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ContinuousWave: Small Boat Electrical
Garmin GPSmap 276C Dead after Winter layup
|Author||Topic: Garmin GPSmap 276C Dead after Winter layup|
posted 05-29-2007 01:38 PM ET (US)
I just put my Montauk in the water today for the season (yea!). My Garmin 276C has sort-of died over the Winter. If I press the power button I get a beep but then nothing happens. It must be getting power if it beeps (same behavior with battery pack removed). Cables and connections all look good. Any ideas before I call Garmin?
posted 05-29-2007 02:40 PM ET (US)
Connect a voltmeter to the positive and negative power leads to the GPS and observe the reading when you attempt to power up the unit. You may have a corroded connection that is providing voltage under no-load, but insufficient voltage/current under actual load due to high resistance.
posted 05-30-2007 12:48 PM ET (US)
Voltages are normal.
posted 05-30-2007 01:29 PM ET (US)
Any corrosion in the male or female quick connect at the rear of the unit? If not, and you've confirmed supply voltage/ground is nominal under load... then give Garmin support a call.
posted 05-30-2007 03:37 PM ET (US)
Garmin has no idea, but wants a $200 flat-rate repair fee. What a racket. Time for a new unit.
posted 05-30-2007 04:24 PM ET (US)
$200? That's kind of high, but maybe you get all new innards and LCD for that price. The 276C is still a $500 unit today, so if you can get the working parts replaced for $200 with a new guarantee- it may be worth it.
posted 05-30-2007 04:58 PM ET (US)
If you like that unit then send it on to Garmin. I did the same with an older unit and mine was returned with a brand new unit. I was very happy with their service.
posted 05-31-2007 10:52 AM ET (US)
I had a strange problem with my Garmin 198C last year. It appeared to power up, beeped, but no display. I finally discovered that I had accidentally set the display brightness to nil. I believe if you press the power button briefly while the unit is on, the up/down arrows adjust brightness...check your manual for better specifics. You might want to try this before mailing it off.
posted 05-31-2007 02:24 PM ET (US)
That was one of the things Garmin had me try - no soap.
posted 06-01-2007 03:03 AM ET (US)
Is there a way to reload the operating system software to the Garmin unit? It could be corrupted.
posted 06-01-2007 07:26 AM ET (US)
I have had the same thing happen with a fish finder. Wouldn't turn on but voltage was correct at plug. Turned out to be a corroded fuse holder.
Lesson learned: clean and check all the contacts at the battery and any joints/splices/fuse holders etc. in the power circuit for the Garmin. As WhalerBob said, just because the proper voltage appears at the plug does not mean that it will work. When you check voltage with a volt meter, there is no load so voltage will appear normal with essentially zero current, however a corroded joint will not allow sufficient current to pass through to the GPS to power it (much like a kinked garden hose won't allow sufficient water flow through the part of the hose down stream of the kink). I'll bet you have a corroded connection somewhere in the circuit.
posted 06-01-2007 08:05 AM ET (US)
The software can be reloaded into the Garmin but you need to
get it booted up first. Garmin may have an internal way to
reflash the system, but it won't be accesible to the rest of
I'd charge up the battery pack for a couple of days and see
Where was the unit stored over-winter?
posted 06-01-2007 03:24 PM ET (US)
I don't see or measure anything wrong with the electrical supply and/or associated wiring & connectors.
It was stored on the boat. Was that a mistake?
posted 06-01-2007 06:32 PM ET (US)
Attach the power (with a fuse) and ground leads of the GPS wiring harness directly to a different battery to rule out the wiring.
posted 06-01-2007 07:51 PM ET (US)
Most electronics will tolerate winter storage but anything with an LCD display should not be subject to long periods of extreme cold. Precipitates can form in the LCD fluid which are not reversible. This would be mainly cosmetic and does not sound like your problem.
posted 06-02-2007 12:40 AM ET (US)
From looking at the manual, it looks like the 276C came with
a 110V power adaptor. Try charging the batteries with that.
If it doesn't work in 30 minutes, let it charge overnight.
If that doesn't work, find a bud with the same unit and try
If that doesn't work, and you like the unit, send it to
posted 06-02-2007 07:46 AM ET (US)
It behaves the same connected to boat power or not (internal battery power). Beeps when you hit the power button. Wouldn't this rule out the power wiring?
posted 06-02-2007 08:24 AM ET (US)
It's possible that the internal battery got deeply
self-discharged over the winter, so a thorough charge with
a different charger and then trying a different battery
eliminates both that possibility and the possibility of a
This is a relatively low probability of being the problem
You might also as on sci.geo.satellite-nav (you can get there
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