issues so far.
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Old 04-14-2018, 04:58 AM   #2
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I'd check continuity through the switch and then do a direct wire from battery to horn and see if it sounds. If so you have a bad ground somewhere are are missing voltage somewhere.

Maybe start with a meter at the horn. Make sure you get a potential between the wire to the horn and the chassis of the truck (ground). If you got that you just need to test the horn its self. If that works you got a bad ground.
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Old 04-14-2018, 05:43 AM   #3
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Quote:
Originally Posted by Cabernet Frank View Post
My recently bought 1989 4 cylinder Hardbody has a non-working horn. I took the horn pad off the steering wheel, the contact switch looks good, no corrosion, not wore out. My positive battery post has no fuseable links hooked up to it, don't know if this would have anything to do with that. The truck starts up fine, all the lights work, no other issues so far.
I'll assume you have at least some power wires going from the positive side of the battery. Otherwise things wouldn't work. Better get some fusible links in between those power wires before you get an electrical fire through your harnesses somewhere. They can destroy a truck, and quickly, before you even have a chance to pull off a battery cable. You will hear a hissing sound, and that's a short spreading a fire through the harness. Your battery could even explode on you.
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Old 04-14-2018, 01:57 PM   #4
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Quote:
Originally Posted by Cabernet Frank View Post
My recently bought 1989 4 cylinder Hardbody has a non-working horn. I took the horn pad off the steering wheel, the contact switch looks good
Maybe change the fuse. With the horn button off, connect the horn electrical wire to a ground on the steering column. That should make the horn beep. If not, start working backwards.

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Old 04-14-2018, 03:23 PM   #5
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make sure it actually has the horn first, than if it does test the horn as was suggested, if the horn works I would try rotating the steering wheel to different positions and seeing if the horn works, if it works in a different position than it would be a problem with the contact on the back of the steering wheel and the pin that sticks out of the top of the steering column.
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Old 04-15-2018, 09:27 AM   #6
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If nothing else works, buy a better horn at Amazon, keep the mounting bracket on the truck with the bolts, and use IT to install the new horn. If power functions are positive, the steering wheel connection is good, the fuse isn't blown, but the horn doesn't work...it is probably the HORN.

It's a rare occurance, but it does happen. Check all the other stuff first. If you connect a hot lead to the positive side of the horn from the battery, and the horn doesn't sound, it's either the horn is no good, or the ground wire is loose. If it sounds, then it's at your steering wheel or the fuse is blown.
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Old 04-15-2018, 11:11 AM   #7
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Check the blue horn relay. If i remember correctly, it is on the driver fender pretty close to the coil and headlight area.
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Old 04-15-2018, 11:27 AM   #8
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The horn is pretty basic.

As shown in the attached pic from the d21_truck_1989 Service Manual on EL-73 (lower left), the horn switch goes to the horn relay and then to the horns.



If the horn switch is good, it should send a signal to the horn relay.

If the horn relay is good, it should pass power the horns. If it does not, the horn relay is corroded or your 10A fuse in the fuse block is not passing current.

If the horn relay is sending power when the horn switch is pressed, then the horns are not grounded.

Find out which part of your circuit is not working, and focus on that.
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Old 04-16-2018, 12:36 AM   #9
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When I first got my truck, the horn relay needed a good smack to get it unstuck.
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Old 04-16-2018, 04:11 AM   #10
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Quote:
Originally Posted by cadillacdude1975 View Post
When I first got my truck, the horn relay needed a good smack to get it unstuck.
When I got the recent 97, one of the relays that are mounted at the bottom of the fuse box was bad. You would tap on it, and dash lights, etc would come on. Tap again...they went OFF. I replaced the relay.

I would say if the horn switch in the steering wheel is good, and the fuse is NOT blown...time to look at the relay.
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