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Master relay

in General Tech Discussion 12 years ago
All, my master relay only delivers 9,4V output (13V input): what can I do!?
Any reaction highly appreciated....

  • Re: Master relay

    by » 12 years ago

    The relay probably has high resistance contacts from arcing internally.
    It is "fried". Replace it. They cost less than $25.00.

    David
    Thank you said by: Hans Labruyere
      
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  • Re: Master relay

    by » 12 years ago

    Thanks for your quick answer. I couldn't find the relay on http://www.ultralightnews.ca/rotax912/ - can i use any relay in his matter?
      
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  • Re: Master relay

    by » 12 years ago

    I do not know what type of airplane you fly, nor where the relay is. In many light aircraft the main battery relay is located next to the battery and is controlled with a "master" switch. This relay is not a Rotax part, but rather one that was put in by the airframe builder. The ones I've seen are plain automotive or marine, four post, 12 volt, continuous duty. They draw less than 1 amp, and have an isolated coil of about 80 ohms, so you can have the ground side of the coil go to the master switch. A typical one is: Cole Hersee 24059-BP continuous duty solenoid.

    David
      
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  • Re: Master relay

    by » 12 years ago

    Any automotive type 12V relay will work. I use a cole hersee like david mentioned. They make them in many different weights and sizes and both intermittant and continuous duty types. Either type will work for starting.

    Bill.
      
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  • Re: Master relay

    by » 12 years ago

    Hans,

    I may have misspoken. I assumed it was the starter solenoid relay, which can be the intermittant or continuous
    duty type. The master switch relay must be a continuous duty rated relay.

    I don't have a relay in my master circuit, Just a 50A switch. Hence my confusion.

    Bill.
      
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