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Q: more off than on,no heads up display. Defrost comes on. I want to know my speed. on 1992 Cadillac Seville STS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Please DO NOT tell me it's a groundng issue, unless you have specific areas for me to check. I have the wiring diagrams, and have even spliced into the ground wires from the display panel and the passenger side ecu (and ran directly to ground), I've replaced the alternator, reworked the grounding points on both sides of the nose of the car, replaced fuses (and the breakers... yes, breakers), and have wire brushed the power bar in the front power fuse and relay center, but still have the same issue. The display only works on start up, AFTER it has been parked on a slight up hill, and slight tilt to the right. To me, this makes it seem as though it's a power supply issue. It will then go out again once I start driving, or not.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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