Latest Problems

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btoran
Posts: 630
Joined: Thu Aug 29, 2013 8:26 am
Your car is a: 1975 Fiat 124 Sport Spider
Location: Northport, NY

Latest Problems

Post by btoran »

Two problems started yesterday and I'm not sure if they have the same cause. First, my horn stopped working. When i hit the horn button, i can hear the relay clicking, but no sound comes from the horn. Next, when i turn the ignition off, the car continues to run until i turn the fuel pump off manually from a dash-mounted toggle switch. The car has been running fine this entire season (since early spring), until now. Thanks for your suggestions.
1975 Fiat 124 Spider
707kevin
Posts: 83
Joined: Sun Jun 28, 2015 12:55 am
Your car is a: 1975 124 Spider
Location: Oregon Coast

Re: Latest Problems

Post by 707kevin »

The horn should be easy. If the relay is clicking you're half way there.

Check for power on the horn relay output (Pin 30 to pin 87 should be +12v when the horn is activated.)

Test the horn by connecting test leads from a GOOD ground to the horn - and a good +12v (battery connector) to the horn + bypassing all switches.

The button works, and the under-dash wiring is good if you hear the relay click when activating the horn.
The failure is going to be a bad horn, bad wiring from the relay to the horn, bad ground from the horn, or bad relay. (yes, they can still click, but not contact internally and be bad)
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