Horn Electrical - Vintage Mustang Forums
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post #1 of 6 (permalink) Old 07-07-2019, 01:04 PM Thread Starter
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Horn Electrical

I have a 69 FB with an aftermarket steering column...and two newly bought cheapest NPD horns....when I try to wire one horn it works (either one)...but when I try to wire both...it only grunts...I ran a wire direct to the battery for both...and still the issue...is this just low voltage from battery or another issue...I even ran it to a jump battery...is this just a bad horn buy?
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post #2 of 6 (permalink) Old 07-07-2019, 01:46 PM
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Originally Posted by Mark Harvey View Post
I have a 69 FB with an aftermarket steering column...and two newly bought cheapest NPD horns....when I try to wire one horn it works (either one)...but when I try to wire both...it only grunts...I ran a wire direct to the battery for both...and still the issue...is this just low voltage from battery or another issue...I even ran it to a jump battery...is this just a bad horn buy?
Check the grounds, before condemning the horn. Most, if not all, horns are enabled through connecting to ground.

KenA..
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post #3 of 6 (permalink) Old 07-07-2019, 05:30 PM Thread Starter
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both are direct to battery...will try seperate lines....batt is at 7.5 volts...charging it now.
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post #4 of 6 (permalink) Old 07-07-2019, 05:56 PM
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Originally Posted by Mark Harvey View Post
both are direct to battery...will try seperate lines....batt is at 7.5 volts...charging it now.
It is a good maintenance point to have available a trickle charger connected to your mustang's battery full time when not in use.
I have a CTEK connected 24/7 when garaged. The battery is always fully charged and ready for action.

This is among the best
https://www.amazon.com/CTEK-40-206-5...-2-spons&psc=1
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KenA..
64 1/2 Poppy Red Cvt. Resto-Mod
333 Cu.in. T5z, 3:55, Dual 40 mm DCOE Webers
Performer RPM, CI cam, TFS/TWs, Tri-Ys, Discs w/Shelby Drums
Severna Park, Maryland
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post #5 of 6 (permalink) Old 07-07-2019, 10:25 PM
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I have a 66 with the same issue. When I bought the car it had after market horns on it, they worked but we're obviously wrong. I installed a pair of new SD repos and when both are hooked up nothing happens. Disconnect either and the one connected works. Definitely not a ground issue. And it's a new battery.
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post #6 of 6 (permalink) Old 07-08-2019, 08:39 AM
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This relay for the horn from NPD might help:

https://www.npdlink.com/product/rela...0001%26year%3D
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