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Thread: Wiring Glitch

  1. #1
    Registered User Craig's Avatar
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    Unhappy Wiring Glitch

    Hey guys -

    As I mentioned in another post to Jake, I have a wiring problem in my Duce that is really nagging at me.

    I installed the radio (MicroAir 760) per their wiring diagram. When I press the PTT, I get a loud squeal in the headphones, and the tach needle goes to the top of the scale.

    Power for the tach comes from a main power bus, input from the mag switch - power for the radio thru the avionics bus.

    I re-wired the jacks with shielded wires, as they are on the left of the panel, and the radio is on the right. Still squeals.

    I disconnected the switch that operates radio or intercom - still squeals.

    Any hints, tips, or whatever would be really appreciated!

    Craig
    Craig
    Bakeng Duce NX96CW
    Jupiter, FL

  2. #2
    Super Moderator Midniteoyl's Avatar
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    You using a common ground bus for the two power busses? Might wanna seperate them.

    Jim
    Jim

    ------------------------------------------------
    Express 2000FT (hopeful - Again)

  3. #3
    Registered User Craig's Avatar
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    Grounded

    Nope - separate grounds all around! Of course, all the grounds DO terminate at the same battery! Actually, the grounds are on different sides of the cockpit - four in all.
    Last night I fooled around again, this time getting a rapid 'tic' in the earphones, and the tach didn't jump as much.
    Also got my front cockpit door installed, and the flap hinges cotter-keyed, so the evening wasn't a total waste.
    Don't you just love exasperating little problems?

    Craig
    Craig
    Bakeng Duce NX96CW
    Jupiter, FL

  4. #4
    Super Moderator Midniteoyl's Avatar
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    this time getting a rapid 'tic' in the earphones

    Hmm... check out your Coil and Spark plug wires. Just saw a guy with a squeal/rapid tick on his radio that turned out to be a bad Spark Plug wire (termination at the plug was bad). This would appear to be the same.

    Jim
    Jim

    ------------------------------------------------
    Express 2000FT (hopeful - Again)

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