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Old 08-16-2022, 11:19 AM   #1
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low voltage reading to dc lights

Why would my meter read 1.5 volts on the wires going to a 12 volt light? What would cause this and where do I begin to troubleshoot. Thanks
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Old 08-16-2022, 11:23 AM   #2
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Are the lights really dim, or is it just the meter reading low? Is the meter set on a 10X range?
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Old 08-16-2022, 11:36 AM   #3
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Is the switch on or off? Is the bulb in or out of the fixture? Have you tried you're probe on a different ground path?
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Old 08-16-2022, 01:54 PM   #4
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bad ground
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Old 08-16-2022, 02:05 PM   #5
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Single light , or a series of lights?

Doubtful that one light would have it's own fuse , so bad connection at a splice or connector on the power side .
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Old 08-16-2022, 02:09 PM   #6
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Let's start with your house battery.

What voltage does it read when you are unplugged from shore power?
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Old 08-16-2022, 03:45 PM   #7
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Let's start with your house battery.

What voltage does it read when you are unplugged from shore power?

all the other dc lights, fans etc work fine its just the two in the garage. I am connecting my probes directly on the two wires that connect the light. I have disconnected that light altogether. I have two lights in the garage and only one worked, they are the lights that come on when they sense motion. Now they both quit.
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Old 08-16-2022, 06:13 PM   #8
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Old Biscuit said bad ground. I vote with him.
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Old 08-17-2022, 08:42 AM   #9
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Good advice posted above.

Blown fuse (some fuse panels have blown fuse indicator the would supply low voltage to light)
Loose or corroded connector (Grounds are frequent culprits)
Defective switch (if both lights are on the same switch, that would be a good place to start)
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Old 08-18-2022, 07:04 AM   #10
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Good advice posted above.

Blown fuse (some fuse panels have blown fuse indicator the would supply low voltage to light)
Loose or corroded connector (Grounds are frequent culprits)
Defective switch (if both lights are on the same switch, that would be a good place to start)

It was a blown fuse. I didn't think I would have any voltage with a blown fuse but tells you what I know.
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Old 08-18-2022, 11:39 AM   #11
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I didn't think I would have any voltage with a blown fuse
The voltage you're likely reading is leakage, not necessarily across the open fuse but any number of other paths of extremely high resistance or through some other device that may be connected to this circuit that has power. Digital meters are typically very sensitive and can measure voltages through very high resistances. Sometimes using a "dumb" test/continuity light eliminates some of the stray voltage measurements you'd get with a meter.

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