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Author Topic: Hi Low Horn Electrical  (Read 1777 times)
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Ford428PI
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« on: February 29, 2016, 06:47:43 PM »

New guy here with a question about the Hi and Low horns on a '68 GT500.  Both horns work but not together.  Low works when Hi horn is disconnected and vice-versa.  Any help would be appreciated!

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Coralsnake
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« Reply #1 on: February 29, 2016, 07:05:36 PM »

I would start with a test light to see if it is the wiring or the horn.

With the horn disconnected, put the test light in the connector and sound the horn. Do that for each lead.

« Last Edit: February 29, 2016, 08:00:30 PM by Coralsnake » Logged

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Ford428PI
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« Reply #2 on: February 29, 2016, 07:14:10 PM »

Both work but not when both are connected.  Each works on its connection but only when the other is disconnected. idea

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Bob Gaines
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« Reply #3 on: February 29, 2016, 07:24:43 PM »

Both work but not when both are connected.  Each works on its connection but only when the other is disconnected. idea
Sounds like you have a bad connection in the harness some place. My guess at the turn signal switch connector or maybe corroded enough on the pins under the steering wheel or on the circular contacts on the bottom side of steering wheel that it is not getting a good connection . Only enough power getting through for one horn to work when two are connected it pulls the voltage down to below usable. Just my thoughts from the facts provided. 

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Ford428PI
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« Reply #4 on: February 29, 2016, 07:42:32 PM »

That gives me a starting place.  Thanks for the info. 

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Bob Gaines
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« Reply #5 on: February 29, 2016, 07:53:37 PM »

That gives me a starting place.  Thanks for the info. 
Make sure you have a good solid ground on the horns . A bad ground is the culprit on many electrical gremlins .

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BigBlock
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« Reply #6 on: March 01, 2016, 06:56:15 AM »

New guy here with a question about the Hi and Low horns on a '68 GT500.  Both horns work but not together.  Low works when Hi horn is disconnected and vice-versa.  Any help would be appreciated!

If you have checked the horn grounds then you could have burnt or corroded contacts that touch the horn ring under the steering wheel. You are not getting enough current through the circuit to fire both horns.
Remove the steering wheel and make sure all contact surfaces are clean and shiny. Also unplug the connector under the steering column and check the pins for corrosion. A final thought could be the horns have deteriorated and now require more current to vibrate.

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67289V8
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« Reply #7 on: March 14, 2016, 07:18:07 PM »

Just for kicks and giggles run a test lead wire for each horn directly to the positive battery post and touch them on the post at the same time, first ensuring you have good clean and tight grounds.

If they both blow at the same time then it's definitely somewhere else and eliminates the horns.

This troubleshooting exercise is essentially bypassing the entire horn circuit to just the horns.

Process of elimination.

« Last Edit: March 14, 2016, 07:23:43 PM by 67289V8 » Logged
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