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Old 05/18/18, 09:44 AM   #1
1strodeo
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Horn Help Please

Hello All,
I have a 75-77 turn signal switch so I believe it's wired for a relay because only the blue/yellow wire comes out of the column, and my yellow wire from the light switch is not connected to anything.

If anyone could give advice on how I should wire this up I'd appreciate it. I've never added a relay to a system before.

This EB has a 72 wiring harness, thanks.

Jeff

1966 LUBR, 170 3spd, 2.5" SL, 1" BL, 31x10.5x15 on steelies (tub under construction 3/2017-present) Tonko

1972 U15, '68 302 3spd, 2.5" SL, 1" BL, 35x12.50x15 on 94 Bronco wheels, neighborhood driver Frankie

I got a fever...and the only cure...is more Bronco
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Old 05/18/18, 10:26 AM   #2
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honest the bolder ran under me

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The later model column switch is expecting to see ground connection coming up through the steering column check continuity between the column and the frame. particularly on both sides of the of the rag joint. I think you will need a 1974 or later steering wheel for the contacts to work properly. The horn tracks are different between early steering wheel and the later steering wheel. You will also need a ground connection from the battery to the Frame if you don't have one someplace.

I haven't done this swap so you will need to consult both wiring diagrams to sort it out.
First thing to do is jumper the horns to the battery and make sure they work. I spent allot of time once trying to make a horn work when at one time when I verified power to the horn it didn't work because the horn was locked up inside. So test horn before diving in.

1974, stock 302, C4, BFG KM2 33x12.5x15, 8in rim, detroit rear, trutrac front 4.11 gearing, Warflairs,2.5" lift, chevy disc conversion, Hydraboost, owned since Christmas Eve 1977
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Old 05/18/18, 10:28 AM   #3
mattyq17
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Rodeo, I don't know if this will help, but Viper sent this to me when I was adding a flaming river column to my 66.
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66, 289, C4, D44, upgrading as funds allow.
RIP Kason William Quaresma 07.06.10-08.18.10 you are loved and missed everyday
Emma Jean Quaresma 10.18.10-3.17.11 I love you baby girl
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Old 05/18/18, 11:32 AM   #4
1strodeo
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good stuff, thanks guys. I have a TBP aftermarket wheel, so the horn button is grounded to the adapter housing...will this suffice for the 'ground connection' you're talking about Rusty?

I have battery to block and battery to body grounds, but not battery to frame. I'll take care of that this evening. I also have a pair of horns I bought for my 66 Mustang back in 2002 still in the packaging...surely they will work but I'll test em first.

1966 LUBR, 170 3spd, 2.5" SL, 1" BL, 31x10.5x15 on steelies (tub under construction 3/2017-present) Tonko

1972 U15, '68 302 3spd, 2.5" SL, 1" BL, 35x12.50x15 on 94 Bronco wheels, neighborhood driver Frankie

I got a fever...and the only cure...is more Bronco
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Old 05/18/18, 12:56 PM   #5
Rustytruck
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Just remember if you have problems with the horn Ford uses ground connection to trip the relay. the ground runs up the center shaft of the column then through the horn switch in your steering wheel and down and out to the relay. The stock 3 tab relay has a power line in and power line out to the horn and the ground for your horn relay.

in Vipers diagram above is a 4 post relay used in the same way as the old 3 post Ford relay. After the relay, power is sent to the horns, there is only one wire connection on the horn. The horn needs good clean ground connection through its mounting bolt and is usually mounted on the core support. This ground is supplied to the horn through the body ground back to the battery.

1974, stock 302, C4, BFG KM2 33x12.5x15, 8in rim, detroit rear, trutrac front 4.11 gearing, Warflairs,2.5" lift, chevy disc conversion, Hydraboost, owned since Christmas Eve 1977
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Old 05/19/18, 06:30 AM   #6
charlie6976
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Grand Coulee WA
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Quote:
Originally Posted by 1strodeo View Post
good stuff, thanks guys. I have a TBP aftermarket wheel, so the horn button is grounded to the adapter housing...will this suffice for the 'ground connection' you're talking about Rusty?

I have battery to block and battery to body grounds, but not battery to frame. I'll take care of that this evening. I also have a pair of horns I bought for my 66 Mustang back in 2002 still in the packaging...surely they will work but I'll test em first.
An engine to frame ground would take care of the battery to frame mount and might be easier. NixTrix pointed out that there is an unused bolt hole right side of the engine in front of the motor mount. That's where I connected a short motor to frame grounding strap. Just drill a hole in the frame and use a tapping bolt to thread it.
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Old 05/19/18, 08:11 AM   #7
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Quote:
Originally Posted by charlie6976 View Post
An engine to frame ground would take care of the battery to frame mount and might be easier. NixTrix pointed out that there is an unused bolt hole right side of the engine in front of the motor mount. That's where I connected a short motor to frame grounding strap. Just drill a hole in the frame and use a tapping bolt to thread it.
thanks Charlie and good timing, I was about to head out to the garage...but since my boy's ball game got cancelled I'm heading to the junkyard first to hunt for a fan shroud...can't believe the parts houses dont sell em, and if they do they're $125+

1966 LUBR, 170 3spd, 2.5" SL, 1" BL, 31x10.5x15 on steelies (tub under construction 3/2017-present) Tonko

1972 U15, '68 302 3spd, 2.5" SL, 1" BL, 35x12.50x15 on 94 Bronco wheels, neighborhood driver Frankie

I got a fever...and the only cure...is more Bronco
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Old 05/19/18, 08:02 PM   #8
1strodeo
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Still havenít wired anything but went to the yard today looking for a fan shroud (longshot I know) and pulled an Autolite horn from what looked like an early 50s Ford HD truck...canít wait to hear what it sounds like...gotta clean out the remnants of dirt dobbers first
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File Type: jpg EE9D054F-1845-4680-AEC1-6425B29807A8.jpg (79.7 KB, 12 views)
File Type: jpg 89DD69C4-57AA-4307-9ACF-820BBA0D7325.jpg (142.5 KB, 8 views)

1966 LUBR, 170 3spd, 2.5" SL, 1" BL, 31x10.5x15 on steelies (tub under construction 3/2017-present) Tonko

1972 U15, '68 302 3spd, 2.5" SL, 1" BL, 35x12.50x15 on 94 Bronco wheels, neighborhood driver Frankie

I got a fever...and the only cure...is more Bronco
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