Electrical Wiring

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BWhaler1

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I have a new Garmin 740s, I removed the old GPS and hooked the red/red and black/black turned the batt's on and the unit does not turn on, all the other electronics come on when the batt is turned on. It's probably something simple, but I don't see it! Any thoughts?
 
perhaps the fuse blew when you were working on the wires.
 
quote:
Originally posted by BWhaler1

I have a new Garmin 740s, I removed the old GPS and hooked the red/red and black/black turned the batt's on and the unit does not turn on, all the other electronics come on when the batt is turned on. It's probably something simple, but I don't see it! Any thoughts?

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A couple thoughts.

First, the 740S takes an extra long hold of the power button to turn on - something like 7-10 seconds long. How long did you hold the button?

Second, if that is not it, get some alligator clips and wire it directly to the battery, and see if it turns on. This will eliminate supply vs demand issue.

If it turns on, directly wired, start chasing the wiring. My experiences have told me that usually there is a bad ground along the way.
 
Check the connection, while rare maybe the wire insulation is preventing good contact. Check for power at the wire to see if it s the unit or power
 
If there is a 7 second delay I would bet that's the issue!
 
7 seconds sounds ridiculously long... The worst I ve seen is on some Ray mfd where to power off you have to hold for close to 10 seconds as the system first offers other adjustment like brightness...
 
Actually I don't understand why there would be a power ON delay. Power OFF makes sense in case you hit the wrong key underway but not ON
 
I can attest that there is indeed a power on delay. At least 4-5 seconds
 
There are a number of units I've used with a power on delay. But never one with 7-10 seconds.
 
The power up delay is the devices boot loader, it takes time 3-4 seconds total.
Make sure you read the owners manual I vaugly remember having to set the unit for auto power up when 12VDC is applied. I might be thinking about my 6212 or 4212 Garmin plotters.
I find splicing into the old plotters wires is never a good idea you introduce 2 additional points of failure and the old wire could be undersized or have internal corrosion.
Look at the bottom of page 48 of the owners manual, I included a PDF copy below.
http://www8.garmin.com/manuals/GPSMAP720_OwnersManual.pdf
Select Configure, then System then Auto Power then select "On".
I was correct it must be set up to power on automatically.
Bill
 
The best way to test an electronic or electrical device (we're talking 12 volt DC here) is to connect it directly to a fully charged 12 volt battery. It doesn't have to be the one in the boat, often your car or truck battery is more convenient.

Doing this bypasses all the boat wiring, fuses, circuit breakers, switches, etc.

If it works connected directly to a battery, there is a problem with the installation or the boat's wiring.

If it doesn't work, it's defective and you save yourself a lot of trouble trying to find a non-existant problem on the boat.

And yes, on some of these more modern electronic devices, you can't just "hit" the power button, you have to press it and hold it for a second or so. It's not just a switch like the light switches in your home, it's starting an electronic power on proceedure.
 
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