powerless garmin 740s

[oddysea1]

just purchased a boat with Garmin 740s there is no chip in unit could this be the power issue? it does not turn on/ is there a way to locate power source in plug- there are many terminals I would like to isolate positive and negative to see if it is getting power-any advice would be appreciated- Regards Andy

 

[alldodge]

Paging dingbat , paging dingbat can you come to the front office please

 

[dingbat]

just purchased a boat with Garmin 740s there is no chip in unit could this be the power issue? it does not turn on/ is there a way to locate power source in plug- there are many terminals I would like to isolate positive and negative to see if it is getting power-any advice would be appreciated- Regards Andy

Most, if not all Garmin units come with maps loaded on the drive. The chip reader is for software updates.

There is no docs on the pin out of that connector that I can find. Power is typically pins 1 and 2 but that’s just a guess. Can’t damage anything just probing with the meter.

Having said that, did you check for power at the Distribution panel? Power cord failures are extremely Rare unless physically damaged.

 

[Chris1956]

Some of those units have an inline fuse. I assume you checked that. They can be prone to corrosion.

Your unit should have two cords. One is for power, the other is transducer, if memory serves. The power plug will only have 2 or 3 conductors. It also may have 4 real thin wires for communicating with a HF radio. The Garmin site should have an owners manual. It will have some info on wiring.

 

[Scott Danforth]

you can send the unit into garmin and the can evaluate for a small fee.

 

[Chris1956]

I had a Garmin 730s for years. One day it stopped working and stop being waterproof.

 

[oddysea1]

Thank you- will check connections--- in-line fuse and probe for power source- lots of home made issues on boats .Hoping to find problem if not any recommendations on a good unit for similar price point-Regards Andy

 

[dingbat]

Hoping to find problem if not any recommendations on a good unit for similar price point-Regards Andy

The fuse holder on those units is a know problem area. The first thing I do on new install is to cut the OEM fuse holder and replace with one of my own picking.

That unit it at least 10 years old. What is your "price point"

 

[oddysea1]

1200-1500

 

[dingbat]

1200-1500

Need a fish finder or just chart plotting?

The Garmin echomap UHD 93 or 94 SV is a good unit that comes in under your budget

 

[oddysea1]

Commander Dingbat was correct although holder and fuse looked new it was defective and I replaced it with a new in line fuse holder -the unit now works-I may not have looked at that as a possible issue with out your advice-Thank you

 

[oddysea1]

Same chartplotter with sonar capabitlity -question- no manual- he has transducer in bag with water- in bilge-not sure if this is bilge water or intentional-does the transducer require water to function without a thru hull cut in bottom