Horn Relay
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From: Richardson USA
Horn Relay
Does any one know where the horn relay on a 1987 F-150 302 is? I replaced the factory horn with an air horn and now I'm looking for the horn relay to replace it so it can handle the new horn. Does any one know where it is located? Help is very much appreciated.
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Horn Relay
If you have cruise, it's probably behind the cluster.
Dennis
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From: Richardson USA
Horn Relay
Thanks guys. I will check tomorrow when it is daylight to see if it is behind the cluster. I do have cruise control, and I'll try to listen for the click. If it is behind the cluster, do you think it will be reachable from up underneath the dash with the fuse cover removed, or do you think I'll have to pull the instrument cluster out? 
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Horn Relay
I've seen them mounted many place behind there.
1)Sometimes on the bottom of the dash beside the steering column.
2)Directly behind the speedometer
3)Attached to the speed control box
4)Seperatly on the firewall.
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1)Sometimes on the bottom of the dash beside the steering column.
2)Directly behind the speedometer
3)Attached to the speed control box
4)Seperatly on the firewall.
Dennis
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From: Richardson USA
Horn Relay
Awesome! Thank you so much. I will definitely check those places tomorrow. I posted this question at another place, but have yet to receive a reply, and now I get a detailed answer. THANK YOU!!!!!!!!! 
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Joined: Nov 2002
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From: Memphis, TN
Horn Relay
It's a silver metal box with 3 terminals and a big rubber connector holding the 3 wires. It's usually attached to the cruise module, which should be directly above the gas pedal inside the dash with 2 connectors at the bottom. If you pull the 2 mounting screws, you should find the horn relay on the back of the module.
But it's probably heavy enough to handle your aftermarket horns. In any case, you can install your extra relay in the engine compartment by connecting the original horn wire to the input of the relay and just don't worry about finding the one inside the dash.
But it's probably heavy enough to handle your aftermarket horns. In any case, you can install your extra relay in the engine compartment by connecting the original horn wire to the input of the relay and just don't worry about finding the one inside the dash.
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From: Richardson USA
Horn Relay
I've been bad, I haven't checked where it is yet, but I had the truck in today to get the heater coil replaced. The plan for tomorrow is to find the horn relay and replace it. I'm afraid the original isn't strong enough because when I honk, my headlights dim.
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Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Horn Relay
That doesn't indicate ANY problem with the relay - it indicates a problem with the GROUND that the horns & headlights share, or with power distribution (too much resistance somewhere like the starter relay terminals). It might also mean that the horns are pulling too much current, but the fuse should blow if that was it.
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From: Richardson USA
Horn Relay
Thanks for the help guys. We did find the horn relay by listening for the clicking up underneath the dash. But we did find that that wasn't the problem like one of ya'll suggested, so we checked the grounds and redid the negative terminal on the battery. The dim is less than it was before, but still not nearly gone
. We checked the old horns and they dimmed the light too, but barely noticeable in the daylight as they didn't take as much power to blast. So we have concluded that we can't keep the lights from dimming from the power draw of the new horn, but we did make it better. Thanks again for the help!
. We checked the old horns and they dimmed the light too, but barely noticeable in the daylight as they didn't take as much power to blast. So we have concluded that we can't keep the lights from dimming from the power draw of the new horn, but we did make it better. Thanks again for the help!