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No Horn Relay?

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Old Dec 17, 2010 | 02:23 PM
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No Horn Relay?

Hi there, new guy here. I brought a truck back from Georgia to Toronto a few weeks a go and I think it's crying because of the cold weather here. It's a 78 F150 short box 4x4, 400, auto. Every so often the horn goes off, just for about 10 seconds then it stops. I disconected the horn and thought it might be the relay shorting out. Problem is I can't find the relay. I know they're supposed to be on the passanger side inner fender but it's not there. I tried hitting the horn button with the horn disconnected to try and hear the relay click to locate it but there's nothing. The wiring from the hon goes into a factory bundle that goes along the firewall into the cab. Is it possable that some trucks don't have a horn relay?

Thanks in advance.
Dave
 
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Old Dec 17, 2010 | 02:42 PM
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if your truck is equipped with factory cruise control, the horn relay is mounted under the dash to the left of the steering column.
 
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Old Dec 17, 2010 | 04:31 PM
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Thanks, I'll look but this truck does'nt have cruise, or so I don't think it does or did...I also need a factory wiring diagram for under the dash. P/O did some hacking and I need to put it back to the factory way.

Thanks,
Dave
 
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Old Dec 17, 2010 | 05:53 PM
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78 & 79's only had a horn relay if it came with factory cruise control.
 
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Old Dec 17, 2010 | 07:18 PM
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That's correct; no horn relay on your year truck, if you really don't have cruise.
 
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Old Dec 17, 2010 | 09:41 PM
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Thanks, that makes sense. I'll check the horn pad buttons to see if they're sticking.

Thanks again
 
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Old Dec 18, 2010 | 04:11 PM
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Don't forget to check the fuses, or the horns themselves.
 
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