plotter turning off!

[Zippy]

we have 2 Garmin 750s units on the rib which are networked to the engine (so the both show the engine data) as well as the depth transducer, AIS receiver and vhf. both plotters can show same data and although the 750s is not strictly "networkable" but everything seems to be working fine!

When out this weekend the plotter on the helm kept switching off. there seemed no pattern to when it would go off but seemed to do it more when it was rougher. (going up and down the river was fine) everything else was no problem. navigators plotter didnt skip a beat. ais was shouting alarms all the time and vhf and Ipod player was going fine.

any ideas,? at first i thought a power feed but this would mean all electrics would go down? fact its always the same plotter makes me think its the unit itself of its direct wiring??

its only started happening after the AIS unit was installed so maybe something disturbed when installing??

thanks in advance!

[jyasaki]

Each unit likely has it's own power feed going back to a master switched buss. I'd suspect the power connection between the main electronics switch and the plotter in question.

If you suspect it's a particular unit (and they're the same) swap the heads onto the installed wiring. If the problem follows a particular unit, you're right: it's likely internal. If the problem stays at a particular station, it's probably wiring. (You can move wiring between heads if that's easier; reverse the results above.)

jky

[Channel Ribs]

J's suggestion seems like the next step to take, if the units are well fixed in then just swapping the plugs over into the back would work.

I suspect the negative to the helm plotter has been loosened.

[Zippy]

Thanks guys.

I am down tonight so will have a play around! So pleased that we went for two plotters now!!!

Apart from this, fantastic weekend!!!

[wavelength]

we had a similar problem on one boat with an inline fuse which kept making and breaking