88 GL10 wagon, EJ22 swap. The problem I have is the backlights in the dash quit functioning. When the headlights are on the trip computer goes dark (the numbers still display, you just can't see them)and the cluster lights don't come on. (odometer and trip odometer etc)The digital instruments all work fine. I checked and my tail lights work normally. I'm not where my manual is for a schematic to look at and I have searched some without coming up with anything. I suppose it is possible that I disturbed something doing the EJ swap but the dashlights worked normal for probably 10k miles after the swap. Any ideas where I should look? Thanks!

I swapped out the dimmer switch for the dash lights and everything got normal. It would appear the L.E.D's and the incandescents have a separate rheostats.