No Dash Lights

Have been in the brick camp for 16 years and over 100,000 miles. It is too big, too heavy, too tall and I am too old. Traded for a 1975 R-75/6 that has not run for 20 maybe 25 or it could be 30 years. I have drained and cleaned all that is proper to get it ready to start. Put in a fresh battery and turned the key. No dash lights, no telltale lights no speedo or tac lights. I went to the ignition switch and it had power. I then attempted to start it and it fired right up. I only let it run a few seconds because it didn't have an oil pressure light. I have since determined to all the other lights work. Only the lights in the the instrument pod don't work.
Question 1 Has this happened to any of you and is there any remedy that is simple. Question 2 Is there a wiring diagram that is better then the owners manual or the factory manual than can be read without a magnifying glass. Thanks for any advice

Harold -

If it started, then that suggests that the starter relay is working and the kill switch is in the right position. I would suspect the square plug that connects into the back of the speedo pod might have some corrosion on the pins. There are a few bolts that hold the pod onto a stalk on the front yoke...then you'll see a small phillips screw head on the back of the pod. Remove that and work the square plug off/on a few times. Look inside the connector ends to be sure there's no corrosion.

As for diagrams, consider some that are in the Wiring Diagrams part of this link:

https://forums.bmwmoa.org/showthread.php?47142-Resources-and-Links

Thanks for the reply. I had run a search of the forum with no results. After I entered my post I see similar posts at the bottom of the page. I see it is a common problem. Everything points to the problem being the pod or in the pod, so that is where I am going next. will report.