Assuming you mean the Electromatic clutch manual for 19th & 20th series from Oct 46,
https://packardinfo.com/xoops/html/modules/article/view.article.php?45, that is probably as good as you'll find. There are some procedures in Motors manuals but probably not as detailed.
Assuming yours has the 8 terminal relay box, looking at the first step to connect the light to BA and LR, I would suspect the switch. To rule out the other things you mentioned, disconnect the wire from LR and connect the light to BA & the wire only. That just leaves the switch in the circuit and if it still fails, then it's bad or needs adjusting or wire is shorted.
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=34142