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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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Its a bit difficult to make out which is the actual slip ring in the first picture, but its a round track on the back of the steering wheel that the contact button rides on, and is about in the middle. The contact buttons are on the top of the column and spring loaded. One is being measured in the second picture. Even with the stock parts, the horn contact buttons don't ride in exactly the middle of the ring. I suppose that's because the column is used on everything from Lincolns to Mercurys, and they also had to work around the turn signal switch. I don't recall if there are actually two rings and two buttons, or just one- it looks like there could be two- an innie and an outie. That is power in, through the rim blow switch and back out to the horns. I see what looks like a second contact button above the caliper. I do remember laying out the tracks in CAD and finding that none of the aftermarket columns match the slip rings on a Ford wheel, so if someone wants to use a stock wheel you need a Ford column. I have no clue what is going on dimensionally with a Grant wheel.

..

mustang steering wheel2.jpg

slip ring c.jpg

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I have stock horns and rim blow steering wheel.  I placed a relay between the radiator support and  the battery, hidden from sight, without do any cutting to the stock wiring.  Unplug the female horn connector insert a male blade connector, connect the other end to the relay.  From the relay run a wire with blade connector, and plug into horns, From the relay run a short wire to the starter relay, place a inline fuse for safety. The horn work great now, before the relay it sound so goofy I was embarrassed to honk the horn.

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21 hours ago, dream car said:

I have stock horns and rim blow steering wheel.  I placed a relay between the radiator support and  the battery, hidden from sight, without do any cutting to the stock wiring.  Unplug the female horn connector insert a male blade connector, connect the other end to the relay.  From the relay run a wire with blade connector, and plug into horns, From the relay run a short wire to the starter relay, place a inline fuse for safety. The horn work great now, before the relay it sound so goofy I was embarrassed to honk the horn.

I did pretty much the same thing.  Added it to existing wires and hooked it up just like the headlight relay.    Looking back, it would have been better to add it with the headlight relay, it would have been easier. 

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