Repairing The Guide Matic in a 63 Cadillac (Final part)

sorry the camera cut in the last video, the battery died so I had to wait a few hours before I recorded this and forgot where I left off

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First tube is simply a ballast, if open you'd lose ability to select hi-beam. Test the other tube as a 12K5. There is a 100uF electrolytic cap, and likely several carbon composition resistors you will want to replace to restore proper operation. This is of course followed by final adjustment as per the Guide instructions.