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Old 04 August 2019, 11:59   #1
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Going round in circles fixing nav light!

Iíve one of the folding pole navigation lights on the transom.
Itís not worked since Iíve owned the boat, so itís raining, so into the garage I went to try and fix it.
Switch was a bit corroded, fixed that.
Checked for 12V at bulb terminal. Good.
Checked other bulb terminal back to battery earth. Beep good.
Bulb in, nothing?
Any ideas?
Does it matter if I am using car bulbs?
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Old 04 August 2019, 12:02   #2
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Check the fitting. Itís probably spring loaded. Even though you are getting 12 volts if the terminals arenít reaching the bulb. Nada.
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Old 04 August 2019, 13:50   #3
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If you've got high resistance in the cable, you'll read 12v on your meter but the bulb won't be able to draw the required current through the cable. Get the bulb online and then check the voltage, if it's low you've got a wiring problem.
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Old 04 August 2019, 13:55   #4
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Does the cable bend where the pole folds? Could be broken internally.
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Old 05 August 2019, 05:08   #5
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Thanks all I think itís a wiring issue and not enough current.
Will have to be put in the to do over winter list.
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Old 05 August 2019, 08:53   #6
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You should be thinking of switching to LED lights too.
https://boatlamps.co.uk

If you're rewiring, opt for tinned cable.
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Old 05 August 2019, 15:13   #7
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Nav Light - Bulbs

Hi Acraw, a painful session that I have endured to only see the error or my ignorance after a few hours of testing. Car bulbs use the outer metal case as a theatre or ground: marine bulbs don't but ONLY use the two solder buttons on the bulb end. Use marine bulbs, in LED if you wish, and problem should solved.
Best wishes Iain
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Old 05 August 2019, 17:39   #8
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Unfortunately small exposed boats are always going to suffer from the elements, for simplicity I changed over to these https://www.railblaza.com/products/navipack/
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Old 06 August 2019, 02:56   #9
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Quote:
Originally Posted by IainK View Post
Hi Acraw, a painful session that I have endured to only see the error or my ignorance after a few hours of testing. Car bulbs use the outer metal case as a theatre or ground: marine bulbs don't but ONLY use the two solder buttons on the bulb end. Use marine bulbs, in LED if you wish, and problem should solved.

Best wishes Iain


Interesting, I wondered that but I am sure the connection is via the outer case, thereís only one spring contact in the middle
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Old 06 August 2019, 03:05   #10
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This isn't a "car vs marine" thing.

It depends on the type of bulb. Some use a center pin with the base as the return others use two pins on the bulb. Double filament (brake/side light) have two pins one for each filament and a return via the base as well.

Can't help but think we're making a mountain out of a mole hill here.

If you were local we could sort this in two minutes.
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