Yep, all 6 need to be filled. I fought chip issues for over a YEAR trying to figure out why I would have intermittent problems with the chip not waking up. Fill all 6 and I'm sure your troubles will disappear.
By the way, it has to do with the way the chip boots in certain positions regardless of where the switch is oriented at the time.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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