MAG255 Measurement Card

This is the quick live-reading card for the highest-value MAG255 crater-fill, discharge-path, and spool-gun branch splits.

Use This Card When

wire creeps after stop
the spool gun will not weld
sparks appear at the wire tip without trigger

Prove First

correct base-gun setup with plain-steel wire
correct polarity and lead placement
base gun proven healthy before spool-gun proving

Fast Measurement Card

Checkpoint	Where to measure or observe	Healthy expectation	If abnormal, keep diagnosis in...
Spool-gun pins `1` and `9`	connector pins with spool-gun branch selected	welding voltage present only in the correct branch	spool-gun control or accessory branch
Post-trigger stop behavior	wire behavior after trigger release	wire stops cleanly	crater-fill branch
Wire-tip behavior with no trigger command	torch tip with no switch closure	no unexpected spark or discharge	discharge-path resistor branch
Base gun versus spool gun	compare base gun to spool gun	base gun proves first, spool-gun complaint stays isolated	spool-gun and drive-roll branch

Official Parts Shortcuts

Use these only after the readings prove the complaint follows the external gun, spool-gun, or drive-roll branch.
MAG255 parts category: official parts path
SpoolKing24D spool gun 07NS1000: official product page
U-groove aluminum drive roll 07000302: official product page

Stop Rules

Stop and isolate crater-fill first if wire creeps after stop.
Stop and keep the diagnosis external if the base gun is healthy and only the spool gun fails.
Stop using the card and open the full guide if stop behavior, discharge, and spool-gun branches do not align to one clear path.

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