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

I can't remember correct setup but make sure that box is powered and connected to GPS in right input. With no power to box it won't be discovered by head unit.

Bad connection or a fault to the unit.

Do you have it on a separate battery? It is best if they are, or connect direct to the starting battery, not connected via power that you find in the console or on a power bar.

Make sure you are using good quality copper stranded wire of the correct gauge with soldered or properly crimped connectors. I think it is 18 gauge, but your installation instructions will guide you. Also mentions 24 AWG. Manual states;

Wiring
There are two wiring diagrams provided for you convenience. The first is a simple hook-up showing the GPSMAP 2006/2010 (using the 18-
pin wiring harness), the GPS 17 and the alarm circuit. The Alarm does not have to be wired for the unit to function. The second is a complete
wiring diagram showing the GPSMAP 2006/2010 (using the 18-pin wiring harness) interfacing with a variety of different equipment. The extra
5-pin wiring harness that came with the unit is intended for future interfacing features and does not require connection. Refer to the wiring
diagram that will best suite your needs. Make sure that all connections are good. For extra lengths of wire, 24
AWG (unless otherwise noted on
wiring diagram), shielded, twisted-pair wiring is recommended. We advise soldering all connections and sealing the connection with heat shrink
tubing. If you experience difficulty wiring the unit, please contact an installation professional in your area.

Make sure the connections are good on the rear of the unit including plugs to the transducer. You can coat with a little Vaseline which his electrically conductive.

States the unit is susceptible to RFI and should be 3 feet away from a radio antennae.

Finally, make sure the inline fuse and connections to it are good.

If all that seems good, the first thing to do is swap out the transducer for a new one. Still does it? Send the unit for repair.

Does it also do it at rest in the marina, or do you trailer the boat?

I have a Humminbird 998 HD Si.

http://static.garmin.com/pumac/47_2006_2010_GPS17Installation.pdf

Hi Bill:
Working from logic only, the reason a fuse blows is that it is getting excessive current. If the fuse blows when the motor is turned off, it would seem possible that the switch is not functioning properly.
I would try to isolate the switch and check it with a continuity meter to see if it is defective.

Follow instructions for wiring up speakers. If you don't have instructions https://soundcertified.com/speaker-wiring-diagram-guide should help Now, turn off the radio Double check your power source and wiring to find a short from the battery to the radio. Turn on the radio to see if it is now ok. I am almost 100% sure you have a short somewhere between your battery and radio. Make sure you have the pos. and neg.wires in the right place.

Hello,

You may want to contact Garmin Support for assistance.
1-800-800-1020

Hello
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.

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Please dont forget to vote this answer was helpful.

Many thanks

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Did you buy this new? sounds like the wrong fuse or there is a short somewhere. I'd check with garmin as they have a good customer service. good luck.

Hello there:
they do use some of the battery if it is wired into somthing that feeds directly off the battery i would recomend getting a battery disconnect switch this way when you turn off the switch the whole electrical system will be disabled. go to www.westmarine.com they have them listed on their website even though they might not be local you can get a idea of what you are going to be looking for ok?
best regards mike

My husband moved the boat slightly and it seemed to correct the radar screen somewhat. He is working on the whole boat at present so didn't want to take it completely for a drive down the river. If we have further problems we may call in or use the web site.

Thanks,

Farrar

Hi,

This is a known issue and to my knowledge there was even a recall order to correct this fault. It would seem the the wiring harness itself is the reason. You may want to reference these pages here and/or here.

Should you however prefer to perform a DIY, then you would need a DVM to check for voltages. This page shows the possible wiring scheme used by most manufacturers for trailer configuration.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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