NASA Supernova Combi Masthead LED Nav Light - Wiring Diagram Please.

[STATUE]

I have one of these and posted a thread about it a week ago and was advised to check connections, as mine was not working.

I have disconnected the lower mast end connection and serviced the plug - but no joy.

Has anyone a wiring diagram?

I do have a schematic of a DPDT switch.

What I need to know is how I check from the switch to the connector down at deck level to at least know that section is working before going up the mast.

In anticipation - Many thanks.

 

[Bru]

Voltmeter on the deck connector

With the switch one way you'll have +12v, with it the other way -12v (the masthead unit switches between anchor and tricolour depending on the polarity of the supply)

 

[VicS]

I have one of these and posted a thread about it a week ago and was advised to check connections, as mine was not working.

I have disconnected the lower mast end connection and serviced the plug - but no joy.

Has anyone a wiring diagram?

I do have a schematic of a DPDT switch.

What I need to know is how I check from the switch to the connector down at deck level to at least know that section is working before going up the mast.

In anticipation - Many thanks.

What Bru says ... but be aware that if you are using a digital multimeter they take so little current that they will often given normal readings even when there is a poor connection in the circuit.

I would connect a small 12 volt bulb in parallel with the meter just to provide load that will draw some current

The wiring diagram is in the fitting instructions see .. https://seamarknunn.com/acatalog/2048274.pdf

 

[yachtorion]

I think I remember testing mine with a smoke alarm battery - connect the wires one way around for tri, then the other for anchor! It won't be full brightness but enough to test the unit itself once you get up the mast. You could also try this by connecting the smoke alarm battery to the cables coming out of the mast but if it gets hot remove it quickly!

For testing things at ground level, there should be two cores going up the mast, put a multimeter on them in voltage mode, you should see ~ 12v on one setting and when you reverse the switch you should see ~ -12v.

If that works, disconnect the power cables from the switch into the boat system, join the positive and negative together (with the battery master switch off just in case) then use the meter to measure the resistance on the cable to the mast with the switch in each on position. You shouldn't see more than a few ohms resistance.

 

[STATUE]

What Bru says ... but be aware that if you are using a digital multimeter they take so little current that they will often given normal readings even when there is a poor connection in the circuit.

I would connect a small 12 volt bulb in parallel with the meter just to provide load that will draw some current

The wiring diagram is in the fitting instructions see .. https://seamarknunn.com/acatalog/2048274.pdf

Thank you VicS and everyone - there's always an answer out there some where and you three did it.

Thanks again.

 

[jbweston]

What Bru says ... but be aware that if you are using a digital multimeter they take so little current that they will often given normal readings even when there is a poor connection in the circuit.

I would connect a small 12 volt bulb in parallel with the meter just to provide load that will draw some current

. . .

I echo that. Years ago I had trouble with my nav lights. Meter showed decent voltage at fitting. It took me a while to realise that the feed wire had corroded inside the insulation to the point where it was connected by a thread. Result - good voltage when no load, but feed useless when the nav light was connected.

Once I knew this, it all made sense.