Basically, the way the horn sitiation works is a constant hot thru the key switch, the ground will be derived thru the 2 temp sensors and any of the VRO system. If any of them trip it sends the ground path from the motor block to the horn.
You may disconnect the VRO and not interupt the water temp portion and visa versa.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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