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If your wiring diagram is hard to read without a magnifying glass, you can go to an office supply store and have them blow it up as large as possible & print out a color copy. Then, you'll actually be able to read it!

I also had them laminate mine. Total cost was about $10 at Staples and that was for two copies.

I use overhead projector pens to draw on it when needed. You can wet a paper towel to wipe it clean for your next troubleshooting session. (Dry erase markers aren't good for garage work.)