Hey all,
I replaced instrument cluster type 94 bulbs with LED green ones. Initially none of them worked. I played with the seat for them in the back of the cluster and tried different bulbs. I have 3 of 4 of them working. Also with the vehicle in acc or on with the light selector in the off position those three bulbs are on. Any ideas what might cause this? Should I just take it all back apart and spray the bejesus out of it with electric cleaner?
Thanks for your time.

Most of these LED bulbs are sensitive to polarity. Have you tried removing them, turning them by 180 degrees and putting them back in?

I've done the same thing on all my Jags and they only time they've not worked is when I've put them in the wrong way round - it's always trial and error...

I have tried putting bulbs in both directions. Is it probable the fly overs (I think I've read them as being called) are just not making good contact anymore? On the LEDs that you installed did they come on with the key in on position or vehicle turned on with the light selector on off? If so is it just because it's getting some residual power that wouldn't be enough to light up a halogen but enough for an led? Thank you for your time.

I don’t know if it’s related but…

I had a couple of dead bulbs in the XJR that I asked my mechanic to replace last fall. He took the cluster out and put in new bulbs three times only to have them fail each time the cluster was reconnected.

He’d started with a package of 8 new bulbs so with the last two he disconnected the battery before reinstalling the cluster. Four months later they are still working fine including responding to the dimmer.

sorry for late response. after some time of having just left them as is they started flickering (bad seating of the neo wedges likely) 1998 plastic in an environment that gets extreme weather like 110f summer time -30 winter time. I believe the issue to be the neo wedges that the bulbs sit into. I have a package of new T10 neo wedges that I was going to try, just haven't had the time as I'm closing on a house and a whole other mess of time consuming responsibilities and what have you. these are what I ordered, I will be sure to update the thread after I move into this house and get It in the garage for winter.

Partsam T10 194 168 LED Dash Instrument Light Bulbs Green with Twist Lock Socket, Super Bright T10 Instrument Panel Gauge Cluster Dashboard Lights Bulbs 12V 6-2835-SMD LED Chipset, 10Pcs/Set https://a.co/d/7WYiyx8

***UPDATE***
Still haven't had a chance to put these in. however I have a different thread going as I randomly started having issues with taillights. I tried a hard reset to reset the BPM and have not had any flickering T-10 dash lights since. the one I prior mentioned as not working is still not working (I'm still thinking a bad neo wedge)

This one

those look pretty long. safer to Go with shorter ones so you know they'll fit in the instrument cluster.
the ones you listed are 23mm tall. the ones I listed are 17mm tall.

I'm using them they work fine on my 2001 xj8 not sure what model your car

1998 vanden plas. they weren't too long? awesome because that was a concern of mine lol