14V Accy Plug Not Working

[Txbyker]

The panel accessory plug in my plane is not working.  I have looked at the schematic and the rear of the plug.  There is a single wire which I believe is correct for power as the wiring schematic states it is a frame ground, therefore no ground wire.  Does anyone know if there is a fuse in line or can comment on any other areas to check?  See pics.

 

Thanks,

 

Russ

[takair]

Make sure the case ground is good. If that is the old style "cigar lighter" plug, the. They have an integral thermal fuse that goes bad and you will need to replace it. Check for 14 v at the wire and then the center inside..

[Marauder]

It should be on a breaker (at least mine is). I have seen though a few planes where they were added later and someone put an online basket in the power lead.

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[Txbyker]

Make sure the case ground is good. If that is the old style "cigar lighter" plug, the. They have an integral thermal fuse that goes bad and you will need to replace it. Check for 14 v at the wire and then the center inside..

Thanks, I will.

[Txbyker]

It should be on a breaker (at least mine is). I have seen though a few planes where they were added later and someone put an online basket in the power lead.

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I have a M20R, strangely no fuse on the panel. I did see an inline fuse socket in a wire bundle behind the panel. I bet that might be it.

[Marauder]

It may be protected by the thermal fuse takir mentioned. I would have thought an R would have a breaker. My 75 F does.

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[DrBill]

Mine had a fuse holder under the panel in series with the 12V wire.  In my case it just needed to be cleaned, the fuse was good.

BILL

[carusoam]

The O1 uses 24V at that socket...

Like that one, there are a couple of circuits that are not connected to the master switch...interior lights and that plug... Find the CB for interior lights, you might find the socket connected there as well..?

Don't leave the sky radar plugged in.

Be on the look-out for the step down transformer and what CB it is connected to.

Wondering if that little piece of technology is giving you trouble?

Best regards,

-a-

[Aerodon]

Here are some ideas:

 

1) The 14V adapter is often power via a fuse directly from the battery, maybe even a fuse after a CB

2) There is often a large resistor in 28V planes so that a 14V lighter works - but this does not work with most 14 accessories or converters because the voltage drop across the resistor is not balanced for the load.

3) use converters / adaptors that are rated for 28V, and even then a lot of them make electrical noise, enough to mess up GPS signals

4) newer Cessnas use voltage converters to reduce from 28V to 14V just for the adaptor,

 

Don

[laytonl]

Mine has a fuse at the battery for lights and the outlet. Lee