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On/Off switch for Garmin radar dome?

Old 08-14-2011, 07:02 AM
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Default On/Off switch for Garmin radar dome?

Hi all,
I just bought a Garmin 24HD radar dome to add to my Garmin 4212 chartplotter. I noticed that there is no mention of wiring an on/off switch into the power cable for the antenna. Does the 4212 control the power to the antenna via a relay (or some other electrical device built into the radar)? I don't want the antenna powered up every time that I have power to the helm, since I use the anchor watch feature when overnighting and don't plan on using the radar then.
Thanks.
Old 08-14-2011, 07:35 AM
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Yes, the radar is controlled through the 4212 via internal circuitry. The power supply that gives the radar its main source can be switched if you wish but be sure you use a switch rated for the load.
Old 08-14-2011, 10:02 AM
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Originally Posted by hatterbee View Post
Yes, the radar is controlled through the 4212 via internal circuitry.
Thanks. That's what I was hoping. Just wanted to make sure I wasn't overlooking something.
Old 08-15-2011, 06:37 AM
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I wired my 18HD thru a switch on the 4208. With the switch in the off position the MFD doesn't recognize a dome is attached to the system. Flip the switch to on and the icon becomes available to use the radar.
Old 08-15-2011, 06:55 AM
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I have mine switched, which turns out to be a good thing. Not only can I keep it completely powered down at the dock (standby mode is not powered down), I can reset it when I get the dreaded "Radar Lost" message.
Old 08-15-2011, 04:11 PM
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Sounds like there are no cons to wiring in a switch. Thanks all.
Old 08-18-2011, 07:31 AM
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I am purchasing an 18HD can someone tell me what the load requirement is for the dome unit? Thanks guys! This was a very helpful thread as I plan my install.
Old 08-18-2011, 09:07 AM
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The 18HD's power input source is listed as 10.5 - 35 VDC, 33.5 watts. With a 12 volt system it will draw around 3 amps.
Old 08-19-2011, 07:29 AM
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Don't have dome yet. Is there a power wire for the dome? I have been told it get power threw the display? I have a hard time beliving that, Domes and ray usally need more power than the display. Is this true?
Old 08-19-2011, 11:48 AM
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The dome has 2 cables. A power cable and a data cable.

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