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Troubleshooting a '75 Cardinal 177RG sim I've tweaked for years. Its instrument lighting has become a real challenge; some gauges backlight correctly while others with the same type (generic or legacy) settings and overlay treatments don't. I have a single bus electrical system with 31 amp base load, single instrument lighting rheostat (0) which functions correctly on instruments which do backlight. "Dark' instruments are linked to the same bus through the same rheostat. Generic example: my generic, multi-rotary dual needle FF/MP gauge (with backlit base layer and backlit pointers) works perfectly. However a generic rotary version of the VSI done with the same photoshop layer editing (base layer saved with alpha, overlays flattened) won't backlight. Legacy Example: the legacy Turn and Slip indicator overlays backlight correctly, set to additive and tied to bus 1 with knob 0. The legacy (VVI_2000_GA) VSI from the XP 172 is too - but while it works fine on the 172, it won't backlight on my 177RG. The standard XP altimeter and the airspeed indicator have the same problem. Generic rotary bugs I've made for these do light up - the gauges stay dark. I've perused the wiki and other online resources, and have tried editing and resaving base layers with alpha, overlays flattened. I'm now out of ideas, and would appreciate further hints or troubleshooting links. FYI, I have some "glass" instruments including the 430 and AI/HSI (trying to replicate my Aspen) which all light up, but I don't know what their connections to other instrument lights could possibly be.
