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Old 05-26-2020, 08:07 PM   #1
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Default Instrument light issue

Hi all,
I have a 2000 2WD double cab diesel turbo D22 Navara.
The light bulb that illuminated the heater controls in the dash keeps blowing for no reason (obviously there is a reason...)

I can fit a new bulb and it works then blows soon after.

Is there a common issue that causes this?

Just asking before I start ripping into it all.
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Old 05-26-2020, 09:30 PM   #2
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Sounds like there would be a short probably on the ground side. Just speculating based on the bulb blowing and not a fuse.
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Old 05-28-2020, 12:37 PM   #3
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Quote:
Originally Posted by MidnightSun View Post
Sounds like there would be a short probably on the ground side. Just speculating based on the bulb blowing and not a fuse.

I don't agree with above. Bulbs are always wired directly to ground.


I'd check my charging voltage; attach DC voltmeter across battery terminals and run engine at about 3500 rpm, and read voltage. If over about 14.5 volts, then bad alternator/regulator.


Had similar happen in an old Toyota, all bulbs burned out except headlights and stop lights: bad alternator.
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Old 05-28-2020, 04:18 PM   #4
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+1 on checking the alternator. Also, use a multimeter to test the socket for the bulb itself to make sure it's getting the right voltage. If the alternator seems to be ok but the voltage at the bulb is doing weird things, you'll have to get the wiring diagram out and see what the possible points of failure are.
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Old 05-29-2020, 12:08 PM   #5
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Even though absolutely everything else is working perfectly
That is the only bulb that blows.
I’m picking there is an issue with that particular circuit.
Chaffed wire etc....
I’ll take a look on days off after shift work and report back.
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Old 05-29-2020, 12:39 PM   #6
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Quote:
Originally Posted by MacGyver View Post
Even though absolutely everything else is working perfectly
That is the only bulb that blows.
Iím picking there is an issue with that particular circuit.
Chaffed wire etc....
Iíll take a look on days off after shift work and report back.

So you've already decided the cause without running the simple test in Post #3???
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Old 05-29-2020, 03:33 PM   #7
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Not necessarily decided, just thrashing out options.
I’ll report back once I’ve had a poke around.
It’s only one bulb, would have thought a faulty alternator output would effect more than one bulb...
Worth checking out though, never know....
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