Question about Garmin GPSMAP 198C GPS Receiver

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No power Garmin 198c will not turn on. Wiring on boat and all fuses seem fine. Before it would not power on at all it would go off for no reason and I would have to turn back on. Any suggestions? thanks

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Re: No power

Could be worth a look at the connector on the back of the unit itself. As I discovered a few weeks back, they aren't as saltwater resistant as the IP67 rating would lead you to expect. Compare the pins in the plug with the diagram on page 99 of your manual (also downloadable from and make sure all the pins that are supposed to be there actually are. In particular, make sure pin 15 is in a decent state. This one carries power to the unit, but will act as a sacrificial anode in the presence of saltwater, and can rapidly corrode to oblivion. If this is what has happened, you have a bit of a problem, because Garmin, don't appear to be very good at making spares available. I was lucky in that the GPS I was fixing was a lower end model that only used five of the seven pins in its connector, so I was able to rewire to provide a supply through the unused pins. The diagram suggests that the 198C also sports a few unused pins, so you may well be in luck. A.

Posted on Apr 14, 2007

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Problema com luz do lcd

if your light is not working i think you will have to send it back to garmin or a service agent in your country as this is the best way of getting it repaired.


Please dont forget to vote this answer was helpful.

Many thanks


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Power problem

If you have the unit plugged into a cigar lighter adaptor socket, then first check if the socket is working using another device. Then unscrew the und of the plug and the small silver tip in the centre will come out. This holds a fuse which may have blown. replace it even if you think it looks ok unless you know how to test it.(My bet is that this is the problem)- check at the end of this solution for a link that explains how to change the fuse. If the unit was hard-wired to the car power, then somewhere between the car battery and the unit should have been a fuse, possibly although unlikely more than one. Check this, it would normally be close to the unit, but it may be under the hood somewhere, possibly an in-line fuse holder (usually looks a bit like a short fat fountain pen, with a way to twist the two halves to release) - if the wiring is new compared to the car, hopefully it will be easy enough to follow. It is also possible that there were spare fuse slots in your car fuse panel, and one of these may have been comandeered for your gps, check they are all ok - usually you can see this visually. There is a small possibility that the battery/charging system of the car is not in perfect working order. There may be enough voltage for the car to start and run normally, but an item like a gps can be much more sensitive to slightly low voltages. If you can use a multimeter then this should be easy enough to check yourself (ask again if you need help with this), otherwise any auto-shop should be able to check it very quickly (2 minute job) and check the voltage available at the GPS. If the unit became excessively warm from sunlight etc. then there is the possibility that the internal battery has failed - contact garmin and they will advise you how to get a replacement - probably you have to send the unit to them. If none of this helps or sheds any light on the problem, this link has the manual etc. for your gps if you need it; also there are contact details for garmin - the warranty is still valid so long as the unit was installed properly, and garmin are usually very helpful. Page 31 of the user manual shows how to change the power fuse if you are having trouble. Hope this helps:)

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