1968 Horn Relay
|The horn relay serves 2 main functions.
The screw terminals shown at the top serve as a "bus bar" for the main power circuit. The red wire on the left brings power to the horn relay from the main splice. The red wire on the right, with the black fusible link, feeds power to the fusebox, through the bulkhead connector. With the exception of things fed directly from the main splice, ALL the electrical power in your car passes through here. This buss bar is also connected internally inside the relay, and supply's power to the relay coil, and to one of the normally open contacts that energize the horn.
The pic below and to the left is a base 68, and has only those 2 wires on the buss bar. The buss bar is also where various optional electrical components are connected.
The other function, of course, is to blow the horns. The relay gets it's power from the buss bar, and is one of the few circuits without a fuse.
The green wire is the other normally open contact. When the relay is energized, power passes to this wire. It connects to the horns, which are grounded to the radiator support to complete the circuit.
The black wire comes from the horn button, and is connected to the second coil lead inside the relay. A ground on this wire will energize the relay, magnetize the coil, close the contacts and blow the horn.
The plastic on the connectors of the green and black wire are keyed so they will only plug into the correct terminal.
The pink w/bk stripe wire is only present on 68-69 models, and is connected to the key buzzer circuit. If the drivers side door is open while the key is in the ignition, this wire will "buzz" the relay.
|The pic on the left is from a 69, a rally sport with optional air conditioning
and factory gauges. The horn relay has additional wires on the buss
bar screw terminals for the ammeter and the Air Conditioning.
The pic below is a 69 with no electrical options, and as perfect a restoration as you will see.
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