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EastYorkStang

Adding a Horn relay

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46 minutes ago, EastYorkStang said:

Has anyone put in a relay in their ‘70 for the horn ? 

On mine I blow fuses. I’m running a Grant steering wheel which I thing is the reason. 

RPM's post on this thread describes how to install a relay for the horn, but don't know if 69 and 70 are the same.

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I'd figure the yellow wire is listed as the horn in the schematic/drawing from Ford. You'd need to research that. But since it's the only big yellow wire in the steering column it isn't hard to find. 

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I put a Bosch style relay under the dash in my 69' for the horn. Midlife is correct on the color codes for the wiring. I tapped into the yellow wire for the input power to the relay. I then cut the blue/yellow wire under the dash after it comes down from the turn signal switch. The blue/yellow wire on the switch end is used to trigger the relay, the other end is to the output of the relay to feed the horns. I have a rimblow switch, and this works very well because it takes the load of the horns off the switch. The relay now handles the heavy current.

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I did it also.  The horns would start with a normal sound, and a tenth second later would be a sick buzz like an alarm clock. They were not getting enough current through the horn switch and wires.  I added a relay at the horns, like the headlight relay.  

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If the slip ring on your aftermarket wheel doesn't line up with the steering column then adding a relay won't solve your problem. Many of aftermarket wheels are made for GM cars and don't match Ford columns. GM is a bigger market. Before adding a relay I would check the position of the slip ring track in relation to the contact button. The button is probably slipping off the track and shorting to ground, and since it is hot that takes out the fuse. Also you could check the amp draw on the horns- it should be around 13.9A for both.

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