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Name: |
Lifer
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Subject: |
A mystery
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Date:
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8/25/2018 1:55:24 PM
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I have a light issue on the boat. My port light is inoperable. I replaced the bulb and it didn't work so got the multi-meter out and checked the fixture. It has 12volts going to the posts that contact the bulb. So I thought maybe it was just a factory defective bulb. I took the bulb out of the starboard side that was working fine and put it in the port fixture. Nothing. I placed the new bulb in the starboard side and it works fine. One other curiosity is once the bulb is in place there is no longer current to the posts. I swapped them back again to check if the fixture had shorted and blown the bulb. Both bulbs work fine in the starboard fixture. Baffling to my limited brain capacity!
I realize of course the simple fix is just buy new fixtures and I plan to do so ASAP but I am just curious as to why/how this could be happening. Anybody have any ideas?
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Name: |
wix
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Subject: |
A mystery
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Date:
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8/25/2018 5:43:32 PM
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Sounds to me like corrosion in the socket or where the wire contact socket. I keep a tube of electrical contact grease close at hand for such failures.
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Name: |
Lifer
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Subject: |
A mystery
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Date:
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8/25/2018 6:57:31 PM
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There was bit of corrosion but I took sand paper and cleaned all contact surfaces. I forgot to mention that.
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Name: |
oneshot
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Subject: |
A mystery
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Date:
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8/25/2018 8:40:40 PM
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Lifer, if your fixtures are seperate, trace the ground wire back on the defective one. Sounds like a defective ground.
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Name: |
Lifer
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Subject: |
A mystery
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Date:
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8/25/2018 9:11:45 PM
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Thanks but just replacing the fixtures is easier. The wires are all in protective sheathing and I am color blind so tracing wires is not an easy task for me.
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Name: |
MrHodja
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Subject: |
A mystery
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Date:
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8/25/2018 11:22:51 PM
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Without reading any of the other responses I will recount an instance at the house I used to live in. Dishwasher wouldn't work. Meter read 120 volts. Answer was a corroded contact between the breaker and service panel. A meter would read 110 from the little good contact there was but the corrosion kept the current from being adequate to run the dishwasher. Maybe something similar?
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Name: |
Shortbus
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Subject: |
No mystery
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Date:
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8/26/2018 3:33:05 AM
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No mystery.... Hodja is right. If volts read in the socket, but a good bulb on clean contacts doesn't work - high resistance in the circuit.
Check all connections and splices.
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Name: |
architect
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Subject: |
No mystery
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Date:
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8/26/2018 5:40:27 PM
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Try the high tech approach...spit on the bulb base and into the socket! It's worked for me more than once.
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