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Old 02-05-2019, 05:08 PM   #1
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Hi temp light on?

Hi y'all, so I just changed out the bulbs in the back of my dash cluster with green LEDs. Now, when I turn on the ignition, this is kind of lit up. A couple lights pop on and off real quick and are much brighter. Any thoughts on why this is happening?

I'll take some pics when it's darker outsideIMG_6227.jpegIMG_6226.jpeg
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Old 02-05-2019, 07:13 PM   #2
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If the dash illumination bulb is close to the warning bulb, the brighter LED might be bleeding through showing an outline of the temp light? Does it look like this with the marker lamps off?
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Old 02-05-2019, 07:27 PM   #3
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Here is some new get shots. One with flash, one without.

IMG_20190205_202518.jpegIMG_20190205_202659.jpeg
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Old 02-05-2019, 07:30 PM   #4
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As I understand it from some Google Fu, the light should light up when the ignition is switched on or motor started to show that the bulb works. Maybe it's showing that the temp gauge itself is broken? I'll have to track that down.

The bottom row of lights was previously covered and the top three from right were also covered. This bus's electronics has been chopped here and there from it's long camp bus life so who knows. I'm not sure if any of the warning systems actually work lol.
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Old 02-05-2019, 07:37 PM   #5
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It is possible I removed the blower switch/relay for the extra radiator fan (excuse my layman's terms). However, I might not if either. I dunno. I do have the fan wires to manual switch at this point
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Old 02-05-2019, 07:38 PM   #6
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This thing here looks familiar. Guess I need to trace some wires?Screenshot_20190205-203557.jpeg
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Old 02-05-2019, 08:18 PM   #7
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I had something similar when I replaced all my warning lights' incandescent lamps with LEDs. The warning light for the Jake Brake would then faintly illuminate even when the Jake wasn't working; it shone brightly when the Jake was on, but I don't like to see false indications all the time. I think it was something to do with LEDs' much lower current draw - the Jake light is powered directly from the ECM, so who knows if the ECM was being fooled by the LED.

This was one of several reasons I've now gone back to using good ol' incandescent lamps for all my gauges (except those with their own internal illumination such as Speedhut) and all my indicator lights. It just annoyed me to see TARD in bright blue whenever I had the RETARDER (the Jake Brake) on . . .

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Old 02-06-2019, 06:28 AM   #8
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Some of the light circuits use the bulb as part odf the circuit.. an LED is still a Diode which is an electronic component that blocks power going one way.. its possible the circuits are designed that the resistance of the bulb played into the ciruit..



it also may be as others mentioned that the illuminator around the gauge is showing through... I wouldnt think you changed your temp warning light to a green LED??
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Old 02-06-2019, 06:32 AM   #9
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yeah, if it's acting strange then try going back to a known working incandescent bulb.

On my '97 international I changed the Wait To Start bulb to an LED. Now it throws a code because the computer assumes the bulb is dead
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Old 02-06-2019, 06:39 AM   #10
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For my case I'm going to try a resistor to see if I can satisfy the computer. I really like how bright the WTS LED light is
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