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Posted on Jun 07, 2010
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How to wire a harry moss air horne relay to compressor terminal onrelay are TR BATT PUL AND TERMINAL BELOW PUL WITH NO MARKINGS IT COULD BE EARTH ON THE COMPRESSOR ITS HARRY MOSS MASERATI AIR HORNS TWO SPADE TERMINALS ON TOP NO MARKINGS TOWARDS BOTTOM OFF COMPRESSOR TWO WIRING TERMINALS WITH NUTS ON CAN YOU HELP PLEASE

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  • Posted on Sep 30, 2010
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If the compressor has 3 air connections on top then the two lower terminals with nuts are the + and - supply inputs to the compressor motor. The two top spade terminals power a solenoid valve which changes a triple sequence (illegal?) to a combined blended triple tone. I don't think polarity is an issue but to check this connect a 12V battery -ve to the mounting bracket on the compressor. Attach 2 wires to a headlamp bulb and connect one to battery +ve. Then touch the spare wire to each of the 4 terminals in turn. If the bulb lights that terminal is at compressor ground. You can determine the operation of the relay in the same way. Between 2 terminals the relay will operate. Note those and then test each to the relay bracket to see if one side of the coil is grounded. By powering the relay directly from the battery you can then use the bulb to determine which contacts are 'made' when the relay operates. You will need a relay to control power to the motor. The solenoid valve probably only takes a couple of amps. You could run both the motor and the solenoid valve from the same relay if you just wanted a blended composite tone.

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