Led dash light issues

[Tex06]

Replaced most of my dash lights with LEDs. Love the way it looks but my shift up light is constantly on now. Not bright, but very dim. When I need to shift it gets brighter like it should. Figure I have a bad ground, any idea where to start?

 

Pics kinda suck because bumpy road and night shot

 

Dim:

 

Bright:

 

Bright but pothole, lol:

 

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[DirtyComanche]

If there's one thing I'd pull the bulb out of, it's that...

[gogmorgo]

Lol @ bright but pothole.

 

Is there a chance that your new LED gauge lights are so bright they're bleeding into the upshift light? I would think that if that's the case, it would only come on dimly if when the lights are on, but I'd also expect a little bleed to the other lights in that panel too if that was the case. Could also be a random bulb holder for a feature you don't have but that is still in the wiring harness, or a bulb holder that came loose from where it's supposed to be as well I suppose.

[Steve Gregory]

I replaced the lights in my dash with led's, no problem yet. That is odd though

[Tex06]

Lol @ bright but pothole.

 

Is there a chance that your new LED gauge lights are so bright they're bleeding into the upshift light? I would think that if that's the case, it would only come on dimly if when the lights are on, but I'd also expect a little bleed to the other lights in that panel too if that was the case. Could also be a random bulb holder for a feature you don't have but that is still in the wiring harness, or a bulb holder that came loose from where it's supposed to be as well I suppose.

Light is still on when other dash lights are off. :/

 

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[64 Cheyenne]

Yup, I always pull the upshift light, it doesn't know what it's doing.....It lies.

You could have a bad upshift switch (vacuum maybe?), although that is one MJ thing that I don't know if there is one, how it works, or where it's at....

[HOrnbrod]

Was the upshift lamp operating normally before you changed the dash lights to LEDs? If so somehow the LED swap has added a ground loop causing the lamp to illuminate w/o input from it's sensor. Maybe by reversed polarity of one of the LEDs providing a ground path.  Did you try plugging the upshift LED in by rotating it 180*. If that doesn't work I'd just pull it to avoid other possible ground loops in the cluster.

[mikekaz1]

or return just that one upshift light to incandescent again

[Tex06]

Was the upshift lamp operating normally before you changed the dash lights to LEDs? If so somehow the LED swap has added a ground loop causing the lamp to illuminate w/o input from it's sensor. Maybe by reversed polarity of one of the LEDs providing a ground path.  Did you try plugging the upshift LED in by rotating it 180*. If that doesn't work I'd just pull it to avoid other possible ground loops in the cluster.

 

 

Yep, operated normally beforehand.  LED is in properly, doesn't work (diode!) if installed backwards.  If I pull the dash again to do the bright light indicator and turn signals, I'll pull all the unused LEDs and see if there is a possible "hot" current being passed to the upshift bulb at all times.

 

 

or return just that one upshift light to incandescent again

 

Not worth buying a bulb for, plus it's waaaayyyy cooler that it's green instead of that annoying yellowish-puke color.  

[Tex06]

Yup, I always pull the upshift light, it doesn't know what it's doing.....It lies.

You could have a bad upshift switch (vacuum maybe?), although that is one MJ thing that I don't know if there is one, how it works, or where it's at....

 

 

I like this idea.  I should be able to test for any voltage at the lamp and then if anyone can point me to the switch or pin on the ECU, I can backprobe it. :D

[HOrnbrod]

LED is in properly, doesn't work (diode!) if installed backwards.  If I pull the dash again to do the bright light indicator and turn signals, I'll pull all the unused LEDs and see if there is a possible "hot" current being passed to the upshift bulb at all times.

Yes, of course an LED by itself is a diode, but some of the newer (more expensive) LED bulbs have built-in bridge rectifiers and will operate regardless of polarity.

[Tex06]

 

LED is in properly, doesn't work (diode!) if installed backwards. If I pull the dash again to do the bright light indicator and turn signals, I'll pull all the unused LEDs and see if there is a possible "hot" current being passed to the upshift bulb at all times.

Yes, of course an LED by itself is a diode, but some of the newer (more expensive) LED bulbs have built-in bridge rectifiers and will operate regardless of polarity.

Mine are the cheap Chinese ones! Hadn't seen the ones with a rectifier....that's a pretty spiffy idea! (Took a lot of EE classes in college then did several years as a electronics tech)

 

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