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cfi(at)conwaycorp.net
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 Posted: Mon Mar 31, 2008 4:08 pm Post subject: KLN90B Lighting |
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I’m working on the wiring harness for my KLN90B GPS. The instructions for the lighting circuits are not 100% clear to me. There are three pins for a 14V install: two for “Lighting Bus Low” (pins 28 and 32) and one “14 V DC Panel Lighting Bus"/HI (pin 29) (figures 2-1 and 2-17 from the installation manual are attached). Where should these be sourced? More specifically, what is a “LO” source? Is the “14 V DC Panel Lighting Bus” the dimmer switch? …or am I wrong on both counts? Is there something else that I’m missing? This will be a VFR installation.
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Thanks,
Michael H.
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KLN90B_fig_2-17.pdf |
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iredgar(at)gmail.com
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| Posted: Mon Mar 31, 2008 5:13 pm Post subject: KLN90B Lighting |
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Michael,
I suspect the LO connections are just panel lighting grounds and HI is
supply voltage for your panel lighting. There may be other opinions on this
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nuckolls.bob(at)cox.net
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| Posted: Mon Mar 31, 2008 5:48 pm Post subject: KLN90B Lighting |
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At 07:01 PM 3/31/2008 -0500, you wrote:
| Quote: | I’m working on the wiring harness for my KLN90B GPS. The instructions for
the lighting circuits are not 100% clear to me. There are three pins for
a 14V install: two for “Lighting Bus Low” (pins 28 and 32) and one “14 V
DC Panel Lighting Bus"/HI (pin 29) (figures 2-1 and 2-17 from the
installation manual are attached). Where should these be sourced? More
specifically, what is a “LO” source? Is the “14 V DC Panel Lighting Bus”
the dimmer switch? …or am I wrong on both counts? Is there something
else that I’m missing? This will be a VFR installation.'
|
There are two strings of 14v lights in series. The
14V wiring grounds the top end of the 28V string
and drives the center with the two ends in parallel.
For 28V, the 14V center tap is left open and one
of the 14V "lo" connections becomes the 28V
lighting load.
Bob . . .
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gfr56(at)comcast.net
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| Posted: Mon Mar 31, 2008 6:13 pm Post subject: KLN90B Lighting |
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An avionics guy explained to that Low is another word for ground. My icom and ps engineering audio panel used the same terms and that is how I wired them.
Jerry
[quote] ---
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mlas(at)cox.net
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| Posted: Tue Apr 01, 2008 7:22 am Post subject: KLN90B Lighting |
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Ian,
Your are correct!
Mike
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mlas(at)cox.net
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| Posted: Tue Apr 01, 2008 7:23 am Post subject: KLN90B Lighting |
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Bob,
No offence, but based on the writing of the original post, I think your
reply will be considered more confusing then the King notes on the
drawing. Just having a little fun!
Mike
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mlas(at)cox.net
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| Posted: Tue Apr 01, 2008 7:27 am Post subject: KLN90B Lighting |
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Jerry,
Also correct. 14v = Positive (HI) pin 29. Bus ground (LO) pin 28 & 32.
28v = Positive (Hi) pin 28. Bus ground (LO) pin 32
Mike
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