NASA AIS Engine 3 Power Supply

[Dazzajohm]

Good evening,

I've had an AIS Engine 3 tucked away in my garage I found in a locker of my previous boat. As my recent purcahse doesn't have AIS on I thought I'd dig it out and see about connecting it up to my plotter. I'm pretty much there with knowing where all the NMEA wires go thanks to another post on here but I'm a little baffled by the power supply.

Hopefully a picture is attached and you will see it was obviously previously powered by a 3 pin 240v 12v transformer plug. Not quite sure why it would have been used with a 3 pin plug but nevermind...

When I install this, I'll just want to connect it to a 12v supply and was thinking of just cutting the 3 pin plug off the end and connecting up but then how will I know which is + & -?

Any ideas?

Cheers
D

 

[RichardS]

Good evening,

I've had an AIS Engine 3 tucked away in my garage I found in a locker of my previous boat. As my recent purcahse doesn't have AIS on I thought I'd dig it out and see about connecting it up to my plotter. I'm pretty much there with knowing where all the NMEA wires go thanks to another post on here but I'm a little baffled by the power supply.

Hopefully a picture is attached and you will see it was obviously previously powered by a 3 pin 240v 12v transformer plug. Not quite sure why it would have been used with a 3 pin plug but nevermind...

When I install this, I'll just want to connect it to a 12v supply and was thinking of just cutting the 3 pin plug off the end and connecting up but then how will I know which is + & -?

Any ideas?

CheersView attachment 73783
D

That seems strange to have a mains brick on an AIS unit.

The earth pin is just a blank to open the socket Anyway, convention is that the centre pin on the socket is +ve but you could always plug in the block and test the output with a multimeter to check that the centre pin is indeed +ve.

Richard

 

[Dazzajohm]

That seems strange to have a mains brick on an AIS unit.

The earth pin is just a blank to open the socket Anyway, convention is that the centre pin on the socket is +ve but you could always plug in the block and test the output with a multimeter to check that the centre pin is indeed +ve.

Richard

Yep I wouldn't imagine there is an earth connected, but if i cut the plug off so I've just got two wires, how will I know which one to connect to the 12v positive and which one to the 12v negative?

 

[Daverw]

Check with a meter which of the connection pins is +v then chop the lead and test for zero resistance and then you will know which is which

 

[LadyInBed]

It's using a universal-ac-dc-power-supply
The end is marked to indicate a + or - tip